Nuclear Physics A最新文献

{"title":"Fission path analysis in 48Ca-induced actinide reactions using the dynamical cluster-decay model","authors":"Dalip Singh Verma,&nbsp;Vivek","doi":"10.1016/j.nuclphysa.2025.123194","DOIUrl":"10.1016/j.nuclphysa.2025.123194","url":null,"abstract":"<div><div>Generally, the most probable fission path corresponds to the lowest energy in the fragmentation potential calculated within theoretical models. However, recent experimental mass yields measured in ⁴⁸Ca-induced actinide reactions show discrepancies compared to theoretical predictions based on the proximity potential (Prox77), particularly in the symmetric mass region. To investigate this discrepancy, the dynamical cluster-decay model is used, incorporating bulk and neutron-proton asymmetry coefficients, in the shape-dependent mass excess formula, recently updated to reproduce the ground-state mass excess data of AME2020 and/or FRDM(2012). Temperature dependence is used in both the deformation parameter and the surface energy coefficient of the proximity potential. Calculations are performed using various nuclear radius formulae. The most probable fission channel, corresponding to the minimum in the fragmentation potential, is found to match the experimental observations in both symmetric and asymmetric regions when using the radius formula of Bass along with the updated model inputs. The spherical and/or deformed shell closures associated with the most probable fission paths in the fission fragment mass distributions are analyzed. The most probable channels are associated with ¹³⁴Te in the symmetric region and lead isotopes (Pb) in the asymmetric region, except in the case of ²⁸⁰Ds^⁎. The dominant fission mode is asymmetric, which agrees with experimental findings.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1063 ","pages":"Article 123194"},"PeriodicalIF":1.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “First observation of MNT isotope beams at the FRS Ion Catcher” [Nuclear Physics A 1057 (2025) 123041]","authors":"A. Mollaebrahimi et al.","doi":"10.1016/j.nuclphysa.2025.123182","DOIUrl":"10.1016/j.nuclphysa.2025.123182","url":null,"abstract":"","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1063 ","pages":"Article 123182"},"PeriodicalIF":1.7,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144243575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of isoscalar- and isovector-meson mixing on properties of asymmetric nuclear matter in relativistic mean-field models","authors":"Tsuyoshi Miyatsu ,&nbsp;Myung-Ki Cheoun ,&nbsp;Kyungsik Kim ,&nbsp;Koichi Saito","doi":"10.1016/j.nuclphysa.2025.123183","DOIUrl":"10.1016/j.nuclphysa.2025.123183","url":null,"abstract":"<div><div>Using the relativistic mean-field model with the isoscalar- and isovector-meson mixing, <span><math><msup><mrow><mi>σ</mi></mrow><mrow><mn>2</mn></mrow></msup><msup><mrow><mi>δ</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> and <span><math><msub><mrow><mi>ω</mi></mrow><mrow><mi>μ</mi></mrow></msub><msup><mrow><mi>ω</mi></mrow><mrow><mi>μ</mi></mrow></msup><msub><mrow><mi>ρ</mi></mrow><mrow><mi>ν</mi></mrow></msub><msup><mrow><mi>ρ</mi></mrow><mrow><mi>ν</mi></mrow></msup></math></span>, we construct a new nuclear equation of state, which satisfies the large neutron skin thickness of ²⁰⁸Pb and the small radius of a neutron star, respectively reported by the PREX-2 experiment and the NICER observation. We study the effects of <em>δ</em> meson and <em>σ</em>-<em>δ</em> mixing on the properties of nuclear and neutron-star matter through the density dependence of nuclear symmetry energy, <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>sym</mi></mrow></msub></math></span>. It is found that the <em>δ</em> meson increases <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>sym</mi></mrow></msub></math></span> at high densities, while the <em>σ</em>-<em>δ</em> mixing softens <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>sym</mi></mrow></msub></math></span> above the saturation density to explain the tidal deformability of a neutron star observed from GW170817.