Nuclear Physics A最新文献

{"title":"Microscopic insights into the structure of even-even 144−148Ce isotopes","authors":"Umera Nawaz ,&nbsp;Manvi Rajput ,&nbsp;Suram Singh ,&nbsp;G.H. Bhat ,&nbsp;Arun Bharti ,&nbsp;J.A. Sheikh","doi":"10.1016/j.nuclphysa.2025.123156","DOIUrl":"10.1016/j.nuclphysa.2025.123156","url":null,"abstract":"<div><div>A comprehensive analysis is done to study the structural evolution and triaxial deformation in the even-even ^144−148Ce isotopes using Triaxial Projected Shell Model (TPSM) approach. A thorough investigation of the yrast and <em>γ</em>-band explains the shape transition and presence of gamma collectivity in these neutron rich nuclei. Various observables and phenomena like <span><math><msub><mrow><mi>R</mi></mrow><mrow><mn>4</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> ratios, odd-even staggering patterns in <em>γ</em>-bands, shape invariants, reduced transition probabilities, g-factors etc. have been calculated and found to be reasonably consistent with the available experimental data. Also, these results reveal a progressive shape evolution from <em>γ</em>-soft towards axially symmetric rotor at N=90. This study enhances our understanding of nuclear deformation mechanisms in this critical mass region by revealing the structural changes driven by multiquasiparticle configurations.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1061 ","pages":"Article 123156"},"PeriodicalIF":1.7,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083809","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":"Probing the pygmy dipole resonance of 50Ca by Coulomb excitation","authors":"J. Lemarié ,&nbsp;Y. Togano ,&nbsp;T. Nakamura ,&nbsp;T. Kobayashi ,&nbsp;T. Aumann ,&nbsp;H. Baba ,&nbsp;K. Boretzky ,&nbsp;A. Bracco ,&nbsp;F. Browne ,&nbsp;F. Camera ,&nbsp;H. Chae ,&nbsp;S. Chan ,&nbsp;N. Chiga ,&nbsp;H. Choi ,&nbsp;L. Cortés ,&nbsp;F. Delaunay ,&nbsp;D. Dell'Aquila ,&nbsp;Z. Elekes ,&nbsp;Y. Fujino ,&nbsp;I. Gašparić ,&nbsp;K. Yoneda","doi":"10.1016/j.nuclphysa.2025.123152","DOIUrl":"10.1016/j.nuclphysa.2025.123152","url":null,"abstract":"<div><div>An experiment to measure the electric dipole response of ⁵⁰Ca by Coulomb excitation in inverse kinematics has been carried out at RIKEN - RIBF. The combination of the SAMURAI spectrometer, the <em>γ</em>-ray detector array CATANA and both NeuLAND demonstrator and NEBULA for neutron detection allow to reconstruct the excitation energy spectra by invariant mass spectroscopy.</div><div>The reaction channels ⁵⁰Ca → ⁴⁹Ca+n and ⁵⁰Ca → ⁴⁸Ca+n+n have been investigated. One sharp peak at low neutron relative energy for the 1 neutron emission channel may be a candidate for a Pygmy Dipole Resonance. Correlation of <em>γ</em>-ray and neutron energy shows possible structure effect in the decay of the ⁵⁰Ca projectile.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123152"},"PeriodicalIF":1.7,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069360","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":"Preliminary results on nuclear isomer production via laser-driven bremsstrahlung irradiation at ELI-NP-1PW","authors":"G. Giubega ,&nbsp;Y. Nakamiya ,&nbsp;F. D'Souza ,&nbsp;V.L.J. Phung ,&nbsp;I. Slabu ,&nbsp;V. Iancu ,&nbsp;L. Neagu ,&nbsp;J.F. Ong ,&nbsp;M. Dobre ,&nbsp;A. Balaceanu ,&nbsp;C. Vancea ,&nbsp;L. Tudor ,&nbsp;G. Cojocaru ,&nbsp;S. Norbaev ,&nbsp;A. Naziru ,&nbsp;L. Vasescu ,&nbsp;A. Toma ,&nbsp;A. Dumitru ,&nbsp;A. Berceanu ,&nbsp;M. Rosu ,&nbsp;O. Tesileanu","doi":"10.1016/j.nuclphysa.2025.123157","DOIUrl":"10.1016/j.nuclphysa.2025.123157","url":null,"abstract":"<div><div>In this contribution we present the preliminary results regarding laser-driven nuclear isomer-production obtained during the commissioning of 1 PW-E7 experimental area at ELI-NP. The study of nuclear isomers production and their photoreactions has been a subject of lasting interest in the nuclear physics community. Nuclear isomers play a crucial role in the creation of the elements in the Universe and in controlled nuclear energy release. The high-intensity and ultra-short pulsed lasers, available at ELI-NP facility, have a great advantage for studying isomeric