bluuebunny/crossref_metadata_2025_split huggingface dataset:
Considerations on the composition and spectra of the secondary radiation fields inside the E1 experimental area at ELI-NP
Authors: Popovici Maria – Ana , Vasilache Radu A. 
Published: December 2020

Abstract
At the new ultrahigh power laser facility ELI NP, experiments on the interaction of high power lasers and matter will be conducted. These experiments are expected to produce beams of highly energetic particles resulting in secondary radiation fields which will be highly complex and rather difficult to measure given their specifics (extremely short bursts, with time widths in the range of nanoseconds). The ELIFLUKA project was started to assess the doses in the areas surrounding the experimental halls, to evaluate the efficiency of the existing shielding solutions, to propose, if necessary, their optimization, and give optimal ways to monitor the radiation fields that might affect the facility personnel. The present paper is focused on the results concerning the composition and the spectra of the secondary radiation fields inside the E’ experimental hall. A complex FLUKA geometry of the El area was built according to the real design of the experimental hall. With FLUKA we calculated the particle fluencies, the spatial distribution and spectra of each component of the radiation field, corresponding to two limit source terms, characterised by a thermal energy distribution with 40 MeV average and 250 MeV cut-off, and a second one with a flat energy distribution with 500 MeV average and 50 MeV FWHM. The FLUKA code was used to calculate all particle fluence spatial distribution inside the experimental hall, as well as the fluences and spectra for the main components of secondary radiation fields. These results can be used to design various experimental setups at E1 in such a way that the instruments would be positioned without risking significant activation and/or radiation damage and they provide a source term for the shielding calculations using the classical methods, as usually requested by the regulatory authorities.
A Prototype Detector Array for Measurements in Laser Accelerated Charged Particle Beams
Authors: Vasilache Radu A. , Popovici Maria–Ana , Straticiuc Mihai , Matei Consuela Elena , Stroe Daniela , Crăciun Liviu , Radu Mihai , Maria Niță Laura Ana 
Published: December 2020

Abstract
In all the future applications of the laser accelerated beams (as generated in the ELI and CETAL projects) in-beam dose measurements will be needed. The gold standard in dose measurement remain the ion chambers, but for the beams we intend to measure they do present some limitations given be the large number of corrections to be applied in order to calculate a correct dose from the measured charge. The ELIDOSE project is addressing these problems by proposing an array detector that would allow the simultaneous measurement of the recombination and polarity corrections, as well as of the dose – the QUADRO-fm (Quad Detector for RecOmbination factor measurement). The prototype detector consists of 4 identical ion chambers mounted together in a PMMA frame and the project analyses its response to various charged particle beams and the reciprocal influences of the chambers on each other. This reciprocal influences of the four chambers have been studied in well characterised therapy electron beams and conclusions regarding further developments have been drawn. The paper presents the characterisation of the proton and electron beams used in the experiment, as well as the dose measurements in the 5 MeV electron beams generated by a Siemens radiotherapy LINAC and the comparison with the FLUKA based simulations.
Measuring the half-life of n-rich 100Rb with the TITAN MR-TOF-MS
Authors: Mukul I. , Andreoiu C. , Brodeur M. , Brunner T. , Dietrich K. , Dickel T. , Dillmann I. , Dunling E. , Fusco D. , Gwinner G. , Izzo C. , Jacobs A. , Kootte B. , Lan Y. , Leistenschneider E. , Lykiardopoulou M. , Paul S. F. , Reiter M. P. , Tracy J. L. , Dilling J. , Kwiatkowski A. A. 
Published: December 2020

Abstract
Multiple-reflection time-of-flight mass spectrometers (MR-TOF-MS) have been demonstrated to have a mass resolving power in the range of few hundreds of thousand. The TITAN MR-TOF-MS has been used to separate isobaric impurities and measure masses of many rare isotopes. Recently we have measured the mass and half-lives of neutron-rich Rubidium isotopes with the MR-TOF-MS. This technique is capable of measuring the half-life of rare isotopes in the range of few tens of millisecond. In this proceeding, we present the measurement of half-life of 100Rb that was found to be 50±5 ms, in good agreement with literature value of 48±3 ms.
Systematic study of pasta nuclei in neutron stars with families of the empirical nuclear equations of state
Authors: Oyamatsu Kazuhiro , Iida Kei , Sotani Hajime 
Published: December 2020