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1063 ","pages":"Article 123183"},"PeriodicalIF":1.7,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fission studies using quasi-free NN scattering reactions in inverse kinematics","authors":"J. Benlliure ,&nbsp;G. García-Jiménez ,&nbsp;A. Graña González ,&nbsp;J.L. Rodriguez-Sanchez ,&nbsp;H. Alvarez-Pol ,&nbsp;L. Atar ,&nbsp;L. Audouin ,&nbsp;T. Aumann ,&nbsp;K. Boretzky ,&nbsp;L.T. Bott ,&nbsp;T. Brecelj ,&nbsp;C. Caesar ,&nbsp;E. Casarejos ,&nbsp;J. Cederkall ,&nbsp;A. Chatillon ,&nbsp;A. Corsi ,&nbsp;D. Cortina-Gil ,&nbsp;A. Cvetinović ,&nbsp;E. De Filippo ,&nbsp;A. Falduto ,&nbsp;F. Wienholtz","doi":"10.1016/j.nuclphysa.2025.123173","DOIUrl":"10.1016/j.nuclphysa.2025.123173","url":null,"abstract":"<div><div>The combined use of the inverse kinematics technique and the advanced detection setup R³B (Reactions with Relativistic Radioactive Beams) at GSI/FAIR provides unique opportunities to study the fission process. This approach provides access to the complete isotopic identification of the two fission fragments, the precise determination of their velocities and the measurement of the neutrons and gammas emitted in coincidence, for a wide range of unstable fissile nuclei. In addition, quasi-free NN scattering represents a surrogate reaction to induce fission, allowing the complete identification of the fissioning system in terms of isotopic composition and excitation energy. The manuscript describes the technical realisation of these experiments as well as the physics programme and some preliminary results.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1063 ","pages":"Article 123173"},"PeriodicalIF":1.7,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144243574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ground state properties and possible octupole deformations of Sr, Zr, Mo, and Ru isotopic chains within the covariant energy density functional theory","authors":"Yu-Ting Qiu,&nbsp;Jian-You Guo","doi":"10.1016/j.nuclphysa.2025.123181","DOIUrl":"10.1016/j.nuclphysa.2025.123181","url":null,"abstract":"<div><div>Reflection-asymmetric relativistic mean-field (RASRMF) theory is employed to systematically investigate the ground-state properties and the possible octupole deformations for the even-even Sr, Zr, Mo, and Ru isotopes with neutron number <span><math><mi>N</mi><mo>=</mo><mn>30</mn><mo>−</mo><mn>60</mn></math></span>. The calculated binding energies, quadrupole deformations, and charge radii agree with the experimental data as well as other theoretical calculations. Along all these chains, abrupt changes in the charge radius around <span><math><mi>N</mi><mo>=</mo><mn>58</mn></math></span> occur due to significant variations in the ground state deformation. Notably, no octupole-deformed ground states are found in the potential energy surfaces of the Sr, Zr, Mo, and Ru isotopes with <span><math><mi>N</mi><mo>≈</mo><mn>34</mn></math></span> and 56. The possible octupole-deformed nuclei are predicted in the light mass region with <span><math><mi>N</mi><mo>≈</mo><mi>Z</mi><mo>≈</mo><mn>40</mn></math></span>, which agrees with the results from both relativistic Hartree-Bogoliubov (RHB) and nonrelativistic Hartree-Fock-Bogoliubov (HFB) calculations. The experimental fingerprints of octupole correlations around <span><math><mi>N</mi><mo>=</mo><mn>40</mn></math></span> are convincing in the present calculations. In addition, we gain deeper insight into the octupole shape phase transition and shape coexistence within these isotopic chains.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1063 ","pages":"Article 123181"},"PeriodicalIF":1.7,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of resonances on 6,7Li+209Bi reactions at energy above the Coulomb barrier","authors":"L.V. Ndala,&nbsp;M.L. Lekala","doi":"10.1016/j.nuclphysa.2025.123184","DOIUrl":"10.1016/j.nuclphysa.2025.123184","url":null,"abstract":"<div><div>In this study, we look into the impact of resonances on the <span><math><mmultiscripts><mrow><mi>Li</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>6</mn><mo>,</mo><mn>7</mn></mrow></mmultiscripts><msup><mrow><mo>+</mo></mrow><mrow><mn>209</mn></mrow></msup><mrow><mi>Bi</mi></mrow></math></span> reactions at energies over the Coulomb barrier. The main purpose is to apply the Continuum