states with life-times that are impractical to investigate by using conventional accelerator or nuclear reactor experiments. The 1 PW high-power laser was focused on 1 mm supersonic gas jet (mixture of 98% He-2% N₂) at laser pulse energy on target of E<span><math><msub><mrow></mrow><mrow><mi>L</mi><mi>o</mi><mi>n</mi><mi>T</mi></mrow></msub></math></span>≈20 J in order to generate electron bunches via the Laser Wakefield Acceleration. Electrons with energies up to 500 MeV were obtained at laser intensity on target of 2-2.5x10²⁰ W/cm² and 10 bar backing pressure of 98% He-2% N₂ gas jets. Intense bremsstrahlung radiation was further generated by impinging the laser-accelerated-electrons on a 10-mm-thick ¹⁸¹Ta photo-converter placed before the natural In target. Several indium isomers were produced using the laser-driven bremsstrahlung irradiation, e.g. <span><math><msup><mrow></mrow><mrow><mn>113</mn><mi>m</mi></mrow></msup></math></span>In, <span><math><msup><mrow></mrow><mrow><mn>115</mn><mi>m</mi></mrow></msup></math></span>In and <span><math><msup><mrow></mrow><mrow><mn>116</mn><mi>m</mi></mrow></msup></math></span>In.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123157"},"PeriodicalIF":1.7,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948786","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":"Detector developments for HISPEC/DESPEC collaboration at the Slovenian Nuclear Instrumentation Laboratory","authors":"J. Vesic ,&nbsp;G. Kosir ,&nbsp;M. Vencelj ,&nbsp;K. Zagar ,&nbsp;E. Lovsin ,&nbsp;HISPEC/DESPEC collaboration","doi":"10.1016/j.nuclphysa.2025.123159","DOIUrl":"10.1016/j.nuclphysa.2025.123159","url":null,"abstract":"<div><div>In this paper, we aim to present the detector developments for the HISPEC/DESPEC (HIgh-resolution in-flight SPECtroscopy/DEcay SPECtroscopy) collaboration at the Slovenian Nuclear Instrumentation Laboratory. The <span><math><mi>Δ</mi><mi>E</mi><mo>−</mo><mi>E</mi></math></span> telescope array will be one of the crucial tracking detectors of the HISPEC-10 campaign. A prototype of the <span><math><mi>Δ</mi><mi>E</mi><mo>−</mo><mi>E</mi></math></span> telescope was constructed along with its cooling. For fast timing measurements, a time resolution of the implantation detectors better than 1 ns and the capability to detect and distinguish between ion implantation and subsequent decays are needed. Scintillating fibres are used for a Fibre IMPlanter (FIMP) to fulfil these requirements. DEGAS (DEspec Germanium Array Spectrometer) is a key instrument of DESPEC and is planned to be operated in most future experimental campaigns. To further improve the sensitivity of the array, shielding of the environmental background with active and passive components is planned. Shielding directly behind the HPGe detectors is based on the BGO scintillation detectors. The BGO detector was characterized, and its performance was compared with a simple gamma-ray propagation simulation.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123159"},"PeriodicalIF":1.7,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949032","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":"Influence of the rearrangement contribution of single-particle potential to the nucleus-nucleus interaction and its impact on fusion cross section","authors":"W.M. Seif ,&nbsp;A. Adel ,&nbsp;F.A. Fareed","doi":"10.1016/j.nuclphysa.2025.123153","DOIUrl":"10.1016/j.nuclphysa.2025.123153","url":null,"abstract":"<div><div>We investigate the impact of the single-particle (SP) rearrangement correction of the nucleon optical potential on the interaction potential between two fusing nuclei and on their fusion cross-section. The nucleus-nucleus potential is calculated using the double-folding model based on effective CDM3Y-Reid and Paris nucleon-nucleon (NN) interaction with an isovector density dependence that is parameterized taking into accounts the rearrangement correction to the single-particle potential. It is also calculated using the energy-density formalism based on Skyrme nucleon-nucleon interaction with parameters are obtained with included rearrangement contribution. We found that the influence of the rearrangement