Abstract
The structures of pasta nuclei in the crust of a neutron star are investigated systematically by using a family of the equations of state (EOSs) of nuclear matter within the framework of the Thomas-Fermi theory. This EOS family is given as a function of the incompressibility K
0 of symmetric nuclear matter and the parameter L that characterizes the density dependence of the symmetry energy. The remaining saturation parameters are chosen so that the masses and radii of stable nuclei calculated within the framework are consistent with the empirical values. The structure of a neutron-rich nucleus is determined by the local pressure balance of asymmetric nuclear matter, which is mainly controlled by L and K
0. With this EOS family, we calculate the structure of pasta nuclei in the crust of a neutron star, and examine its (K
0, L) dependence. It is found that the existence of pasta nuclei is mainly determined by L. For sufficiently small L, as the matter density increases, the shape of the nuclei changes from sphere to cylinder, slab, cylindrical hole and spherical hole successively. For larger L, this sequence of the shape change may end before reaching spherical hole. All the pasta shape can exist for L ≤ 70 MeV, while no pasta shape appears for L ≥ 110 MeV. The density width of each pasta phase, the energy and volume fraction at the onset of each pasta phase have a clear correlation with L while the onset density also has an appreciable Ko dependence.
Change of 7Be decay rate under compression
Authors: Sikdar A. K. , Ray A. , Das P. , Pathak S. , Datta J. 
Published: December 2020

Abstract
We have studied the change of decay rate of 7Be implanted in the small Pd lattice versus large Pb lattice. Since the electron affinities of Pd and Pb are very low and similar, any observed increase of the decay rate of 7Be could be attributed to the compressional effect in the smaller confinement of Pd lattice. It has been found that the decay rate of 7Be is faster in Pd lattice compared to that in Pb lattice by (0.82± 0.16)%. Similar results were observed by applying high external pressure on 7BeO lattice. Density functional calculations underpredict the increase of 7Be decay rate under compression by a large factor. It is important to understand this result because of its significance in calculating 7Be decay rate in the solar core and corresponding 8B neutrino flux.
Exploring continuum structures in reactions with three-body nuclei
Authors: Casal J. , Gómez-Ramos M. , Moro A. M. , Corsi A. 
Published: December 2020

Abstract
The Transfer to the Continuum method has been applied to describe the 11Li(p, pn) and 14Be(p, pn) reactions in inverse kinematics, using structure overlaps computed within a full three-body model for the projectile. Calculations agree with the available experimental data on the unbound 10Li and 13Be nuclei.
Combining nuclear reactions and structure with the dispersive optical model
Authors: Dickhoff W. H. , Atkinson M. C. 
Published: December 2020

Abstract
A review of recent applications of the nonlocal dispersive optical model (DOM) is presented that allows a simultaneous description of nuclear structure and nuclear reactions. An assessment of the quality of the resulting potentials for 40Ca and 48Ca is discussed for the description of the (e, e′p) reaction to valence hole states and the possibility of interpreting the data in terms of absolute spectroscopic factors. The relevance of these results in the context of conflicting interpretations between transfer and knockout reactions is pointed out as well as the importance of proton reaction cross sections for isotopes with neutron excess. Application of the nonlocal DOM to 48Ca incorporates the effect of the 8 additional neutrons and allows for an excellent description of elastic scattering data of both protons and neutrons. The corresponding neutron distribution constrained by all available data generates a prediction for the neutron skin that is larger than most mean-field and available ab initio results. Results are presented for the most recent nonlocal DOM analysis of 208Pb.
Isospin Effect on fragment productions and reaction mechanisms for Ni+Ca systems at 25 AMeV
Authors: Geraci E , Cardella G , Colonna M , De Filippo E , Gnoffo B , Lanzalone G , Lo Monaco L , Maiolino C , Martorana N S , Pagano A , Pagano E V , Papa M , Pirrone S , Politi G , Russotto P , Rizzo F , Trifiró A , Trimarchi M , Barlini S , Bougault R , Bruno M , Casini G , D’Agostino M , Gramegna F , Neindre N Le , Morelli L , Piantelli S 
Published: December 2020

