bluuebunny/crossref_metadata_2025_split huggingface dataset:
Spontaneous Spin Polarization of Quark Matter due to Tensor Selfenergies in NJL model
Authors: Maruyama Tomoyuki , Tatsumi Toshitaka 
Published: December 2020

Abstract
We explore the spin-polarization of quark matter in the NJL model including the scalar and tensor interactions. There are two kinds of spin-polarized phases: one appears in the chiral-broken phase where the quark mass is non-zero, and the other in the chiral-restored phase where the quark mass is zero.
A model for neutrino-nucleus interactions in the GeV region
Authors: Barbaro M B 
Published: December 2020

Abstract
We review the recent progress in modelling neutrino-nucleus scattering, in a framework based on scaling which describes simultaneously the nuclear response to electromagnetic and weak probes. The study is relevant for the analysis of neutrino oscillation data and the design of the next generation experiments Hyper-Kamiokande and DUNE.
Impact of the Most Recent Total Absorption Gamma-ray Spectroscopy Data for Fission Fragments on Reactor Antineutrino Spectra and Comparison with the Daya Bay Results
Authors: Estienne M. , Fallot M. , Algora A. , Briz-Monago J. , Bui V.M. , Cormon S. , Gelletly W. , Giot L. , Guadilla V. , Jordan D. , Meur L. Le , Porta A. , Rice S. , Rubio B. , Taín J. L. , Valencia E. , Zakari-Issoufou A.-A. 
Published: December 2020

Abstract
The accurate determination of reactor antineutrino spectra is still a challenge. In 2017 the Daya Bay experiment has measured the evolution of the antineutrino flux with the fuel content of the reactor core. The observed deficit of the detected flux compared with the predictions of the conversion model was almost totally explained by the data arising from the fissions of 235U while the part dominated by the fission of 239Pu was in good agreement with the conversion model. The TAGS collaboration has carried out two experimental campaigns during the last decade at the JYFLTRAP of Jyväskylä (Finland) measuring a large set of data in order to improve the quality of the predictions of our summation method. These measurements allow the correction of the nuclear data for the Pandemonium effect, thus making an important contribution to calculating the antineutrino spectra. The impact of these ten years of measurement from our collaboration on the predicted antineutrino energy spectrum and flux are shown using our summation calculations. The results are compared with the Daya Bay measurements showing the best agreement in shape (in the antineutrino energy range 2 to 5 MeV) and in flux obtained so far with a model. The flux deficit observed by Daya Bay with respect to the summation method is now reduced to 1.9% leaving little room for the reactor anomaly. The shape anomaly between 5 and 7 MeV in antineutrino energy is still observed and remains unexplained.
Double beta decay and the quest for Majorana neutrinos
Authors: Kotila Jenni 
Published: December 2020

Abstract
The observation of neutrinoless double beta (0νββ) decay remains crucial for understanding lepton number violation. The inverse half-life for 0νββ-decay is given by the product of a phase space factor (PSF), a nuclear matrix element (NME), which both rely on theoretical description, and a function f containing the physics beyond the standard model. Phase space factors and nuclear matrix elements have been evaluated, or are under evaluation, systematically for all processes of interest. The nuclear matrix elements have been calculated within the framework of the microscopic interacting boson model (IBM-2), and phase space factors have been evaluated using exact Dirac electron wave functions. The current situation is then discussed by combining the theoretical results with experimental limits on the half-life of neutrinoless double beta decay. The extracted limits on the average light neutrino mass are addressed, complemented with a discussion of other possible 0νββ-decay mechanisms and scenarios.
Neutrino-nucleus reactions on oxygen and neon for nucleosynthesis and supernova neutrino detection
Authors: Suzuki Toshio , Chiba Satoshi , Yoshida Takashi , Nakazato Ken’ichiro , Sakuda Makoto , Takahashi Koh , Umeda Hideyuki 
Published: December 2020

Abstract
Spin-dipole strength in 16O and ν-induced reactions on 16O are studied by shell-model calculations. Charged- and neutral-current reaction cross sections for various particle and γ emission channels as well as the total ones are evaluated with the Hauser-Feshbach statistical method. Nucleosynthesis of 11B and 11C in supernovae through αp emission channels is investigated. Charged-current reaction cross sections induced by supernova ν and their dependence on ν oscillations are discussed for future supernova burst. Neutrino-nucleus reaction cross sections on 20Ne induced by Gamow-Teller and spin-dipole transitions are also investigated. Electron-capture rates for the forbidden transition 20Ne (e-, νe) 20F (2g.s.
+) at stellar environments are discussed.
HiSPANoS facility and the new neutron beam line for TOF measurements at the Spanish National Accelerator Lab (CNA)
Authors: Fernández B , Macías M , Guerrero C , Millán-Callado M A , Rodríguez-Gonzalez T , Quesada J M , Gómez-Camacho J , Praena J 
Published: December 2020

