DREB2018 – 10th
International Conference on
Direct Reactions with Exotic
Beams
Monday 04 June 2018 - Friday 08 June 2018
MatsueReport of Abstracts/event/2536/

DREB2018 – 10th International Conference on Direct Reactions with E … / Report of Abstracts

45

A Particle-Rotor Model Description of 29F *Author(s): Augusto Macchiavelli1 ; Heather Crawford1 ; Paul Fallon2
Co-author(s): Chris Campbell 1 ; I-Yang Lee 1 ; Marco Salathe 1 ; Mario Cromaz 1 ; Michael Jones 1 ; Roderick Clark

1

1

Lawrence Berkeley National Laboratory

2

Lawrence Berkeley Laboratory

Corresponding Author(s): cmcampbell@lbl.gov, aom@lbl.gov, rmclark@lbl.gov, hlcrawford@lbl.gov, iylee@lbl.gov,
pfallon@lbl.gov, msalathe@lbl.gov, mdjones@lbl.gov, mcromaz@lbl.gov

Recent results from RIKEN/RIBF on the low-lying level structure of 29F, and state of the art Shell
Model calculations using the SDPF-M effective interaction [1], suggest the extension of the N=20
Island of Inversion to the Z=9 Fluorine isotopes.
In this work we discuss the low-lying excitation spectrum of 29F in terms of a collective picture[2], with a level structure corresponding to the rotation-aligned coupling limit of the Particle Rotor
Model (PRM) [3].
The Coriolis coupling effects on the proton d5/2 Nilsson multiplet give rise to a (favored) decoupledband, with its 5/2+ bandhead naturally emerging as the ground state. The first excited state corresponds to the anti-aligned 1/2+ configuration at an energy that depends directly on the core E(2+).
We find a consistent solution at a deformation of ε ~ 0.17, corresponding to an excitation energy ofthe 2+ in 28O at ~2.4 MeV, in line with the conclusions reached in Ref. [1].
PRM predictions for some spectroscopic observables will also be presented and discussed in the context of a Coulomb Excitation experiment approved at RIKEN [4]. If similar energetics and coupling
conditions persist, a πd5/2 x νf7/2 double-decoupled structure in 30F is predicted with a 6- groundstate.
• This work is supported by the U.S. Department of Energy, Office of Nuclear Physics, under contract no DE-AC02-05CH11231.
[1] P. Doornenbal, et al., Phys. Rev. C95, 041301(R) (2017).
[2] A. O. Macchiavelli, et al., Phys. Lett. B775, 160 (2017).
[3] F. S. Stephens, Rev. Mod. Physics , 47, 43 (1975).
[4] H. L. Crawford, et al., RIBF164 proposal (2017).

61

A new scattering chamber for conducting precision experimentson the heavy-ion reaction cross sections at the accelerator DC-60(Astana, Kazakhstan) at low energies
Author(s): Aidos Azhibekov1 ; Asset Kabyshev1 ; Kairat Kuterbekov2 ; Kairat Mendibayev1 ; Sergey Lukyanov3 ;Yuri Penionzhkevich3
Co-author(s): Aisulu Mukhambetzhan 4 ; Bakhtiyar Sadykov 5 ; Ergazy Kenzhin 5 ; Igor Ivanov 5 ; Mikhail
Koloberdin 5 ; Rita Alina 1 ; Vladimir Maslov 3 ; Yernar Orda 6 ; Yuri Sobolev 3
1

L. N. Gumilyov National University

2

L.N.Gumilyov Eurasian National University

3

G. N. Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research

4

Korkyt-Ata Kyzylorda State University

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5

Institute of Nuclear Physics

6

L. N. Gumilyov National Universit

Corresponding Author(s): koloberdinm@inp.kz, kayrat1988@bk.ru, azhibekoaidos@mail.ru, aisulumuhankyzy@mail.ru,
kenzhinea@inp.kz, ordayernar@gmail.com, sobolev@nrmail.jinr.ru, lukyan@nrmail.jinr.ru, pyuer@mail.ru, assetenu@gmail.com,
alina_rita@mail.ru, kkuterbekov@gmail.com, b.sadykov73@gmail.com, maslov_vova@mail.ru, ivanovi@inp.kz

Within the framework of the long-term program of cooperation between JINR, ENU and Instituteof Nuclear Physics (INP), joint experiments connected with the peculiarities of the interaction oflithium nuclei (6-9,11Li) at energies near the Coulomb barrier will be conducted on the U-400M
cyclotron of G.N. Flerov Nuclear Reaction Laboratory (FLNR JINR) and on the DC-60 accelerator(Astana) of the INP. To obtain new experimental information on the properties of weakly bound(cluster and exotic) lithium nuclei (the entire chain of lithium isotopes) and their manifestation ininteraction with other nuclei, the features of the angular distributions of elastic and inelastic scattering cross sections, the energy dependences of the total reaction cross sections (σR(Е) and crosssections of individual dominant reaction channels; the corresponding reaction mechanisms in thepreviously unexplored region of energy will be studied.
Experiments in Astana (Kazakhstan) are supposed to be carried out at the DC-60 using a new scattering chamber and corresponding detector systems and nuclear electronics, which was manufactured
at the FLNR JINR. The new dispersion chamber for the DC-60 is a completely new modern installation, which includes a new electronic system for collecting and processing experimental information
FASTER.
Control experiments using the new camera will be conducted on beams 6,9,11Li at the FLNR JINR
and on 7Li nuclei – on the DC-60. These nuclei (6,7,9Li) have a weakly bound cluster structure, andthe 11Li nucleus is an exotic nucleus with a very low binding energy (Ebind = 0.3 MeV). In such
experiments, we are expected to detect the features of their manifestation in nuclear reactions near
the Coulomb barrier: subbarrier fusion, an increase in the cross section for cluster transfer reactions, features in the angular distributions of elastic and inelastic scattering, and features in σR(Е.
The obtained information is of great importance for fundamental nuclear physics and in other fields
of science, for example, for describing the scenario of nucleosynthesis in astrophysics.

2

Ab initio translationally invariant nonlocal one-body densities
Author(s): Michael Gennari1
Co-author(s): Angelo Calci 1 ; Matteo Vorabbi 1 ; Petr Navratil 1
1

TRIUMF

Corresponding Author(s): navratil@triumf.ca, calci@triumf.ca, mvorabbi@triumf.ca, mgennari5216@gmail.com

Nonlocal nuclear density is derived from the no-core shell model (NCSM) one-body densities bygeneralizing the local density operator to a nonlocal form. The translational invariance is generated
by exactly removing the spurious center of mass (COM) component from the NCSM eigenstates
expanded in the harmonic oscillator (HO) basis. The ground state local and nonlocal density of\textsuperscript{4,6,8}He, \textsuperscript{12}C and \textsuperscript{16}O are calculated to display
the effects of COM removal on predicted nuclear structure. This enables the ab initio NCSM nuclear
structure to be used in intermediate energy nuclear reactions. We include the nonlocal density incalculations of optical potentials and show more accurate theoretical predictions for the differential
cross sections of proton scattering off of stable and exotic light nuclei.

118

Constraining the 30 P(p,γ)31 S Reaction Rate, via a Measurement of
the 32 S(p,d)31 S* Reaction
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Author(s): K.A. Chipps1 ; R.O. Hughes2 ; Sean Burcher3
Co-author(s): A. Saastamoinen 4 ; A. Simon 5 ; C. Reingold 5 ; H. Clark 4 ; H. Jayatissa 4 ; J. Burke 2 ; J. Hooker 4 ;J.A. Cizewski 6 ; J.M. Allmond 1 ; K. Schmidt 7 ; K.L. Jones 3 ; N. Cooper 5 ; S. Ahn 4 ; S. Ota 4 ; S. Upadhyayula 4 ;S.D. Pain 1
1

Oak Ridge National Laboratory

2

Lawerence Livermore National Laboratory

3

University of Tennessee Knoxville

4

Texas A&M University

5

University of Notre Dame

6

Rutgers University

7

Joint Institute for Nuclear Astophysics - Center for the Evolution of the Elements

Corresponding Author(s): joshhooker@tamu.edu, shuyaota@exchange.tamu.edu, stevenpain@nuclearemail.org,
clark@comp.tamu.edu, anna.simon@nd.edu, cizewski@physics.rutgers.edu, hesh@tamu.edu, sburcher@vols.utk.edu,
craig.s.reingold.1@nd.edu, ncooper3@nd.edu, burke26@llnl.gov, sriteja@tamu.edu, kgrzywac@utk.edu, ajsaasta@comp.tamu.edu,
sainttonian@gmail.com, jmallmond@gmail.com, schmidtk@nscl.msu.edu, hughes61@llnl.gov, kchipps@nuclearemail.org

Accurate modeling of classical nova nucleosynthesis is fundamentally dependent on the thermonuclear reaction rates of the nuclei involved. In particular it has been shown that the 30 P(p,γ)31 S
reaction rate is the largest source of uncertainty in the final abundance of nuclei created in a classical nova, involving an ONe white dwarf. The calculation of the 30 P(p,γ)31 S reaction rate, at nova
temperatures, requires knowledge of the spin and parity assignments and partial widths of the levels
in 31 S just above the proton threshold. To obtain the relevant nuclear data, a measurement of the
32
S(p,d)31 S* reaction has been performed at the Texas A&M Cyclotron Institue using a proton beamfrom the K150 cyclotron and a target consisting of ZnS deposited on a thin carbon backing. The
newly commisioned, high-efficiency, particle-gamma array, Hyperion, was used in a configuration
with 12 HPGe clover detectors and a dE-E telescope of segmented annular silicon detectors downstream of the target position for the detection of direct reaction products. In addition, a single silicondetector was placed upstream of the target for the detection of decay protons. Initial results fromthe experiment will be presented.
\\\\
This material is based upon work supported by the U.S. Department of Energy, Office of Science,
Office of Nuclear Physic under contracts DE-FG02-96ER40983 (UTK), DE-AC05-00OR22725 (ORNL),
DE-NA-0003780 (Notre Dame), DE-AC52-07NA27344 (LLNL), and DE-FG03-93ER40773 (TAMU), withadditional support from The Welch Foundation, The National Science Foundation under PHY-1430152(JINA-CEE), and the Laboratory Directed Research and Development Program of Oak Ridge National
Laboratory.