Abstract
Main features of fragments produced in 58Ni+40Ca and 58Ni+48Ca systems at 25 AMeV, collected by Chimera multidetector at INFN Laboratori Nazionali del Sud (Italy), are analysed in order to study properties of moderately excited systems (Ex=2-5 AMeV) formed in central collisions. By means of correlations between specific global variables, sensitive to the centrality of the collision, a stringent selection of Fusion-Evaporation residues, Multifragmentation sources and their decay products has been performed. The influence of the isospin contents of the systems on the reaction mechanism is carefully investigated and relevant observables such as isospin asymmetry N/Z or charge and mass of fragments, are discussed in order to probe the fragmentation path, characterised by short living ( ∼ 100fm/c) low density states of nuclear matter out of equilibrium. Preliminary comparisons with predictions of the BLOB model, in a semi-classical mean field framework, are presented, investigating cluster production emerging from the occurrence of low-density instabilities in central collisions.
Role of higher order deformations in fission fragment mass distribution of Astatine isotopes within collective clusterization approach
Authors: Kaur Amandeep , Sharma Manoj K. 
Published: December 2020

Abstract
The fission fragment mass distribution is used as an investigation tool which assists to disentangle between different modes of fission (symmetric fission and asymmetric fission). In the present work, the fission dynamics of various ‘At*’ isotopes with mass number A=191 to 220 formed in 19F-induced reactions at common centre-of-mass energy Ec.m
.=78.5 MeV is explored. The calculations are made within the dynamical cluster-decay model (DCM) using three type of fragmentation such as spherical, (β
2-deformed and (β
2 – β
2-deformed with hot compact optimized orientations. The structural effects come into picture when deformation effects are included in the fragmentation potential. The mass distributions of ‘At*’ isotopes gets significantly modified after inclusion of deformation effects of decaying fragments. The preformation yield shows a drift from symmetric to asymmetric fission with increase in mass of compound nuclei from ACN
=191 to 220. The clear signature of fine-structure effects is evident in view of single humped to double humped preformation structure in the fissioning region. However, the mass division of At isotopes is symmetric for spherical choice of fragments. Finally, the analysis of hot (compact) and cold (elongated) configurations of β
2-deformed and

θ
i

o
p
t

oriented fragments is also carried out.
Study of fusion hindrance in the system 12C+24Mg
Authors: Montagnoli G. , Stefanini A.M. , Jiang C.L. , Colucci G. , Goasduff A. , Brugnara D. , Mazzocco M. , Siciliano M. , Scarlassara F. , Corradi L. , Fioretto E. , Galtarossa F. , Heine M. , Patten T. Van , Szilner S. , Ćolović P. , Mijatović T. , Bottoni S. , Jaworski G. , Zanon I. 
Published: December 2020

Abstract
The phenomenon of fusion hindrance may have important consequences on the nuclear processes occurring in astrophysical scenarios, if it is a general behaviour of heavy-ion fusion at extreme sub-barrier energies, including reactions involving lighter systems, e.g. reactions in the carbon and oxygen burning stages of heavy stars. The hindrance is generally identified by the observation of a maximum of the S-factor vs. energy. Whether there is an S-factor maximum at very low energies for systems with a positive fusion Q-value is an experimentally challenging question. Our aim has been to search evidence for fusion hindrance in 12C + 24Mg which is a medium-light systems with positive Q-value for fusion, besides the heavier cases where hindrance is recognised to be a general phenomenon. The experiment has been performed at the XTU Tandem accelerator of LNL by directly detecting the fusion evaporation residues at very forward angles. The excitation function has been extended down to ≃10μb, i.e. 4 orders of magnitude lower than previous measurements and we observe that the S-factor develops a clear maximum vs. energy. Coupled-Channels calculations using a Woods-Saxon potential give a good account of the data near and above the barrier but over predict the cross sections at very low energies. Therefore the hindrance phenomenon is clearly recognised in 12 C + 24 Mg with an energy threshold that nicely fits the systematics in several medium-light systems. The fusion cross sections at the hindrance threshold show that the highest value (as=1.6mb) is indeed found for this system. It may be possible to extend the measurements further down in energy.
Regularized pseudopotential for mean-field calculations
Authors: Bennaceur K , Dobaczewski J , Haverinen T , Kortelainen M 
Published: December 2020

Abstract
We present preliminary results obtained with a finite-range two-body pseudopotential complemented with zero-range spin-orbit and density-dependent terms. After discussing the penalty function used to adjust parameters, we discuss predictions for binding energies of spherical nuclei calculated at the mean-field level, and we compare them with those obtained using the standard Gogny D1S finite-range effective interaction.
Triangular symmetry in cluster nuclei
Authors: Bijker R. , Santana-Valdés A.H. 
Published: December 2020

Abstract
In this contribution, we present evidence for the occurrence of triangular symmetry in cluster nuclei. We discuss the structure of rotational bands for 3α and 3α +1 configurations with triangular D
3h
symmetry by exploiting the double group