Abstract
HiSPANoS (HiSPAlis Neutron Source) is the first accelerator-based neutron facility in Spain, installed at the Centro Nacional de Aceleradores (CNA), where different experiments have been performed related to nuclear astrophysics, detector characterization, electronic devices irradiation, imaging, etc. An upgrade of the neutron facility has been carried out recently, installing a pulsing system at the 3 MV tandem accelerator at CNA. Such system, composed by a chopper and buncher unit, can provide nanosecond proton and deuteron pulsed beams. A new experimental line dedicated to neutron time-of-flight (n-TOF) technique has been installed at the tandem accelerator. Proton and deuterium pulse width of 1 ns have been measured with a repetition rate in the range of 62.5 kHz to 2 MHz. The commissioning of the n-TOF line has consisted of the measurement of the neutron field generated by 7Li(p,n) reaction with proton energy of 1912 keV.
The NArCoS Project: efficiency estimation and the cross talk problem studied through Monte Carlo simulations
Authors: Pagano E V , Auditore L , Cardella G , Filippo E De , Geraci E , Gnoffo B , Lanzalone G , Maiolino C , Martorana N S , Pagano A , Papa M , Pirrone S , Politi G , Rizzo F , Russotto P , Trimarchi M 
Published: December 2020

Abstract
With the advent of the new radioactive beam facilities it is necessary to develop neutron detection systems integrated with charged particle ones. The integration of the neutron signal, especially in using neutron rich beams, becomes a mandatory requirement in order to study the property of the nuclear matter in extreme conditions. For this reason new detectors using new materials have to be built. In this contribution, some new results about the efficiency estimation and the cross talk problem studied through GEANT4 simulations, related to the NArCoS project, will be described with the aim to design a new detector of both good energy and angular resolution. The detection of neutrons and charged particles in the same elementary detection cell is envisaged.
Overview on the Trojan Horse Method in nuclear astrophysics
Authors: Lamia L. , Pizzone R.G. , Mazzocco M. , Hayakawa S. , Cognata M. La , Bertulani C.A. , Cherubini S. , D’Agata G. , Guardo G.L. , Gulino M. , Indelicato I. , Rapisarda G.G. , Romano S. , Sergi M.L. , Spartá R. , Spitaleri C. , Tumino A. 
Published: December 2020

Abstract
The use of the Trojan Horse Method (THM) appears as one of the most suitable tools for investigating nuclear processes of interest for astrophysics. THM has been demonstrated to be useful for exploring different nuclear reactions intervening both in stellar and primordial nucleosynthesis as well. Some recent results will be here discussed together with a brief discussion of the fundamental theoretical description. General details about the recently studied 7Be(n,α)4He reaction will be given.
Monte Carlo variations as a tool to assess nuclear physics uncertainties in nucleosynthesis studies
Authors: Rauscher Thomas 
Published: December 2020

Abstract
The propagation of uncertainties in reaction cross sections and rates of neutron-, proton-, and α-induced reactions into the final isotopic abundances obtained in nucleosynthesis models is an important issue in studies of nucleosynthesis and Galactic Chemical Evolution. We developed a Monte Carlo method to allow large-scale postprocessing studies of the impact of nuclear uncertainties on nucleosynthesis. Temperature-dependent rate uncertainties combining realistic experimental and theoretical uncertainties are used. From detailed statistical analyses uncertainties in the final abundances are derived as probability density distributions. Furthermore, based on rate and abundance correlations an automated procedure identifies the most important reactions in complex flow patterns from superposition of many zones or tracers. The method already has been applied to a number of nucleosynthesis processes.
Magnetized rotational neutron star and the MR relations
Authors: Watanabe Chinatsu , Yanase Kota , Yoshinaga Naotaka 
Published: December 2020

Abstract
Radii and masses of neutron stars are calculated for various EoSs using a perturbative approach. Also increased masses are calculated due to magnetic fields. Moreover, the radius of a neutron star is calculated as a function of its increased total mass by rotation. As for the EoSs, we adopt 5 hadronic EoSs in relativistic mean field (RMF) theory to calculate the mass-radius relations (MR relations). It is found that the total masses are over twice the solar mass for all 5 hadronic EoSs in the presence of magnetic fields together with rotation. Three obtained EoSs (GM1, TM2-ωρ-a and TM2-ωρ-b) are found to be in the range of the observation. Hybrid stars are calculated to have masses more than twice the solar mass in a rapid rotation for 5 EoSs.
Nucleus-nucleus potentials from local chiral EFT interactions
Authors: Durant V. , Capel P. , Schwenk A. 
Published: December 2020