135

Cooled BGO array detector for experiments at JUNA
Jun Su1
1

China Institute of Atomic Energy

Corresponding Author(s): junsufan@foxmail.com

Jinping Underground lab for Nuclear Astrophysics (JUNA) is designed to directly measure the crosssections of crucial reactions during the evolution of hydrostatic stars. The extremely low crosssections of radiative capture reactions within their relevant Gamow peaks require a gamma detector
with high detection efficiency. For this reason, we have constructed a 4π BGO array detector composed of eight crystals with a length of 250 mm and a radial thickness of 63 mm. In order to improvethe energy resolution of the BGO array detector, all the crystals are cooled to -20 degrees Celsius.
An energy resolution <11% is observed for the 661 keV gamma ray.

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DREB2018 – 10th International Conference on Direct Reactions with E … / Report of Abstracts
28

Coulomb shift in two-center mirror nuclei
Author(s): Makoto Nakao1
Co-author(s): Hajime Umehara 2 ; Makoto Ito 3 ; Shuichiro Ebata 4
1

Kansai university

2

Department of Physics, Osaka University

3

Department of Pure and Applied Physics, Kansai University

4

Faculty of Science, Hokkaido University

Corresponding Author(s): itomk@kansai-u.ac.jp, k567240@kansai-u.ac.jp, umehara@valk.phys.sci.osaka-u.ac.jp,
ebata@nucl.sci.hokudai.ac.jp

The so-called alpha cluster structure appears in the excited states of light nuclear system, and thestructures have been extensively investigated in the N=Z systems. Furthermore, the alpha cluster
structures are also discussed in neutron-excess (N>Z) systems extensively.
In the present report, we focus on the mirror systems, which are obtained by replacing neutrons toprotons in neutron-excess system, and demonstrate that the Coulomb shift of the mirror systems is
a new probe to catch the sign of the clustering phenomena. Here we discuss the Coulomb shift ofthe mirror systems, such as (18O = alpha + 14C) - (18Ne = alpha + 14O).
The interaction potential of alpha and the residual nucleus is derived from the double folding (DF)model with the effective nucleon-nucleon interaction of the density-dependent Michigan 3-range
Yukawa. The validity of the DF potential is checked by applying it to the alpha + 14C elastic scattering. The scattering calculation with the DF potential nicely reproduces the observed differential
cross sections.
The energy level of these mirror systems are calculated from the orthogonality condition model(OCM), in which the functional space allowed by the Pauli’s exclusion principle is exactly constructed. Here we have constructed the Pauli’s allowed space by employing the mathematical technique of the SU(3) group representation in nuclei. The resonant 0+ levels and their decay width are
identified by imposing the absorbing boundary condition. Above the alpha decay threshold, two
resonant 0+ states are obtained, which seem to be consistent to the recent observations of the alpha+ 14C elastic scattering and the multi-nucleon transfer reaction.
We have evaluated the energy shift of the 0+ states in the mirror systems of 18O - 18Ne, which arises
from the difference of the Coulomb interaction. The OCM calculation predicts that the Coulomb shift
for the resonant 0+ states is prominently reduced in comparison to the shift for the low-lying boundstates. This reduction of the Coulomb shift for the resonant 0+ state is induced by the developmentof the alpha clustering. Therefore this result strongly suggests that the Coulomb shift is new probe
to identify the cluster degrees of freedom.
In this report, we will discuss the relation of the reduction of the Coulomb shift and the developmentof the cluster degrees of freedom in detail.

52

Decay mode of the linear-chain states in C isotopes
Author(s): Tomoyuki Baba1
Co-author(s): Masaaki Kimura 1
1

Hokkaido University

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Corresponding Author(s): masaaki@nucl.sci.hokudai.ac.jp, baba@nucl.sci.hokudai.ac.jp

Recent years have seen many important experimental studies for the linear-chain states (linearlyaligned 3α particles) in 14C and 16C.
These new data motivated us to perform an analysis and to summarize the calculated and observed
properties of the linear-chain bands in carbone isotopes.
In this presentation, the linear-chain states of 14C and 16C and their decay modes are theoreticallyinvestigated by using the antisymmetrized molecular dynamics. It is found that the positive-parity
linear-chain states have the molecular orbit configuration and primary decay to the 10,12Be(2+ 1 )as well as to the 12Be(g.s.) by the α particle emission.
Moreover, we show that they also have 6He decay widths.
Their α and 6He reduced widths are sufficiently large to be distinguished from other non-cluster
states.

136

Development of the gaseous Xe scintillation detector for the particle identification of high intensity and heavy RI beams
Author(s): Harutaka Sakaguchi1 ; Juzo ZENIHIRO2 ; Satoru Terashima2 ; Tomoya Harada3 ; Yohei Matsuda4
Co-author(s): Keita Kawata 5 ; Koki Kasamatsu 4 ; Masanori Dozono 6 ; Shinsuke Ota 7 ; Shunya Ishida 8
1

Research center for Nuclear Physics

2

RIKEN Nishina Center

3

Toho univ.

4

Cyclotron and Radioisotope Center, Tohoku University

5

University of Tokyo(CNS)

6

Center for Nuclear Study, the University of Tokyo

7

Center for Nuclear Study, University of Tokyo

8

Cyclotron and Radioisotope Center, Tohoku university

Corresponding Author(s): sakaguti@rcnp.osaka-u.ac.jp, keita-kawata@cns.s.u-tokyo.ac.jp, tomoya.harada@riken.jp,
shunya611@cyric.tohoku.ac.jp, ota@cns.s.u-tokyo.ac.jp, tera@ribf.riken.jp, juzo@ribf.riken.jp, kasamatsu@cyric.tohoku.ac.jp,
dozono@cns.s.u-tokyo.ac.jp, matsuda@cyric.tohoku.ac.jp

For the experiments of unstable nuclei, the cocktail RI beams produced by the fragmentation of HI
beams are often used. It is necessary to identify the RI beam event by event RIBF can provide thehigh intense RI beam, but we cannot fully utilize it due to the radiation damages of the existing
detectors for the particle identification. To get enough data efficiently in a limited time, we need
new detectors which have a good radiation hardness, a fast timing response, and a good energy andtiming resolution.
For this purpose, we have developed a new detector employing the scintillation of the gaseous Xe.
Since Xe gas is known to have a small work function,a high energy resolution is expected. However,the scintillation properties of the gaseous Xe from high-energy and –intensity HI particles not fully
understood so far.
In order to evaluate the performance of the gaseous Xe scintillation detector, we tested it with a
primary beam of 132Xe 290Mev/u and a secondary beam of A/Z ~2.28 at 300MeV/u produced by
132Xe 400MeV/u at Heavy Ion Medical Accelerator in Chiba in Nov.2017. I will report the result of
this experiment in this conference.

53

Effect of Tensor Force on Proton Shell Evolution in the ”SouthWest” of 132Sn: Low-Lying -emitting Isomers in 123,125Ag
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Zhihuan Li1
1

Peking University

Corresponding Author(s): zhli@pku.edu.cn

The beta-delayed gamma-ray spectroscopy of 123,125Pd are investigated at the Radioactive Isotope
Beam Factory of the RIKEN Nishina Center. Neutron-rich nuclei 123,125Pd are produced by inflight fission of the 238U beam at 345 MeV/nucleon. The 1/2− low-lying beta-emitting isomers in
123,125Ag and gamma transitions feeding into the isomers are constructed for the first time andthe results are compared to large-scale shell-model calculations using the state-of-the-art EPQQM
effective interaction. The effects of the monopole interaction on the proton shell evolution in the“southwest” of 132Sn are discussed in terms of Vmu interaction.