D

3
h

′

and study the application to 12 C and 13C. The structure of rotational bands can be used as a fingerprint of the underlying geometric configuration of α particles.
Reaction Channel selection techniques and γ – γ fast-timing spectroscopy using the ν-Ball Spectrometer
Authors: Canavan R.L. , Rudigier M. , Regan P.H. , Lebois M. , Wilson J.N. , Jovancevic N. , Söderström P.-A. , Thisse D. , Benito J. , Bottoni S. , Brunet M. , Cieplicka-Oryńczak N. , Collins S.M. , Courtin S. , Doherty D.T. , Fraile L.M. , Hadyńska-Klęk K. , Heine M. , Iskra Ł.W. , Karayonchev V. , Kennington A. , Koseoglou P. , Lotay G. , Lorusso G. , Nakhostin M. , Niţă C.R. , Oberstedt S. , Podolyák Zs. , Qi L. , Régis J.-M. , Shearman R. , Vedia V. , Witt W. 
Published: December 2020

Abstract
The reaction of a pulsed 18O beam on a self-supporting and gold-backed isotopically-enriched 164Dy target of thickness 6.3 mg/cm2 at separate primary beam energies of 71, 76 and 80 MeV was studied at the accelerator at the ALTO facility of the IPN Orsay. The γ rays produced were detected using the newly-constructed ν-Ball spectrometer which comprised of HPGe and LaBr3(Ce) detectors. This conference paper describes the methodology and effectiveness of multiplicity/sum-energy gating, for channel selection between fusion evaporation events and lower multiplicity/energy events from inelastic nuclear scattering and Coulomb excitation of the target, and from two-neutron transfer reactions to 166Dy.
Spectroscopic Tools Applied to Flerovium Decay Chains
Authors: Cox D. M. , Såmark-Roth A. , Rudolph D. , Sarmiento L.G. , Fahlander C. , Forsberg U. , Golubev P. , Heery J.A.M. , Yakushev A. , Albers H. M. , Block M. , Brand H. , Clark R.M. , Düllmann Ch.E. , Eberth J. , Gates J.M. , Giacoppo F. , Götz M. , Götz S. , Herzberg R.-D. , Jäger E. , Kindler B. , Khuyagbaatar J. , Kojouharov I. , Kratz J.V. , Krier J. , Kurz N. , Lens L. , Lommel B. , Mistry A. , Meyer C.-C. , Mokry C. , Papadakis P. , Pore J.L. , Runke J. , Thörle-Pospiech P. , Trautmann N. , Schaffner H , Schausten B. , Uusitalo J. 
Published: December 2020

Abstract
An upgraded TASISpec setup, with the addition of a veto DSSD and the new Compex detector-germanium array, has been employed with the gas-filled recoil separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, to study flerovium (element 114) decay chains. The detector upgrades along with development of new analytical techniques have improved the sensitivity of the TASISpec setup for measuring α-photon coincidences. These improvements have been assessed with test reactions. The reaction 48Ca+206,207Pb was used for verification of experimental parameters such as transmission to implantation DSSD and target-segment to α-decay correlations. The reaction 48Ca+
nat
Hf was used to produce several short-lived nuclei with multiple-α decay chains to investigate pile-up event deconvolution.
Halo-like structure in 7He nucleus
Authors: Demyanova A S , Ogloblin A A , Chernishev B A , Goncharov S A , Gurov Yu B , Lapushkin S V , Belyaeva T L , Danilov A N , Starastsin V I , Trzaska W H 
Published: December 2020

Abstract
A study of the neutron structure of the ground state of 7He has been performed by means of registration and analysis of the decay channels of the residual nuclei following absorption of stopped pions. In particular, the reaction 9Be (

π

−

,
d

)X have been investigated where X denotes any system with five neutrons and two protons – the constituencies of a 7He nucleus. It was shown that the structure of 7He is determined by correlations of two neutrons in the states 6He (0+), 6He (2+) and one neutron in the shell p3/2. The 4He+3n structure is not manifested in the ground state of 7He. The obtained results are consistent with the known data on considerable mixture of configurations “6He in its ground and first excited states plus a neutron” in the ground state of 7He. Comparison of the diffraction components of the differential cross-sections of the charge-exchange reactions (t, 3He) measured on 6Li and 7Li allowed extracting the radius of particle-unstable nucleus 7He. The latter occurred to be approximately equal to those of 6He and 8He. The obtained result indicates to existence of the halo-like structure in 7He.
Nuclear incompressibility from spherical and deformed nuclei
Authors: Gambacurta Danilo , Colò Gianluca , Pastore Alessandro 
Published: December 2020