Abstract
We present the first determination of double-folding potentials (DFP) based on chiral effective field theory (EFT) nucleon-nucleon interactions at next-to-next-to-leading order (N2LO). To this end, we construct new two-body soft local chiral EFT interactions. We benchmark this approach in 16O-16O collisions, and extend it to the scattering of 12C-12C. We present results for cross sections computed for elastic scattering at energies up to 1000 MeV, as well as for the astrophysical S factor of the fusion of oxygen isotopes. Thanks to the predictive power of this approach, we can calculate various reaction observables without any adjusting parameters. Our analysis of these various reaction observables has enabled us to study the impact of the nuclear density and the nucleon-nucleon interaction on the corresponding cross sections.
Experimental study of 4
n with 8He(p,2p) reaction
Authors: Huang S. W. , Yang H. , Marqués F. M. , Achouri N. L. , Ahn D.S. , Aumann T. , Baba H. , Beaumel D. , Böhmer M. , Boretzky K. , Caamaño M. , Chen S. , Chiga N. , Cortés M.L. , Cortina D. , Doornenbal P. , Douma C. A. , Dufter F. , Feng J. , Fernández-Domínguez B. , Elekes Z. , Forsberg U. , Fujino T. , Fukuda N. , Gašparić I. , Ge Z. , Gernhäuser R. , Gheller J. M. , Gibelin J. , Gillibert A. , Godoy B. M. , Halász Z. , Harada T. , Harakeh M. N. , Hirayama A. , Inabe N. , Isobe T. , Kahlbow J. , Kalantar-Nayestanaki N. , Kim D. , Kim S. , Knösel M. A. , Kobayashi T. , Kondo Y. , Koseoglou P. , Kubota Y. , Kuti I. , Lehr C. , Li P. J. , Liu Y. , Maeda Y. , Masuoka S. , Matsumoto M. , Mayer J. , Miki H. , Miwa M. , Murray I. , Nakamura T. , Obertelli A. , Orr N. , Otsu H. , Panin V. , Park S. , Parlog M. , Paschalis S. , Potlog M. , Reichert S. , Revel A. , Rossi D. , Saito A. , Sasano M. , Sato H. , Scheit H. , Schindler F. , Shimada T. , Shimizu Y. , Shimoura S. , Stefan I. , Storck S. , Stuhl L. , Suzuki H. , Symochko D. , Takeda H. , Takeuchi S. , Tanaka J. , Togano Y. , Tomai T. , Törnqvsit H. T. , Tscheuschner J. , Uesaka T. , Wagner V. , Wimmer K. , Yamada H. , Yang B. , Yang L. , Yasuda Y. , Yoneda K. , Zanetti L. , Zenihiro J. , Elidiano T. , Lenain C. 
Published: December 2020

Abstract
The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or non-existence. A new experiment based on 8He(p,2p)7H{t+4
n} reaction, with direct detection of the four neutrons, has been carried out at RIBF, which can hopefully help to draw a definite conclusion on the tetraneutron system.
Nucleon-nucleon correlation studies in heavy-ion transfer reactions
Authors: Mijatović T , Szilner S , Corradi L , Galtarossa F , Montanari D , Pollarolo G , Čolović P , Colucci G , Fioretto E , Goasduff A , Malenica Jelavić D , Marchi T , Montagnoli G , Soić N , Scarlassara F , Stefanini A M , Valiente-Dobón J J 
Published: December 2020

Abstract
We present some of the recent experimental results in heavy-ion transfer reactions obtained with the large solid angle magnetic spectrometer PRISMA at energies close to the Coulomb barrier. We focus on a series of experiments that have been carried out to study the nucleon-nucleon correlations for closed shell and superfluid systems. They are discussed together with the newest results concerning the proton transfer channels above and below the Coulomb barrier. The second set of the experiments was performed to study the production mechanism of heavy neutron-rich nuclei and the related effects of secondary processes.
Measurements of total reaction cross sections for 17Ne using a solid hydrogen target
Authors: Moriguchi T. , Amano M. , Ozawa A. , Horiuchi W. , Abe Y. , Fujii T. , Kagesawa R. , Kamioka D. , Kitagawa A. , Mukai M. , Nagae D. , Sakaue M. , Sato S. , Suzuki S. , Suzuki T. , Yamaguchi T. , Yokota K. 
Published: December 2020