18

Fragmentation of carbon on elemental targets at 400 A MeV
Author(s): Dong-Hai Zhang1
Co-author(s): Jun-Sheng Li 1 ; Satoshi Kodaira 2
1

Institute of Modern Physics, Shanxi Normal University

2

Radiation Measurement Research Section, National Institute of Radiological Sciences

Corresponding Author(s): zxyljs@126.com, koda@nirs.go.jp, zhangdh@sxnu.edu.cn

The total charge-changing reaction cross-sections and the partial cross-sections of projectile fragments(PFs) production for the fragmentation of 12C on C, Al, Cu, Pb and CH2 targets at the highest
energy of 400 A MeV are investigated. It is found that the total charge-changing cross-sections
and the partial cross-sections of PFs production for the fragmentation are independent of the beamenergy, and increase with increase of mass of target for the same beam energy. The total chargechanging reaction cross section is the same as the prediction of Bradt-Peters semi-empirical formula,
PHITS and NUCFRG2 models. The partial cross section of PFs production increases with the increaseof the mass of target, and it is the same as the prediction of NUCFRG2 model. The average scattering
angle of beam particle is less than the mean emission angle of PF, and the width of scattering angle
distribution of beam particle is less than that of emission angle distribution of PF. The mean emission
angle of PF increases with the mass of target for the same beam energy and charge of PF.

125

Investigation of 198,200Hg isotopes
Author(s): Alejandra Diaz Varela1
Co-author(s): A.J. Radich 1 ; A.T. Laffoley 1 ; A.T. MacLean 1 ; B. Hadinia 1 ; B. Jimeddorj 1 ; B. Rebeiro 2 ; C.
Burbadge 1 ; C.E. Svensson 1 ; D.S. Jamieson 1 ; E.T. Rand 1 ; G.C. Ball 3 ; H.-F. Wirth 4 ; K.G. Leach 5 ; P.E. Garrett 1 ;R. Hertenberger 4 ; S. Triambak 2 ; T. Faestermann 6 ; V. Bildstein 1
1

University of Guelph

2

University of the Western Cape

3

TRIUMF

4

Ludwig-Maximilians-Universitat Munchen

5

Colorado School of Mines

6

Technische Universitat Munchen

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Corresponding Author(s): ball@triumf.ca, evanrand@gmail.com, striambak@uwc.ac.za, thomas.faesternabb@mytum.de,vbildste@uoguelph.ca, adiazvar@uoguelph.ca, sven@uoguelph.ca, garrettp@uoguelph.ca, hans-friedrich.worth@physik.unimuenchen.de, aradich@uoguelph.ca, b.rebeiro@gmail.com, bjigmedd@uoguelph.ca, amacle02@uoguelph.ca, baharak.hadinia@googlemail.com, kleach@mines.edu, cburbadg@uoguelph.ca, alex.laffoley@gmail.com, rald.hertenberger@physik.unimuenchen.de, andrew.jamieson@stonybrook.edu

The observation of a large permanent electric dipole moment (EDM) would represent a clear signalof CP violation from new physics outside the Standard Model. The 199Hg isotope currently provides
the most stringent limit on an atomic EDM, which is converted to a limit on the nuclear EDM via
a calculation of the Schiff moment, requiring knowledge of the nuclear structure of 199Hg. Ideal
information to further develop and constrain the 199Hg Schiff moment nuclear structure theoreticalmodels would be the E3 and E1 strength distributions to the ground state, and E2 transitions amongst
excited states. The high level density of 199Hg makes those determinations extremely challenging,
however similar information can be obtained from exploring surrounding even-even Hg isotopes.
One of the most direct ways of measuring the E3 and E2 matrix elements is through inelastic hadronscattering, and single-nucleon transfer reactions on targets of even-even isotopes of Hg can yield
important information on the single-particle nature of 199Hg.
As part of a campaign to study the Hg isotopes, a number of experiments have been performed
using the Q3D spectrograph at the Maier-Leibnitz Laboratory, with 22 MeV deuteron beams impinging on enriched Hg32S targets. The first set are inelastic deuteron scattering experiments,
198Hg(d,d’)198Hg and 200Hg(d,d’)200Hg. Deformation parameters were extracted through coupledchannel calculations with global optical-model potential (OMP) parameter sets for 200Hg. The second set of experiments were single-nucleon transfer reactions, 198Hg(d,p)199Hg and 200Hg(d,t)199Hg,
with spin-parity assignments and spectroscopic factors extracted through distorted-wave Born approximation calculations with global OMP sets. Highlights of the results for the four experiments
will be presented.

42

Investigation on alpha clustering via knockout reaction
Author(s): Kazuki Yoshida1
Co-author(s): Kazuyuki Ogata 1 ; Yoshiko Kanada-En’yo 2
1

RCNP, Osaka University

2

Kyoto University

Corresponding Author(s): kazuyuki@rcnp.osaka-u.ac.jp, yenyo@ruby.scphys.kyoto-u.ac.jp, yoshidak@rcnp.osakau.ac.jp

The alpha clustering has been one of the main interest in nuclear physics. In order to probe the alphaclustering through reaction observables, the proton-induced alpha knockout reaction, (p,p alpha), is
considered in this study. The purpose of this work is to reveal how the alpha cluster amplitude isprobed through the (p,p alpha) reactions.
Within the distorted wave impulse approximation (DWIA) framework, We have newly introduced
the “masking function” which defines the probed region of the alpha cluster amplitude through the(p,p alpha) reactions. It has been clearly shown by means of the masking function that the alphaknockout reaction probes the alpha cluster in the nuclear surface, which will be the direct measureof well-developed alpha cluster states. A simplified form of the masking function is also introduced
and the incident energy dependence of the masking effect is investigated.
As a conclusion, alpha knockout reaction can be the probe for the alpha cluster amplitude in the
nuclear surface owing to the masking effect originated from the absorption of distorting potentials,
and is a suitable method to investigate how alpha cluster states are spatially developed.

96

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DREB2018 – 10th International Conference on Direct Reactions with E … / Report of Abstracts

Isoscalar monopole and dipole transitions as a probe for cluster
states in 24Mg
Author(s): Yohei Chiba1
Co-author(s): Masaaki Kimura 1
1

Hokkaido University

Corresponding Author(s): masaaki@nucl.sci.hokudai.ac.jp, chiba@nucl.sci.hokudai.ac.jp

In this contribution, we will show that isoscalar monopole and dipole transitions are a good probe
for cluster states in 24Mg. The cluster states having significant influence on He- and Carbon-burning
processes such as 12C+12C and 4He+20Ne are expected in 24Mg according to Ikeda diagram. However, their existences are still ambiguous due to experimental and theoretical difficulties. In thisdecade, it was suggested that cluster states can be strongly populated by isoscalar monopole anddipole transitions. This means that unknown cluster states can be accessible by isoscalar monopoleand dipole transitions. Therefore, we will present antisymmetrized molecular dynamics calculation
results for 24Mg and reveal that relation between isoscalar monopole and dipole transition strengths
and cluster states of 24Mg. Furthermore, we discuss the p-, 4He- and 12C-decay widths of the excitedstates.

22

Maris polarization of neutron-rich nuclei
Author(s): Carlos Carlos Bertulani1
Co-author(s): Shubhchintak Shubhchintak 2 ; Thomas Aumann 3
1

Texas A&amp;M University-Commerce2

Texas A&M University-Commerce3

Technische Universitaet Darmstadt

Corresponding Author(s): carlos.bertulani@gmail.com, khajuria1986@gmail.com, t.aumann@gsi.de

I will discuss the Maris polarization effect and its application in quasi-free reactions to assess information on the structure of exotic nuclei. The uncertainties in the calculations of triple differential
cross sections and of analyzing powers due the choices of various nucleon-nucleon interactions the
optical potentials and limitations of the method are the main focus. Theoretical calculations explore a large number of choices for the nucleon-nucleon (NN) interactions and the optical potential
for nucleon-nucleus scattering and implies that polarization variables in (p,2p) reactions in inverse
kinematics can be an effective probe of single-particle structure of nuclei in radioactive-beam facilities.

93

Microscopic analysis of elastic scattering based on chiral g matrix
Author(s): Masakazu Toyokawa1
Co-author(s): Masanobu Yahiro 1 ; Michio Kohno 2 ; Takuma Matsumoto 1
1

Kyushu University

2

RCNP, Osaka University

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Corresponding Author(s): toyokawa@phys.kyushu-u.ac.jp, kohno@rcnp.osaka-u.ac.jp, yahiro@phys.kyushuu.ac.jp, matsumoto@phys.kyushu-u.ac.jp

We investigated the effects of three-nucleon force (3NF) from chiral effective field theory on nucleonnucleus (NA) and nucleus-nucleus (AA) elastic scattering by using g-matrix folding model. To clarify
the 3NF effects accurately, we constructed new g-matrix, so called chiral g matrix, from chiral twonucleon force and 3NF by using Bruckner-Hartree-Fock method and localized the g matrix in order toapply g-matrix folding model. In this conference, we will show the microscopic analysis with chiralg matrix reproduces the experimental data without introducing any adjustable parameter.