Discretized Coupled Channels (CDCC) approach to analyze how resonant and non-resonant states affect angular distributions differentials and integrated breakup cross sections when both states are included from the coupling matrix elements. Our findings reveals that at lower angles (<span><math><mi>θ</mi><mo>≤</mo><msup><mrow><mn>50</mn></mrow><mrow><mo>∘</mo></mrow></msup></math></span>), non-resonant breakup cross sections are dominants while the resonant breakup cross sections at larger angles ((<span><math><mi>θ</mi><mo>≥</mo><msup><mrow><mn>50</mn></mrow><mrow><mo>∘</mo></mrow></msup></math></span>),) are prevailing for <span><math><mmultiscripts><mrow><mi>Li</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>6</mn></mrow></mmultiscripts><msup><mrow><mo>+</mo></mrow><mrow><mn>209</mn></mrow></msup><mrow><mi>Bi</mi></mrow></math></span> reaction. This is also observed for the <span><math><mmultiscripts><mrow><mi>Li</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>7</mn></mrow></mmultiscripts><msup><mrow><mo>+</mo></mrow><mrow><mn>209</mn></mrow></msup><mrow><mi>Bi</mi></mrow></math></span> reaction at greater angles (<span><math><mi>θ</mi><mo>≥</mo><msup><mrow><mn>50</mn></mrow><mrow><mo>∘</mo></mrow></msup></math></span>). Our results are in agreement with the Full integrated breakup cross sections and experimental data for <span><math><mmultiscripts><mrow><mi>Li</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>6</mn></mrow></mmultiscripts><msup><mrow><mo>+</mo></mrow><mrow><mn>209</mn></mrow></msup><mrow><mi>Bi</mi></mrow></math></span> reaction. This result is consistent with experimental data, even if it overestimates at incident energy below <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>c</mi><mi>m</mi></mrow></msub><mo>=</mo><mn>35</mn><mspace></mspace><mrow><mi>MeV</mi></mrow></math></span> for the <span><math><mmultiscripts><mrow><mi>Li</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>7</mn></mrow></mmultiscripts><msup><mrow><mo>+</mo></mrow><mrow><mn>209</mn></mrow></msup><mrow><mi>Bi</mi></mrow></math></span> reaction. We conclude that these resonant and non-resonant states have an impact on the integrated breakup cross sections and the differential angular distributions.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1063 ","pages":"Article 123184"},"PeriodicalIF":1.7,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure of negative-parity states in 71Ga","authors":"Amir Jalili ,&nbsp;H.T. Fortune ,&nbsp;Bingcheng He ,&nbsp;Yan-An Luo ,&nbsp;Hadi Sobhani ,&nbsp;Ai.Xi. Chen ,&nbsp;Feng Pan","doi":"10.1016/j.nuclphysa.2025.123185","DOIUrl":"10.1016/j.nuclphysa.2025.123185","url":null,"abstract":"<div><div>This study explores the investigation of negative parity states in the odd-A nucleus ⁷¹Ga. Specifically, we focus on analyzing E2 strengths connecting the initial two negative parity states (3/2⁻) to the first two negative parity states (7/2⁻). Our findings reveal distinct characteristics of these states, with the first 3/2⁻ state predominantly exhibiting ground band features (g), while the first 7/2⁻ state is associated with excited band properties (e). Through a comprehensive analysis of negative parity states, we establish a clear connection between the nature of these states and their corresponding E2 transition strengths.</div><div>This investigation contributes significant insights into the behaviour of negative parity states in odd-A nuclei, offering a nuanced perspective on the distinctive features of ground and excited bands in ⁷¹Ga. Our findings advance the understanding of nuclear structure, providing a valuable contribution to the broader field of nuclear physics.