Abstract
We measured the energy dependence of the total reaction cross sections (σR) for the proton-drip-line nucleus,17Ne, using a solid hydrogen target. We compared the experimental data with theoretical calculations using the Glauber model. We found that the theoretical cross sections overestimate the experimental ones in the low-energy region (∼100A MeV), whereas they significantly underestimate the experimental data in the intermediate-energy region (∼300-500A MeV). These trends are the same as those for σR for carbon-proton collisions, which were measured previously. We discuss several possibilities for resolving this discrepancy. This work demonstrates the necessity of additional careful investigations of the energy dependence of σR for various nuclei on proton targets in order to determine nuclear size properties precisely.
Solving the apparent inconsistency between GSI and RIKEN estimates of 11Be dB(El)/dE
Authors: Moschini L , Capel P 
Published: December 2020

Abstract

11Be is the archetypical one-neutron halo nucleus. Due to its short lifetime, one of the only way to infer information about its exotic structure is to study reactions involving that nucleus, like breakup. When performed on a heavy target, like lead, breakup is dominated by the E1 transition from the bound state to the continuum, which is characterized by the dB(E1)/dE. This strength has been inferred from two experiments, one performed at 520A MeV at GSI and the other at 69A MeV at RIKEN. Strangely the analyses of both experiments provide different E1 strengths. In this work, we reanalyze them using the eikonal approximation to study this discrepancy. In particular, we properly take into account relativistic effects, and include a consistent treatment of both nuclear and Coulomb interactions and their interference at all orders. The description of the 11Be structure is provided by halo effective field theory (Halo-EFT). Our cross sections for the 11Be breakup are in good agreement with both RIKEN and GSI data. The dB(E1)/dE extracted from our 11Be model is in agreement with the RIKEN result and ab initio predictions. We can conclude that the discrepancy between GSI and RIKEN dB(E1)/dE arises from the method applied to extract this quantity. From our detailed analysis of the reaction, it seems that the most efficient way to extract the dB(E1)/dE from the breakup cross section is to select the data at small angles, where the reaction is dominated by the Coulomb interaction.
High-Momentum Correlated Nucleons, Tensor Blocking, and Nuclear Shell Structure
Authors: Tanihata I. 
Published: December 2020

Abstract
Studies of light neutron-rich nuclei revealed many new phenomena in nuclear structures and reactions. One of the most important recent discoveries is the change of magic numbers. Traditional magic numbers (2, 8, 20, 28, 50, 128) have been understood by the spin-orbit coupling in the mean-field potential and they provide the base of nuclear shell model. Recently, however, it was found that some of those magic numbers (N=8, 20) disappear in neutron-rich nuclei. On the other hand, new magic numbers (N=6, 14, 16, 32 and 34) emerge in neutron-rich nuclei. In the present paper, it is shown that tensor correlations give notable effects to such new structures. In nuclei a large amount of binding energy is gained by high-momentum correlated pairs of nucleons due to the tensor interaction. Such tensor correlations strongly depend on the configuration space available for exciting the 2p-2h states. When additional neutrons occupy a new orbital, the previously available 2p-2h configurations may be blocked, resulting in a sudden loss of binding energy otherwise gained by the 2p-2h excitations. Such tensor blocking effects enlarge the energy gaps at all the observed new magic numbers.
Implementation of the ELIGANT neutron and gamma detector arrays at ELI-NP
Authors: Capponi Luigi , Ciocan Gheorghe , Açiksöz Esra , Södeström Pär-Anders 
Published: December 2020

Abstract
ELIGANT is one of the main set of instruments for nuclear physics experiments with the versatile gamma-beam system that will be available at ELI-NP. One of the devices in the ELIGANT collection of instruments is the ELIGANT-GN, comprising of both neutron and γ-ray detectors. The description and details of the mechanical structure designed to hold the ELIGANT-GN neutron detectors is discussed in this report. In addition, the progress of the the implementation of this structure will be shown.
Phase transition between the isovector to isoscalar pairing correlations in deformed N = Z nuclei
Authors: Ha Eunja , Cheoun Myung-Ki , Sagawa H. 
Published: December 2020