91

Microscopic optical potential obtained from energy-density-functional
approach for nucleon-nucleus elastic scattering
Author(s): Hao Tran Viet Nhan1
Co-author(s): Carlos Carlos Bertulani 2 ; Tung Nguyen Hoang 3
1

Department of Physics and Astronomy, Texas A&M University-Commerce, Commerce, TX 75429, USA

2

Texas A&amp;M University-Commerce

3

VNUHCM-University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh city, Viet Nam

Corresponding Author(s): carlos.bertulani@gmail.com, tran.viet.nhan.hao@gmail.com, nguyen.hoang.tung.13122@gmail.com

Nucleon-nucleus (NA) optical potentials are microscopically generated from a fully self-consistentframework of the particle-vibration coupling (PVC), in which the nucleon-nucleon (NN) effective
interaction of the Skyrme type is consistently used to describe the Hartree-Fock (HF) mean-field,
the small amplitude collective motions of the target, and the particle-collective states coupling. For
the first time, a systematic calculation of low-energy NA elastic scattering off a series of doubly
closed-shell nuclei is carried out without ad hoc adjusted parameters. Angular distributions obtainedusing the present optical potentials are in good agreement with the experimental data. This will bea major step forward in the applications of the Skyrme energy-density-functional theory to build up
the global microscopic optical potentials, which are expected to be a powerful tool for the study of
unstable (exotic) nuclei at low incident nucleon energies.

57

Microscopic optical potentials for nucleus-nucleus scattering basedon the Glauber model
Author(s): Shoya Ogawa1
Co-author(s): Masakazu Toyokawa 2 ; Ryo Horinouchi 2 ; Takuma Matsumoto 2
1

Kyushu university

2

Kyushu University

Corresponding Author(s): matsumoto@phys.kyushu-u.ac.jp, s-ogawa@email.phys.kyushu-u.ac.jp, toyokawa@phys.kyushuu.ac.jp, horinouchi@email.phys.kyushu-u.ac.jp

Recently, study on unstable nuclei near the neutron dripline has been attracted by the developmentof radioactive ion-beam experiments. The optical potential between a projectile and a target is a basic
ingredient to describe the elastic scattering. In the neutron-rich region, it is difficult to determine
the phenomenological optical potential due to restrictions on experimental data. Therefore, we needto construct the optical potential microscopically.

Page 9DREB2018 – 10th International Conference on Direct Reactions with E … / Report of Abstracts
The g-matrix folding model has been widely used as a reliable method to obtain the microscopic
optical potential. In the previous works, we proposed a double-single folding (DSF) model for 3He
and 4He scattering, in which the optical potential between 3,4He and a target is constructed byfolding the projectile density with a microscopic nucleon-target optical potential. The DSF model
well reproduces the experimental data without any adjustable parameter. However, the same approach does not work well for the case of unstable nuclei, since the DSF model neglects projectileexcitation effects that are important for reactions involving weakly-binding nuclei. The continuumdiscretized coupled-channels method (CDCC) can provide the framework to circumvent this shortcoming.
In our research, we propose a method to construct a microscopic optical potential including projectileexcitation effects by combining the DSF model with the Glauber model. In this conference, we willreport properties of the obtained potential, and discuss applicability to reactions involving unstable
nuclei.

97

Neutron-proton Pairing Correlations and Deformation for N = Z
Nuclei in sd, pf, gd-shell by the deformed BCS and HFB approach
Author(s): Eunja Ha1
Co-author(s): Hiroyuki Sagawa 2 ; Myung-Ki Cheoun 1
1

Soongsil University

2

RIKEN, Aizu University

Corresponding Author(s): sagawa@ribf.riken.jp, cheoun@ssu.ac.kr, eunhasky@hotmail.com

We investigated neutron-proton pairing correlations effects on the shell evolution of ground stateenergies by the deformation for N = Z nuclei in sd, pf, dg-shell. We started from a simple shellfilling model constructed by a deformed Woods-Saxon potential with β2 deformation, and included
pairing correlations in the residual interaction, which give rise to smearing of the Fermi surface revealing interesting evolution of the Fermi energy along the shell evolution. In this work, like-pairingand unlike-pairing correlations decomposed as isoscalar T = 1 and isovector T = 0 components
are explicitly taken into account. Finally, we estimate ground state energies comprising the mean
field energy, the pairing energy and the self-energy due to the pairing correlations, in terms of thedeformation.

134

Nuclear collective excitation within finite-amplitude method
Nobuo HINOHARA1
1

Center for Computational Sciences, University of Tsukuba

Corresponding Author(s): hinohara@ccs.tsukuba.ac.jp

Giant resonances provide us important information on nuclear collective properties. For the nuclear
density functional theory (DFT), the giant resonance will determine the coupling constants that are
not very well constrained from the ground-state properties. In order to assess the giant resonances
in a wide region of the nuclear chart, an efficient technique to compute the giant-resonance energy
is necessary for constraining the coupling constants in the nuclear energy density functional.
The quasiparticle random-phase approximation (QRPA) is a standard theory for describing various
kinds of small-amplitude collective modes including giant resonances based on the nuclear DFT. The

Page 10DREB2018 – 10th International Conference on Direct Reactions with E … / Report of Abstracts
widely used technique for the QRPA problem is, however, based on the matrix diagonalization, andis too demanding to perform repeatedly in medium and heavy systems as the dimension of the twoquasiparticle space become large.
The finite-amplitude method (FAM) technique for the linear-response theory [1] allows us to derive
efficient solutions for the QRPA problem within the nuclear DFT. In this presentation, I will show
the technique for evaluating the QRPA sum rules using the contour integration of the FAM response
function in the complex-energy plane [2]. From the ratio of the sum rule, the giant-resonance peakenergy can be evaluated. Typical examples of the giant-resonance energies of doubly magic systems
are discussed. Among the sum rules of different energy moments, the energy-weighted and inverseenergy-weighted sum rule are the most important ones. I will extend the Thouless theorem for theenergy-weighted sum rule in the case of the generalized nuclear DFT. The Thouless theorem has been
conventionally derived from the expectation value of the double commutator of the Hamiltonian, butsuch a Hamiltonian operator does not exist in the case of the nuclear DFT. I will derive the theorem
without using the double commutator of the Hamiltonian, and show the extended version of thetheorem for the nuclear DFT [3].
[1] T. Nakatsukasa, T. Inakura, and K. Yabana, Phys. Rev. C 76, 024318 (2007).
[2] N. Hinohara, M. Kortelainen, W. Nazarewicz, and E. Olsen, Phys. Rev. C 91, 044323 (2015).
[3] N. Hinohara, in preparation.

88

Nucleosynthesis by the neutrinos in the supernova explosion
Author(s): Myung-Ki CHEOUN1
Co-author(s): Eunja Ha 2 ; Heamin Ko 2 ; Taka Kajino 3
1

Soongsil University

2

Soongsil Univ.

3

NAOJ, University of Tokyo

Corresponding Author(s): eunhasky@hotmail.com, heamin1003@gmail.com, cheoun@ssu.ac.kr, kajino@nao.ac.jp

We present recent results of the the neutrino-process in the supernova explosion. In particular, we
discuss the neutrino-nucleus reactions by the QRPA formalism. Sensitivity of the reaction on the
nucleosynthesis is studied in detail. Also the MSW effects of the neutrino propagation are to bepresented for discussions. Finally, other exotic effets on the neutrino propagation, like the neutrino
self interaction, will be also discussed with numerical results of the related elements abundances inthis talk.

60

Peculiarities of interaction of weakly bound lithium nuclei (A=6–11) at low energies: Elastic scattering and Total reaction cross sections
Aidos Azhibekov1 ; Aisulu Mukhambetzhan2 ; Asset Kabyshev1 ; Bakhtiyar Sadykov3 ; Kairat Kuterbekov4
1

L.N. Gumilyov Eurasian National University

2

Korkyt-Ata Kyzylorda State University

3

Institute of Nuclear Physics

4

L.N.Gumilyov Eurasian National University

Page 11DREB2018 – 10th International Conference on Direct Reactions with E … / Report of Abstracts
Corresponding Author(s): assetenu@gmail.com, b.sadykov73@gmail.com, kkuterbekov@gmail.com, azhibekoaidos@mail.ru, aisulumuhankyzy@mail.ru