Abstract
We present an analysis based on the deformed Quasi Particle Random Phase Approximation, on top of a deformed Hartree-Fock-Bogoliubov description of the ground state, aimed at studying the isoscalar monopole and quadrupole response in a deformed nucleus. This analysis is motivated by the need of understanding the coupling between the two modes and how it might affect the extraction of the nuclear incompressibility from the monopole distribution. After discussing this motivation, we present the main ingredients of our theoretical framework, and we show some results obtained with the SLy4 and SkM* interactions for the nucleus 24Mg.
Multiple Shape Coexistence in 110,112Cd and Beyond Mean Field Calculations
Authors: Garrett P.E. , Rodríguez T.R. , Varela A. Diaz , Green K.L. , Bangay J. , Finlay A. , Austin R.A.E. , Ball G.C. , Bandyopadhyay D.S. , Bildstein V. , Colosimo S. , Cross D.S. , Demand G.A. , Finlay P. , Garnsworthy A.B. , Grinyer G.F. , Hackman G. , Jigmeddorj B. , Jolie J. , Kulp W.D. , Leach K.G. , Morten A.C. , Orce J.N. , Person C.J. , Phillips A.A. , Radich A.J. , Rand E.T. , Schumaker M.A. , Svensson C.E. , Sumithrarachchi C. , Triambak S. , Warr N. , Wong J. , Wood J.L. , Yates S.W. 
Published: December 2020

Abstract
Detailed spectroscopy employing the β
+/EC decay of 110,112In and the β
− decay of 112Ag has been used to study the excited states of 110,112Cd. Low-energy decay branches from highly excited states have been observed and, combined with level lifetimes from the (

n
,

n

’

γ

) reaction, permit B(E2) values to be determined thus revealing rotational-like bands built on excited 0+ states and γ bands built on the ground and the shape-coexisting intruder states. The excitation energies of the

0
4
+

states appear incompatible with that expected for a pure π(4p6h) configuration. The experimental results for the 0+ excited states are compared with beyond-mean-field calculations that suggest they possess different shapes, including prolate, oblate, and triaxial.
The γ decay of the Hoyle and higher excitation energy states of 12C
Authors: Cardella G. , Favela F. , Martorana N.S. , Acosta L. , Auditore L. , Camaiani A. , Filippo E. De , Gelli N. , Geraci E. , Gnoffo B. , Guazzoni C. , Marìn-Làmbarri J. , Lanzalone G. , Maiolino C. , Monaco L. Lo , Nannini A. , Pagano A. , Pagano E.V. , Papa M. , Pirrone S. , Politi G. , Pollacco E. , Quattrocchi L. , Rizzo F. , Russotto P. , Santonocito D. , Sicari V. , Trifiró A. , Trimarchi M. 
Published: December 2020

Abstract
The

0
2
+

Hoyle state and few other excited levels of 12C are fundamental for the production of carbon in the universe. In particular, the γ decay branching ratio is of utmost importance, being the only way to produce a carbon at the ground state. For the purpose to precisely investigate the decay mechanism of such states we conducted an experiment, at Laboratori Nazionali del Sud-Istituto Nazionale di Fisica Nucleare (INFN-LNS), using the reaction α + 12 C at 64 MeV. We used the 4π CHIMERA detector to detect both α and γ
12 C decay channels. Details of the experiment and preliminary results are discussed in the paper.
Dealing with contaminants in Coulomb excitation of radioactive beams
Authors: Morrison L , Hadyńska-Klęk K , Podolyák Zs , Gaffney L P , Kaya L , Berry T , Boukhari A , Brunet M , Canavan R , Catherall R , Colosimo S J , Cubiss J G , Witte H De , Doherty D T , Fransen Ch , Giannopoulos E , Grawe H , Hess H , Kröll T , Lalović N , Marsh B , Martinez Palenzuela Y , O’Neill G , Pakarinen J , Ramos J P , Reiter P , Rodriguez J A , Rosiak D , Rothe S , Rudigier M , Siciliano M , Simpson E C , Spagnoletti P , Thiel S , Warr N , Wenander F , Zidarova R , Zielińska M 
Published: December 2020

Abstract
Data analysis of the Coulomb excitation experiment of the exotic 206Hg nucleus, recently performed at CERN’s HIE-ISOLDE facility, needs to account for the contribution to target excitation due to the strongly-present beam contaminant 130Xe. In this paper, the contamination subtraction procedure is presented.