Abstract
We investigate the pairing correlations on N = Z nuclei. In particular, the isoscalar (IS) pairing mode in neutron-proton (np) pairing is discussed in detail because the IS np pairing is closely related to the tensor force in the nucleon-nucleon interaction. Recent experiments demonstrated that the IS pairing might be enhanced from the M1 spin strength distribution data and deuteron, which is a consequence of the IS pairing, can be detected in 16O(p,p’d)14N reaction. The present study illustrates that the IS np pairing can be condensed not only in S=0, L = odd states but also in S=1, L=even states. The former is usually treated as T=0 np pairing. The latter is associated with deuteron and has not been fully treated in the BCS theory for the nuclear structure. In particular, the latter np pairing can be ejected as deuteron from the energetic probes in the experiments. Detailed analyses of the np pairing are performed mainly on 16O and extended to other N = Z nuclei.
Development of an accurate DWIA model of coherent π0 —photoproduction to study neutron skins in medium heavy nuclei
Authors: Colomer F. , Capel P. , Ferretti M. , Thiel M. , Sfienti C. , Tsaran V. , Vanderhaeghen M. 
Published: December 2020

Abstract
Despite decades of studies which have seen the nuclear charge distribution being measured with increasing precision, the neutron distribution remains elusive. The difference between the neutron and proton distributions is often expressed as the difference of their root mean square radii: the neutron skin thickness. Recently, the A2 collaboration at MaMi has measured the skin thickness in lead through coherent pion photoproduction [1] with a very high precision. However, they do not include theoretical uncertainties, which can be significant for this process.
A new reaction code in the distorted wave impulse approximation (DWIA) is developed to help the (ongoing) analysis of the recent measurement by the A2 collaboration at MaMi of the coherent pion photoproduction cross section on 116,120,124Sn isotopes [2] and to properly quantify the theoretical uncertainties.
Nuclear spectroscopy of r-process nuclei using KEK Isotope Separation System
Authors: Hirayama Y. , Watanabe Y.X. , Mukai M. , Ahmed M. , Ishiyama H. , Jeong S.C. , Kakiguchi Y. , Kimura S. , Moon J.Y. , Oyaizu M. , Park J.H. , Schury P. , Wada M. , Miyatake H. 
Published: December 2020

Abstract
We developed KEK Isotope Separation System (KISS) for the nuclear spectroscopy of the nuclei in the vicinity of N = 126. The spectroscopy is important to identify the explosive astrophysical environment for the formation of the third peak in the observed solar r-abundance pattern. We report the experimental results of in-gas-cell laser ionization spectroscopy and β-decay spectroscopy for the nuclei in the vicinity of 198Pt.
Investigation of 0+ strength in 150Sm using the (p,t) reaction
Authors: Ionescu A. , Pascu S. , Sima O. , Faestermann T. , Hertenberger R. , Mihai C. , Mihai R. , Niƫă C. , Turturică A. , Wirth H.-F. 
Published: December 2020

Abstract
The aim of this investigation is to reveal the structure of 150Sm by measuring for the first time a rather complete set of energy levels of this nucleus up to 4 MeV and determine the total angular momentum of the states. The study was carried out at the 14 MV Tandem Accelerator of the Munich universities by measuring complete angular distributions for states up to 4 MeV excited in the direct two-neutron transfer reaction 152Sm(p,t)150Sm at an incident energy of 22 MeV. Emphasis was put on determining the 0+ excited states, which are some of the most important excitations in the rare-earth region. Up to now only three 0+ levels are known in 150Sm, and investigating the distribution of energy and intensity of these excited states also at higher excitation energy might reveal the main contributions in the wave functions of this nucleus.
Short range correlations in nuclei and nuclear matter
Authors: Rios Arnau 
Published: December 2020

Abstract
Short range correlations in nuclei and nuclear matter arise from the strong repulsion of the nuclear interaction at short distances. The existence of these correlations has been confirmed in a variety of nuclear experiments with electroweak and hadronic probes. The theoretical and experimental efforts in the last decade have focused on quantifying short-range correlations and, in particular, their isospin dependence. Here, I will analyze and summarise some of the recent conclusions in the literature using as a baseline a theoretical method, based on many-body Green’s functions theory, and a single quantity, the one-body momentum distribution.
Outreach and engagement in Australia and the Indo-Pacific region
Authors: Mitchell A J 
Published: December 2020

Abstract
Outreach and engagement activities have been core functions of the Australian National University Department of Nuclear Physics for many years. Staff and students of the Department play an important role in educating local high school students, Australian Federal Government employees and the general public. As the ‘national’ university, we also accept a social responsibility to undertake endeavours that align with Australia’s broader strategic priorities. One of these is to make a positive, sustained contribution to the overall growth and development of our geographical neighbours. Here, I report on the existing program of local outreach at the ANU Heavy Ion Accelerator Facility, selected international engagement activities and comment on opportunities for future growth.