The review presents the latest experimental data on the total reaction cross sections and angular
distributions of differential cross sections for elastic scattering of light weakly bound lithium nuclei
6–9,11Li [1].
A review of papers on the interaction of weakly bound (cluster and exotic) 6-9Li and 11Li nuclei
published so far and their analysis shows that there are no experimental data on total reaction crosssections (TRC, σR) and it is necessary to measure it for Li-isotopes at energies from the Coulomb
barrier Bc=(3–4) MeV up to (10–40) MeV/nucleon on 28Si, 27Al, 9Be, and 12C nuclei.
For the interacting systems (8,9Li+28Si), there are only two points with a large energy error (about±10 MeV/nucleon) in Ref. [2] (Warner et al.): for (8Li+28Si)- reaction at 34 and 50 MeV/nucleon, andfor reaction (9Li+28Si)- at 37 and 50 MeV/nucleon.
The new data on TRC for reactions (8,9Li+28Si) in the energy range (5–30) MeV/nucleon with theiranalysis are presented in [3]. In the TRC energy dependence of (9Li+28Si) reaction, a “bump”, i.e.,a local increase in the cross section in the energy interval (10–30) MeV/nucleon, was first observed.
Therefore, this dependence requires further theoretical analysis and experimental study.
In Ref. [2] in the energy range from 25 to 52.5 MeV/nucleon there were only three points for TRC for
the system (11Li+28Si) at energies of 29.9, 42.5 and 52.5 MeV/nucleon. The points have large errors
both in energy (up to ±7 MeV/nucleon) and in the values of the cross section (±100 mb). In the workof Villari [4] one point at an energy of 25.5 with an error in the TRC value of ±386 mb was obtained.
Li Chen [5] presents six points at energies from 25 to 41 MeV/nucleon, however, he does not give
errors in cross sections and energy.
Therefore, the measurements of TRC (8,9,11Li+28Si), presented in [5, 3] and planned for 2018 in thepreviously unexplored energy interval, will fill the gap in the available literature data.
Large TRC values detected in the σR(Е) dependence, as well as their rapid increase in a short energy
interval in the low-energy region, can lead to a release of a large amount of energy, which is interesting in terms of search for new energy sources of the future.
The obtained new data (the existence of an anomalous increase in the TRC) in a narrow energy range(10-30) MeV/nucleon in the (6Не, 9Li)+28Si reactions at barrier energies will enable scientists to explain important questions of nucleosynthesis (nuclear astrophysics).
One of the most important features explaining why light elements are abundant in the universe is theincrease in the interaction cross sections in the sub-barrier energy region in nuclear reactions withweakly bound nuclei. This effect is especially strongly manifested for light cluster nuclei 6,9,11Li
and nuclei with a neutron halo 6,8He and 11Li. The main channels of interaction of such nuclei aretransfer, breakup and complete- fusion reactions.
Such peculiarities of interactions manifested in an increase in the cross section for the transfer ofclusters and for complete-fusion reactions near the Coulomb barrier are typical of many weakly
bound nuclei.
In the future, this will enable us to predict the trend in the change in the excitation function σR(Е) in
the interaction of a light weakly bound nucleus with the same target nucleus, in order to obtain the
TRC energy dependence at barrier energies. In particular, scientists are very interested in the TRC
behavior for such reactions as (11Li+2H), (11Li+9Be) and others at energies near (above and below)
the Coulomb barrier.

1. Kuterbekov K.A. et.al. // Chinese Journal of Physics. – 2017. – V. 55. – P. 2523-2539. https://doi.org/10.1016/j.cjph.2017.09
2. Warner R.E. et al. // Phys.Rev.C. – 1996. – V. 54. – P. 1700.
3. Kabyshev A.M. et al. // J.Phys.G: Nuclear and Particle Physics. – 2018. – V. 45. – P. 025103.
https://doi.org/10.1088/1361-6471/45/2/025103.
4. Villari A.C.C. et al. // Phys.Lett.B.– 1991. – V. 268.– P. 345.
5. Li Chen et al. // High Energy Physics and Nuclear Physics. – 2007. – V. 31, No. 12.– P. 1102.

132

Production of isomer beam around 52Fe nucleus via projectile
fragmentation
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Author(s): Keita Kawata1
Co-author(s): Hideyuki Sakai 2 ; Hiroki Nishibata 3 ; Juzo ZENIHIRO 3 ; Kentaro Yako 4 ; Laszlo Stuhl 1 ; Masanori
Dozono 5 ; Nobuaki IMAI 6 ; Noritaka Kitamura 1 ; Rieko Tsunoda 7 ; Rin Yokoyama 8 ; Shin’ichiro MICHIMASA 6 ;Shinsuke Ota 1 ; Shoichiro Masuoka 7 ; Tomoya Harada 9 ; Zhang Ningtao 7 ; chihiro iwamoto 10
1

Center for Nuclear Study, University of Tokyo

2

RNC

3

RIKEN Nishina Center

4

CNS, University of Tokyo

5

Center for Nuclear Study, the University of Tokyo

6

CNS, Univ. of Tokyo

7

Center for Nuclear Study,University of Tokyo

8

CNS, the University of Tokyo

9

Toho univ.

10

Research Center for Nuclear Physics (RCNP), Osaka University,Center for Nuclear Study,University of Tokyo

Corresponding Author(s): hiroki.nishibata@riken.jp, n.imai@cns.s.u-tokyo.ac.jp, zhangningtao@cns.s.u-tokyo.ac.jp,
iwamoto@rcnp.osaka-u.ac.jp, yako@cns.s.u-tokyo.ac.jp, tomoya.harada@riken.jp, stuhl@cns.s.u-tokyo.ac.jp, mitimasa@cns.s.utokyo.ac.jp, masuoka@cns.s.u-tokyo.ac.jp, juzo@ribf.riken.jp, yokoyama@cns.s.u-tokyo.ac.jp, keita-kawata@cns.s.utokyo.ac.jp, ota@cns.s.u-tokyo.ac.jp, hidesakai@riken.jp, kitamura@cns.s.u-tokyo.ac.jp, dozono@cns.s.u-tokyo.ac.jp,
r.tsunoda@cns.s.u-tokyo.ac.jp

Nuclear reaction in extreme condition is one of the attractive topics from the point of view of not
only the nuclear structure and reaction but also the nucleosynthesis. Although the electron capture
rate in supernova explosion is estimated from the charge exchange reaction with the ground state,
the charge exchange reaction with the high-excitation energy state may provide the rate in thesimilar circumstance with the supernova explosion. Fusion reactions with superdeformed nuclei
may provide us the high spin limit.
In some nuclei, there are long-lived states with high spins, so called isomers. The 12+ state in 52Fe
is a typical high-spin isomer with the lifetime of 46 second. The production of such an isomer beamprovides us the opportunities to challenge the reactions with high-temperature and high-spin state.
Presently the reported isomer ratio of 52Fe(12+) is below 1% while the isomer ratio of 10% is requiredfor charge exchange reactions. In this study we are aiming at the production of high-isomer-ratio
beams by changing the transfer momentum and incident angle.
Experiment (program number H362) was performed at HIMAC in Chiba. The ratios of isomericstates in the beams are measured by using projectile fragmentation from 58Ni and 82Kr, changing
momentum transfer, incident angle and incident nucleus.The incident energy was 350 MeV/u, which
is similar to the typical incident energy at RIBF. The beam particles implanted the active stopper ofplastic scintillator and two germanium detectors were placed beside the stopper in order to measure
the gamma rays from the decay of isomeric states. The decay gamma ray from isomer of 52Fe wasclearly observed and typical isomer ratio is more than 10 %.
In this talk, we report the detail of experiment and its result, and discuss the isomer production via
fragmentation reactions.

85

Progress of PANDORA Project
Author(s): JIAN GAO1
Co-author(s): Eiichi TAKADA 2 ; Hidetada Baba 1 ; Juzo ZENIHIRO 3 ; Kentaro YAKO 4 ; László STUHL 4 ; Masaki
SASANO 1 ; Tomohiro Uesaka 3 ; Valerii Panin 5 ; Yuki Kubota 3 ; Zaihong Yang 1 ; Zeren Korkulu 6
1

RIKEN

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DREB2018 – 10th International Conference on Direct Reactions with E … / Report of Abstracts
2

NIRS

3

RIKEN Nishina Center

4

CNS

5

RIKEN, Spin-isospin laboratory

6

ATOMKI

Corresponding Author(s): stuhl@cns.s.u-tokyo.ac.jp, takada.eiichi@qst.go.jp, valerii.panin@riken.jp, jian.gao@riken.jp,
korkulu@atomki.com, uesaka@riken.jp, zaihong.yang@riken.jp, kubota@ribf.riken.jp, sasano@ribf.riken.jp, yako@cns.s.utokyo.ac.jp, baba@ribf.riken.jp, juzo@ribf.riken.jp

The PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition) system is a neutron
detector based on plastic scintillator coupled to digital readout.[1] This system is designed for studyof unstable nuclei by (p,n) reaction using inverse kinematics. As it is well known, the detection of
low energy neutrons is difficult due to the gamma events background. A new type of scintillationmaterial provides different response to neutrons and gamma rays, so we can select neutron eventsby analyzing the pulse shape. This pulse shape analyses can be done by a digital data acquisition(DAQ) system so that the gamma background can be greatly suppressed.
Comparing to ref. 1, newer version scintillators with better neutron-gamma discrimination performance are applied. In addition, the DAQ software was modified to suit our configuration and somebugs were fixed. The system was commissioned in a 6He(p,n)6Li reaction experiment and the systemshows a good performance on neutron-gamma separation.
In this poster, we will show some results of the neutron-gamma separation and some preliminary
results of our (p,n) reaction experiment.
Reference:[1] L. Stuhl et al., Nucl. Instr. Meth. A 866, 164 (2017).