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1063 ","pages":"Article 123185"},"PeriodicalIF":1.7,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shell effects in quasi-fission: Reactions forming actinide and superheavy compound nuclei","authors":"C. Simenel ,&nbsp;K. Godbey ,&nbsp;H. Lee ,&nbsp;P. McGlynn ,&nbsp;A.S. Umar","doi":"10.1016/j.nuclphysa.2025.123170","DOIUrl":"10.1016/j.nuclphysa.2025.123170","url":null,"abstract":"<div><div>Quasi-fission occurs in fully damped heavy-ion collisions following a significant mass transfer between the fragments, without formation of a compound nucleus. As in fission, quasi-fission is expected to be affected by quantum effects leading to asymmetric mass splits. Quantum shells stabilising fission fragments with octupole shapes have been invoked as a factor determining the distribution of nucleons between the fragments at scission, explaining the fact that the centroid of the heavy fragment charge distribution is found around <span><math><mi>Z</mi><mo>=</mo><mn>54</mn></math></span> protons in fission and quasi-fission of actinides. These shell effects are studied in microscopic studies of quasi-fission. In particular, time-dependent Hartree-Fock (TDHF) calculations have been performed for reactions forming actinides.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123170"},"PeriodicalIF":1.7,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144146915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Excitation functions of (α,xn) reactions in natural Sb","authors":"Pankaj K. Giri ,&nbsp;Sandipan Dasgupta ,&nbsp;A. Sharma ,&nbsp;S. Kundu ,&nbsp;A. Das ,&nbsp;S.S. Ghugre ,&nbsp;G. Mukherjee ,&nbsp;S. Bhattacharyya ,&nbsp;J. Datta ,&nbsp;R. Raut","doi":"10.1016/j.nuclphysa.2025.123171","DOIUrl":"10.1016/j.nuclphysa.2025.123171","url":null,"abstract":"<div><div>This paper reports cross-section measurements of the <span><math><msup><mrow></mrow><mrow><mi>n</mi><mi>a</mi><mi>t</mi><mo>.</mo></mrow></msup></math></span>Sb(<em>α</em>,xn)^121,123,124I reactions, at energies <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>α</mi></mrow></msub></math></span> = 40-50 MeV, using the target activation technique. The experimental results have been compared with theoretical excitation functions calculated in the Talys-2.0 framework. The reaction model parameters such as the Optical Model Potential (OMP), Level Density (LD), Pre-equilibrium Emission (PE) and Photon Strength Function (PSF) have been optimized for maximum overlap between the calculated and the experimental cross sections. Such endeavors are expected to facilitate insights and understanding of the different reaction mechanisms and associated parameters that impact the yields of the products. The validated datasets, resulting therefrom, could go a long way in deciding on the conditions for producing radioisotopes of utility in varied domains such as medicine and industry.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123171"},"PeriodicalIF":1.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144146913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Macroscopic-microscopic analysis of deformation energy, Q20 electric quadrupole moments, and equilibrium shapes in even-even barium and cerium isotopes","authors":"Hadj Mouloudj ,&nbsp;Fethi Redjem ,&nbsp;Oussama Zeggai ,&nbsp;Mousaab Belarbi ,&nbsp;Youcef Belgaid ,&nbsp;Abdelkader Ghalem","doi":"10.1016/j.nuclphysa.2025.123172","DOIUrl":"10.1016/j.nuclphysa.2025.123172","url":null,"abstract":"<div><div>This study investigates the electric quadrupole moments (Q₂₀) and deformation energies of even-even nuclei within the mass range 114 ≤ <em>A</em> ≤ 140, focusing on Barium and Cerium isotopes. A macroscopic-microscopic approach is employed, combining the liquid drop model for macroscopic energy with Strutinsky shell corrections and BCS (<em>Bardeen-Cooper-Schrieffer</em>) pairing correlations for microscopic refinements. The shell corrections are derived by solving a Schrödinger equation with a deformed Woods–Saxon mean field. Numerical solutions, performed using an optimized FORTRAN program, identify equilibrium shapes by locating energy minima in deformation energy contour plots. From these equilibrium shapes, single-particle wave functions and the BCS approximation are used to calculate electric quadrupole moments. Theoretical results align closely with experimental data, confirming the robustness of the proposed model. This study advances our understanding of nuclear deformation and structure, particularly in isotopes far from spherical symmetry.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123172"},"PeriodicalIF":1.7,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144146912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}