108

Proton- and deuteron-induced reactions on 107Pd and 93Zr at 20- 30 MeV/u
Author(s): Masanori Dozono1
Co-author(s): For ImPACT-RIBF Collaboration 2 ; Hideaki Otsu 3 ; Kotaro Iribe 4 ; Nobuaki IMAI 5 ; Shin’ichiro
MICHIMASA 5 ; Shinsuke Ota 6 ; Susumu Shimoura 7 ; Toshiyuki Sumikama 3 ; nobuyuki chiga 8
1Center for Nuclear Study, the University of Tokyo

2

dummy

3

RIKEN Nishina Center

4

Department of Physics, Kyushu University

5

CNS, Univ. of Tokyo

6

Center for Nuclear Study, University of Tokyo

7

CNS, University of Tokyo

8

japan

Corresponding Author(s): iribe@phys.kyushu-u.ac.jp, mitimasa@cns.s.u-tokyo.ac.jp, n.imai@cns.s.u-tokyo.ac.jp,
ota@cns.s.u-tokyo.ac.jp, dummy@dummy.co.jp, sumikama@ribf.riken.jp, shimoura@cns.s.u-tokyo.ac.jp, otsu@ribf.riken.jp,
nobuyuki.chiga@riken.jp, dozono@cns.s.u-tokyo.ac.jp

Nuclear transmutation of long-lived fission products (LLFPs), which are produced in nuclear reactors,
is one of the candidate techniques for the reduction and/or reuse of LLFPs. To design optimum
pathways of the transmutation process, several nuclear reactions have been studied by using LLFPs
as secondary beams. In this study, we report on the proton- and deuteron-induced reactions on
107Pd and 93Zr at 20 - 30 MeV/u.

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The experiment was performed at RIKEN RIBF. The degraded RI beams at 20 - 30 MeV/u were produced by a newly developed beam line, OEDO. To induce the reactions, the high-pressure cooled
gas targets (H2 and D2) were used. Reaction residues were analyzed by the SHARAQ spectrometer.
In this talk, we will present the details of the experiments and the obtained results.
This work was funded by ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan).

69

Quasi-free (p, 2p) reactions with 200-MeV protons on 112,124Sn
Author(s): Joochun Park1
Co-author(s): Alexander Knyazev 1 ; Joakim Cederkäll 1 ; Pavel Golubev 1
1

Lund University

Corresponding Author(s): alexander.knyazev@nuclear.lu.se, joakim.cederkall@nuclear.lu.se, joochun.park@nuclear.lu.se,
pavel.golubev@nuclear.lu.se

Single-particle structure and nucleon-nucleon correlations are a few topics of the R3B (Reactions
with Relativistic Radioactive Beams) research program to be carried out at FAIR. CALIFA (CALorimeter for In-Flight detection of gamma rays and high-energy charged pArticles) is one of the detector
systems of R3B. Components of the CALIFA Barrel are currently being assembled and tested. At the
Bronowice Cyclotron Center in Krakow, a beam of 200-MeV protons was used to induce quasi-free(p, 2p) reactions on various targets such as 12C, 16O, 112Sn, 124Sn, and 208Pb. Light charged fragments and gamma rays were detected with several CALIFA Barrel detector modules consisting ofCsI(Tl) crystals. Preliminary results from reactions on the 112Sn and 124Sn targets will be presented,
with emphasis on the differences in reaction cross sections to the ground and excited states of theresidual isotopes.

50

Recent advances and current status of chiral nuclear forces
Ruprecht Machleidt1
1

University of Idaho

Corresponding Author(s): machleid@uidaho.edu

During the past two decades, chiral effective field theory has evolved into a powerful tool to derive
nuclear two- and many-body forces in a systematic and model-independent way. Nowadays, mostab initio calculations of nuclear structure and reactions (including, in particular, exotic nuclei) areconducted with chiral forces. Therefore, it is of interest to have an overview of the status in thefield. Thus, after providing some background, I will summarize the state of the art in the construction of high-quality chiral two-nucleon forces. Furthermore, I will also elaborate on the derivation
and application of chiral three-nucleon forces, indispensible for any meaningful microscopic calculation.

49

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DREB2018 – 10th International Conference on Direct Reactions with E … / Report of Abstracts

S-matrix analysis of pairing correlation effects on low-energy swave scattering in neutron-rich nuclei
Author(s): Yoshihiko Kobayashi1
Co-author(s): Masayuki Matsuo 2
1

Faculty of Arts and Science, Kyushu University

2

Department of Physics, Niigata University

Corresponding Author(s): matsuo@nt.sc.niigata-u.ac.jp, kobayashi@artsci.kyushu-u.ac.jp

Effects of pairing correlation on s-wave scattering in superfluid nuclei are discussed. In the s-wave,
single-particle potential resonance cannot be formed due to no potential barrier, whereas quasiparticle resonance can be formed by the pairing correlation. The quasi-particle resonance is a novel
resonance in superfluid nuclei which is predicted by the Hartree-Fock-Bogoliubov (HFB) theory.
In recent progress of the SAMURAI experiments in RIKEN, characteristic s-wave peaks are observedin invariant mass spectroscopy of 21C. We anticipate that the s-wave peaks can be the s-wave quasiparticle resonance.
We analyze in detail how the low-lying s-wave quasi-particle resonance is governed by the pairingcorrelation in neutron drip-line nuclei. Solving the HFB equation in coordinate space with the scattering boundary condition, we calculate the phase shift, the elastic cross section, and the S-matrix.
We find that the pairing correlation influence strongly the phase shift and the elastic cross section,in addition, four poles of S-matrix emerge by the pairing correlation. As a numerical example, we
consider the 20C+n(s1/2) system to discuss the low-lying s-wave quasiparticle resonance.
In this presentation, we explain, using the S-matrix analysis, how the s-wave resonance caused by thepairing correlation (the s-wave quasi-particle resonance) emerge in neutron drip-line nuclei.

78

Spectroscopy of Neutron-Rich Al Isotopes at the Border of theIsland of Inversion
Philipp Schrock1
1

CNS, University of Tokyo

Corresponding Author(s): philipp@cns.s.u-tokyo.ac.jp

Neutron-rich Al isotopes (Z=13) lie at the transition point between the classical shell gap N=20 and
the Island of Inversion (IoI). Extended spectroscopy of the isotopes 32-35Al was performed at NSCL.
Each isotope has been produced via several reaction mechanisms (proton and neutron knockout,
fragmentation, charge changing, inelastic scattering) which are sensitive either to the proton or
neutron single-particle-like states or to collective states. The reaction products, i.e. fragments andprompt gamma-rays, were detected with the S800 Spectrograph and GRETINA, respectively.
Gamma-gamma coincidence analyses were performed and existing level schemes were updated. The
N=20 nucleus 33Al was produced via one- and two-proton and one-neutron knockout. A comparisonof the cross sections for the populated states shows clearly states belonging either to the proton or
neutron shells. The analysis of the parallel momentum distribution from one-neutron knockout
offers complementary information to reported one-proton knockout data.
The preliminary results will be presented and compared to state-of-the-art shell model calculations.

72

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Study of astrophysical α + 22Ne reaction using alpha transfer ininverse kinematics with TIARA and MDM spectrometer
Author(s): Shuya Ota1
Co-author(s): Adrien Matta 2 ; Cordero Magana 1 ; Curtis Hunt 1 ; Eames Bennett 1 ; Gavin Lotay 3 ; Gregory
Christian 1 ; Grigory Rogachev 1 ; Heshani Jayatissa 1 ; Josh Hooker 1 ; Mateo Muzek 1 ; Mohamed Mouhkaddam
3; Ryan Wilkinson 3 ; Saastamoinen Antti 1 ; Samuel Hallam 3 ; Sriteja Upadhyayula 1 ; Stefania Dede 1 ; Wilton
Catford 3
1

Texas A&M University

2

CNRS

3

University of Surrey

Corresponding Author(s): corderomagana@physics.tamu.edu, g.lotay@surrey.ac.uk, stefani-ad@tamu.edu, rogachev@tamu.edu, sriteja@physics.tamu.edu, w.catford@surrey.ac.uk, ebennett@tamu.edu, hesh.jayatissa@gmail.com,
ajsaasta@comp.tamu.edu, matta@lpccaen.in2p3.fr, joshhooker@physics.tamu.edu, cnhunt@physics.tamu.edu, cuda92.plava@tamu.edu,
shuyaota@comp.tamu.edu, r.wilkinson@surrey.ac.uk, s.hallam@surrey.ac.uk, gchristian@tamu.edu, mhd.moukaddam@gmail.com

In core He burning and C-shell burning of massive stars, the 22Ne(α,n)25Mg reaction is considered
to be a dominant neutron source for the weak s process. The reaction also largely contributes to theneutron production for the main s process in asymptotic giant branch (AGB) stars. While a variety ofexperimental attempts to determine the rate for this reaction at the Gamow window corresponding
to s process temperatures have been made either through direct or indirect measurements, uncertainties of some resonance strengths in 26Mg, particularly about two resonances (Ex ~ 11.17 and 11.32
MeV) above neutron separation energy (Sn =11.09 MeV), have remained a long-standing problem. To
address this problem, we performed an experiment using the 6Li(22Ne,26Mg)d α-transfer reaction in
inverse kinematics at K150 cyclotron of Texas A&M University. A 6LiF target was bombarded witha 7 MeV/u 22Ne beam. Deuterons, γ-rays, and recoil Mg ions were detected in coincidence usinga large Si detector array (TIARA), HPGe clover detectors, and an MDM spectrometer backed by anionization chamber, respectively, to precisely obtain the 26Mg excitation spectrum. Results about
the resonances obtained from the experiment will be presented.

126

Study of the Molecular States in Oxygen 20
Yang Liu1 ; Yanlin Ye2
1

Peking University, China

2

Peking University

Corresponding Author(s): yeyl@pku.edu.cn, liuyang_enphy@pku.edu.cn

It is well established that clustering is an essential aspect of nuclear many-body system. In neutronrich domains, the valence neutrons in nuclei can exist in molecular orbitals, their role is similar tothat of electrons in covalent bonds in atomic molecules, which help to stabilize the unstable multicluster states. The AMD plus GCM calculation found that the valence neutrons give richer structuresfor 20O. It suggests that the second 0+ band is a mixture of the 12C+4He+4n and 14C+6He cluster
structures, and the third 0+ band and the 0- band have prominent 16C+4He cluster structure, andthese two bands are regarded to be parity doublet bands.
Our group has performed an inelastic breakup experiment with a 30MeV/A 20O beam off a plastic
target in Lanzhou to study the cluster states in 20O above 16C+α breakup threshold. With boththe invariant mass and missing mass methods, we have detected the breakup fragments and therecoiled protons to reconstruct the two interest rotational bands. Thanks to the excellent energy
calibration results and particle identification, 7 excited states of Oxygen 20 from this spectrum are inexcellent agreement with those published in Bohlen’s work. Besides, a new excited state is proposed
to exist in Oxygen 20 with excitation energy of 17.16MeV, which decays predominantly in the wayof cluster emission rather than neutron emission. And this state has not been observed by previous
experiments.

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27

Study of the deuteron scattering on 7Li nuclei
Author(s): Maulen Nassurlla1
Co-author(s): Djumazia Burtebayeva 2 ; Erzhan Mukhamedzhanov 2 ; Marzhan Nassurlla 3 ; Nassurlla Burtebayev; Stanislav Sakuta 4 ; Takeshi Suzuki 5 ; Zhambul Kerimkulov 2

2

1

Institute of Nuclear Physics, Kazakhstan, Almaty;Al-Farabi Kazakh National University, Almaty, Kazakhstan

2

Institute of Nuclear Physics, Kazakhstan, Almaty

3Institute of Nuclear Physics, Kazakhstan, Almaty; Al-Farabi Kazakh National University, Almaty, Kazakhstan

4

National Research Center “Kurchatov Institute”, Moscow, Russia

5

Saitama University, Saitama, Japan

Corresponding Author(s): mnass911@mail.ru, taksuzuki59@gmail.com, maulennassurlla@gmail.com, nburtebayev@yandex.ru, nespad@mail.ru, juma1957@mail.ru, mao1990nas@mail.ru, morzhic@mail.ru

N. Burtebayev1, Maulen Nassurlla1,2, Zh.K. Kerimkulov1, D.T. Burtebayeva1, E.S. Mukhamedzhanov1,
Marzhan Nassurlla1,2, T. Suzuki3, S.B. Sakuta4
1 Institute of Nuclear Physics, Almaty, Kazakhstan
2 Al-Farabi Kazakh National University, Almaty, Kazakhstan
3 Saitama University, Saitama, Japan
4 National Research Center “Kurchatov Institute”, Moscow, Russia
New data of the differential cross section of the elastic and inelastic scattering of deuterons has beenmeasured at energies 14.5 MeV on the isochronous cyclotron U-150M (Institute of Nuclear Physics,
Almaty). The differential cross sections of the scattering were obtained for the ground state and thefollowing excited states of the 7Li: 1/2- (0.478 MeV), 7/2- (4.68 MeV) in the angular range 180 - 1400
in laboratory system. The angular distribution showed the diffraction structure of the elastically andinelastically scattered deuterons.
The optimal values of the potential parameters were established for the system “d + 7Li” as a functionof the energy from the joint analysis of the literature data at the energy range 7 - 25 MeV [1-4] within
the framework of the optical model. Previously, the analysis of scattering process was performedat energies 14.7 MeV [3] and 25 MeV [4], while at energy 14.7 MeV [3] the experimental data wereobtained at the forward hemisphere.
The analysis of differential cross sections of elastic and inelastic scattering of deuterons on 7Li atenergy 14.5 MeV were performed within the framework of the coupled channel method for thenegative parity levels that constitute the rotational band on the ground state of the nucleus using
the FRESCO program. The value of the quadrupole deformation parameter β2 determined from theanalysis of the inelastic scattering and is in agreement with the values established from the analysisof the scattering data for deuterons [4].
References:
1. S. N. Abramovich, B. Ja. Guzhovskij, B. M. Dzuba et al., J. Izv. Ross. Akad. Nauk, Ser. Fiz. 40, 842(1976).
2. H. G. Bingham, A. R. Zander, K.W. Kemper et al., Nucl. Phys. A 173, 265 (1971).
3. S. Matsuki, S. Yamashita, K. Fukunaga et al., J. Phys. Soc. Jpn. 26, 1344 (1969).
4. Burtebayev. N., Burtebayeva. J.T., Duisebayev A. et al. Acta Phys. Pol. B. 46, 1037(2015).

131

Study on performance of the OEDO beamline
Jongwon Hwang1 ; Shin’ichiro MICHIMASA2
1

Center for Nuclear Study, University of Tokyo

2

CNS, Univ. of Tokyo

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Corresponding Author(s): jw.hwang@cns.s.u-tokyo.ac.jp, mitimasa@cns.s.u-tokyo.ac.jp

OEDO (Optimized Energy Degrading Optics for RI beam) is the renovation project of the SHARAQ
beamline at RIBF-RIKEN to accommodate a RI beam of with a few tens of MeV/u by energy degrading
method. The highly exotic beams with such an energy, which still have been uncharted territory forthe existing RI beam facilities, are expected to be achievable by the OEDO beamline. The beamline
was designed to produce a well-focused beam of small momentum dispersion from secondary beams
separated by BigRIPS with the help of the angle-tunable energy degrader and the RF deflector.
The commissioning experiment of the OEDO beamline as a part of the ImPACT program for nuclear
transmutation of long-lived fission products (LLFPs) was carried out after the completion of construction in last year. The 79Se and 107Pd beams at 35 MeV/u (30 MeV/u for 107Pd) were produced
from the 180-MeV/u beams. The beamline elements were carefully optimized to obtain a beam ofhigh quality.
In this talk, the evaluation results of the performance of the OEDO beamline together with responses
on the beamline elements will be reported.

77

TINA - a New Silicon Tracker for Transfer Reactions
Philipp Schrock1
1

CNS, University of Tokyo

Corresponding Author(s): philipp@cns.s.u-tokyo.ac.jp

Transfer reactions are powerful tools to study the structure of atomic nuclei. The recently commissioned OEDO beamline of CNS and RIKEN can provide beams with the necessary intensities at
low energies (10-20 MeV/u) offering experimental access to regions of the nuclear chart which were
hitherto not accessible for transfer studies.
To utilize OEDO for transfer reactions, a detector array called TINA has been built and successfully
used in two experiments. TINA is a joint project of CNS, RCNP Osaka and RIKEN Nishina Center. It
is designed for the position and energy measurements of the recoiling light particles (protons) fromtransfer reactions in inverse kinematics.
The first version consists of six deltaE - E telescopes, each consisting of YY1-type silicon strip andCsI detectors. It has been used at Kyushu University Tandem Accelerator and at the OEDO facility.
An excellent performance has been achieved in identifying light reaction products and in obtaining
kinematics information with both stable and energy-degraded radioactive beams.
TINA is also compact enough to be coupled with 4-Pi gamma-ray detector arrays. An upgrade isongoing that implements highly granular DSSD detectors to improve the angular resolution. The
upgraded TINA will be well-suited for future transfer studies at OEDO and can compete with otherworld-leading devices.
A general overview, some first results about the performance and a short outlook on future perspectives will be presented.

51

The neutron magic number 28 and the structure in neutron-richnuclei
Author(s): Yoshiki Suzuki1

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DREB2018 – 10th International Conference on Direct Reactions with E … / Report of Abstracts
Co-author(s): Masaaki Kimura 2
1

Hokkaido Univ.

2

Hokkaido University

Corresponding Author(s): yoshiki@nucl.sci.hokudai.ac.jp, masaaki@nucl.sci.hokudai.ac.jp

The magic number 28 appears in the pf shell because of the spin-orbit interaction. However, insome N ≈ 28 neutron-rich nuclei, the neutron magic number 28 disappears. This leads to thequadrupole deformation of the ground state, the reduction of the excited energies and so on. In
what region of the nuclear chart, does the magic number disappear? This is one of the interesting
problems. In particular, in N = 26 isotones which have less neutrons than closed nuclei, does
the effect appear in the low-lying energy spectra? Then, we apply the antisymmetrized molecular
dynamics (AMD) combined with the generator coordinate method (GCM), and study the structureof N = 26 isotones.
As a result, we found that 44Ar and 40Si have triaxially deformed shape, and 42S has prolatedeformed shape at the ground states. In addition, we found that several 2+ states appear at low energies in these nuclei. It suggests that they are unstable against the deformation parameter γ.
Furthermore, we found that the rotational bands appear on the low-lying excited 0+ states in 44Ar
and 40Si. In these bands, 44Ar has prolate-deformed shape and 40Si has oblate-deformed shape. As
a result of the analysis of the single particles, we found that around 40% of last neutrons occupy thep orbits in the oblate-deformed states of 40Si.
It suggests the reduction of the energy gap in the neutron magic number 28.

37

Theoretical Study of Heavy-ion Charge Exchange Reaction at Intermediate Energies With Eikonal Model
Jingjing Li1
1

Peking University

Corresponding Author(s): rootgeant@gmail.com

Heavy-ion charge exchange reactions at intermediate energies have drawn much attention because
they have great advantages for determination of spin-isospin strength with better resolution andselectivity than that with nucleon probes such as (p,n) reaction. Such reactions could be used to extract values of GT strengh which is important for electron capture and beta-decay rates, and electron
capture results in the deleptonization of the Steller environment. With the development of new facilities, accelerators, and detectors, there are more and more experimental studies of heavy-ion charge
exchange reactions. However, in spite of the advantages of heavy-ion charge exchange reaction atintermediate energies, the reaction mechanisms for heavy ion induced charge exchange reactions
are more complicated than that for (p,n) or (n,p) reactions. Now, based on Eikonal approximation, a
newly developed theoretical instrument could give some results, and the results have been comparedwith that predicated by FOLD which has been developed based on DWBA.

99

Two novel determinations of nuclear density, temperature, symmetry energy
Author(s): Xingquan Liu1
Co-author(s): Jiansong Wang 1 ; Ryoichi Wada 1 ; Yanyun Yang 2

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1

IMPCAS

2

Institute of Modern Physics, CAS, China

Corresponding Author(s): liuxingquan@impcas.ac.cn, jswang@impcas.ac.cn, yangyanyun@impcas.ac.cn, wada@comp.tamu.edu

Nuclear symmetry energy, temperature and density at the time of the intermediate mass fragment
formation are determined using two novel methods, i.e., a self-consistent method and a chemical
potential method.
(1) In a self-consistent manner, the yields of primary hot fragments are experimentally reconstructed
for multifragmentation events in the reaction system ^64Zn + ^112Sn at 40 MeV/nucleon. Using thereconstructed hot isotope yields and an improved method, based on the modified Fisher model, symmetry energy values relative to the apparent temperature, a_sym/T, are extracted. The extracted
values are compared with those of the anti-symmetrized molecular dynamics (AMD) simulations,
extracted in the same way as that for the experiment, with the Gogny interaction with three different density-dependent symmetry energy terms. a_sym/T values change according to the densitydependent symmetry energy terms used. Using this relation, the density of the fragmenting system
is extracted first. Then symmetry energy and apparent temperature are determined in a self consistent manner in the AMD model simulations. Comparing the calculated a_sym/T values and thoseof the experimental values from the reconstructed yields, \rho /\rho_0 = 0.65 \pm 0.02 , a_sym =23.1 \pm 0.6 MeV and T= 5.0 \pm 0.4 MeV are evaluated for the fragmenting system experimentallyobserved in the reaction studied.
(2) In the chemical potential method, ratios of differential chemical potential values relative tothe temperature, (\mu_n-\mu_p)/T, extracted from isotope yields of thirteen reaction systems at
40 MeV/nucleon are compared to those of a quantum statistical model to determine the temperatureand symmetry energy values of the fragmenting system. The experimental (\mu_n-\mu_p)/T values are extracted based on the Modified Fisher Model. Using the density value of \rho/\rho_0=0.56
from the previous analysis, the temperature and symmetry energy values of T=4.6 \pm 0.4 MeV anda_sym=23.6 \pm 2.1 MeV are extracted in a frame work of a quantum statistical model. These values
agree well with those of the previous work, in which a self-consistent method is utilized with AMD
simulations.

133

Valence particle/hole-core couplings in neutron-rich, exotic nuclei
Author(s): Simone Bottoni1
Co-author(s): Angela Bracco 1 ; Bogdan Fornal 2 ; Bènèdicte Million 3 ; Calin A. Ur 4 ; Caterina Michelagnoli 5; Fabio C. L. Crespi 1 ; Gianluca Colò 1 ; Giovanna Benzoni 3 ; Michael Jentschel 5 ; Natalia Cieplicka-Oryńcza 2 ;Paolo Mutti 5 ; Pierfrancesco Bortignon 1 ; Silvia Leoni 1 ; Torsten Soldner 5 ; Ulli Köster 5 ; Waldemar Urban 6 ; Yifei
Niu 4 ; Łukasz Iskra 2
1

University of Milano and INFN2

IFJ PAN Krakow

3

INFN Milano

4

ELI-NP

5

ILL Grenoble

6

University of Warsaw

Corresponding Author(s): koester@ill.fr, benedicte.million@mi.infn.it, calin.ur@eli-np.ro, gianluca.colo@mi.infn.it,
michelagnolic@ill.fr, nyfster@gmail.com, lukasz.iskra@ifj.edu.pl, bogdan.fornal@ifj.edu.pl, silvia.leoni@mi.infn.it,
natalia.cieplicka@ifj.edu.pl, urban@ill.fr, mutti@ill.fr, fabio.crespi@mi.infn.it, jentsch@ill.fr, pierfrancesco.bortignon@mi.infn.it,
simone.bottoni@mi.infn.it, giovanna.benzoni@mi.infn.it, soldner@ill.eu, angela.bracco@mi.infn.it

The couplings between single-particle/hole degrees of freedom and collective and non-collective excitations are of primary importance in nuclear physics, as they are responsible for many phenomena

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DREB2018 – 10th International Conference on Direct Reactions with E … / Report of Abstracts
observed in atomic nuclei, from the damping of giant resonances, to the quenching of spectroscopic
factors and the anharmonicity of vibrational spectra [1].
While such properties have been investigated in the past in a limited number of stable nuclei, it isstill under discussion whether neutron rich, exotic nuclei display similar features and how couplings
with core excitations are influenced by the proton-to-neutron ratio and shell evolution.
To answer these questions, we present recent experimental results in the medium-heavy mass regions around the doubly-magic, neutron-rich 48 Ca and 132 Sn nuclei. In particular, we discuss new
spectroscopic information on the 47 Ca, 49 Ca, 133 Sb and 131 Sn isotopes, obtained in different experimental campaigns, at ILL (France) and LNL (Italy), by using large γ-ray setups based on HpGe
Detectors.
Experimental results will be interpreted by a new microscopic theoretical model, the Hybrid Configuration Mixing Model [2-3], specifically designed to describe the structure of nuclear systems with
one valence particle/hole outside a core. The model includes couplings between valence nucleonsand core excitations in a self-consistent way, by means of Hartree-Fock (HF) and Random Phase
Approximation (RPA) calculations using the Skyrme effective interaction and it accounts for bothcollective phonons and non-collective configurations.
The agreement between experimental and theoretical energies, electromagnetic transition probabilities and spectroscopic factors will be outlined, especially in the case of 133 Sb and 49 Ca, showing therelevance of the new approach, as compared to traditional shell model calculations with a frozen core.
Recent improvements of the model and possible future experimental developments with radioactive
beams will be discussed.
[1] A. Bohr and B. M. Mottelson, Nuclear Structure. Volume II: Nuclear Deformations (W. A. Benjamin, New York, 1980).
[2] G. Colò et al., Phys. Rev. C 95, 034303 (2017).
[3] G. Bocchi et al., Phys. Lett. B 760, 273 (2016).

35

cluster structure in 18O
Biao Yang1
1

Peking University

Corresponding Author(s): yb11951936@gmail.com

Alpha particle clustering is an important concept in nuclear physics, and it has been used over theyears to explain certain features in nuclei, especially for the study of light N = Z nuclei. It proved
to be far more difficult to study clustering phenomena in non-self-conjugate N != Z nuclei becauseof the addition degrees of freedom from the extra nucleons. However, the extra nucleons may haveimportant and special contribute to the formation of exotic, molecular-type structures, which provide an opportunity to understand the interplay between cluster and nucleon degrees of freedom.
18O is the prime example of a non-self-conjugate nucleus for which clustering is known to play animportant role.
A new experiment has been carried out at CIAE in 2017 to investigate the cluster structures of
18O through the multi-nucleon transfer reaction 9Be(13C,14C+alpha)alpha at 13C beam energy of
65MeV. In this experiment, coincidence detection of the 14C and alpha breakup fragments from 18O
was done by six sets of silicon detector telescopes. Owing to the extremely large positive reaction Qvalue, the interested reaction channel has been identified clearly. Through the missing mass method
and invariant mass method, excited states of 18O from 7MeV to ~20MeV were observed. At present,
further analysis has been applying to such states to extract the spin and then to search the monopoletransition in 18O.

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