contribution on the nucleus-nucleus potential depends on both the relative strength of the attractive part of the considered NN potential and the isospin-asymmetry of the interacting system. The rearrangement correction decreases the indicated neutron radius and neutron-skin thickness of neutron-rich nuclei. The isospin-asymmetry value at which the rearrangement contribution shifts up the indicated Coulomb barrier, hindering the fusion cross-section, decreases with decreasing the negativity of attractive part of the NN potential, the strengths of its density dependence and spin–orbit terms, as well as it related symmetry-energy coefficients.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123153"},"PeriodicalIF":1.7,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069358","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":"Observation of 12C(d,p)13C and 12C(d,d)12C reactions cross sections enhancement at MeV energy","authors":"H. Salah ,&nbsp;B. Touchrift ,&nbsp;M. Makhloufi","doi":"10.1016/j.nuclphysa.2025.123160","DOIUrl":"10.1016/j.nuclphysa.2025.123160","url":null,"abstract":"<div><div>We report an unexpected observation of ¹²C(d,p)¹³C and ¹²C(d,d)¹²C cross sections enhancement at 1200 keV incident energy. Both enhancement and lowering of the reactions yields were observed when (C₂H₄)n polymer was irradiated with low beam intensity. Enhancement factors of 2.50±0.05 and 1.13±0.02 were obtained respectively for diffusion and nuclear reaction cross sections.</div><div>These results were obtained using a different experimental method than the usually employed which consists of irradiating (C₂H₄)n target and recording the energy spectra in a single experiment, minimizing then experimental errors. A qualitative description involving nuclear processes is suggested in an attempt to understand the obtained results.</div><div>We believe that these findings may contribute to provide insight to understanding the published suggestions concerning the involvement of target effects in screening phenomenon.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123160"},"PeriodicalIF":1.7,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072248","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":"Investigating the structure of 11B using particle-γ coincidences","authors":"S. Bottoni ,&nbsp;G. Corbari ,&nbsp;S. Leoni ,&nbsp;B. Fornal ,&nbsp;A. Goasduff ,&nbsp;S. Capra ,&nbsp;D. Mengoni ,&nbsp;E. Albanese ,&nbsp;S. Ziliani ,&nbsp;G. Benzoni ,&nbsp;A.M. Sánchez-Benítez ,&nbsp;A. Bracco ,&nbsp;D. Brugnara ,&nbsp;F. Camera ,&nbsp;M. Ciemała ,&nbsp;N. Cieplicka-Oryńczak ,&nbsp;F.C.L. Crespi ,&nbsp;J.A. Dueñas ,&nbsp;A. Gadea ,&nbsp;F. Galtarossa ,&nbsp;G. Zhang","doi":"10.1016/j.nuclphysa.2025.123138","DOIUrl":"10.1016/j.nuclphysa.2025.123138","url":null,"abstract":"<div><div>The structure of ¹¹B was investigated at Legnaro National Laboratories of INFN using the ⁶Li(⁶Li,p<em>γ</em>) fusion-evaporation reaction. Emitted protons feeding excited states of ¹¹B were detected by the GALTRACE silicon telescopes in coincidence with <em>γ</em> rays measured by the GALILEO HPGe array. The level and <em>γ</em>-decay scheme of ¹¹B was reconstructed on an even-by-event basis by combining particle and <em>γ</em>-ray spectroscopy techniques. In particular, the <em>γ</em> decay from the possible near-threshold proton resonance was searched for, providing first results on its <em>γ</em>-ray branch with a 5<em>σ</em> and 3<em>σ</em> confidence level. Results are discussed along with predictions of the Shell Model Embedded in the Continuum (SMEC).</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123138"},"PeriodicalIF":1.7,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069359","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":"Short-range correlations in dynamical intranuclear cascade models for describing single-nucleon knockout and quasi-free (p,2p) fission reactions","authors":"J.L. Rodríguez-Sánchez ,&nbsp;J. Cugnon ,&nbsp;J.-C. David ,&nbsp;G. García-Jiménez ,&nbsp;A. Graña-González ,&nbsp;J. Hirtz","doi":"10.1016/j.nuclphysa.2025.123155","DOIUrl":"10.1016/j.nuclphysa.2025.123155","url":null,"abstract":"<div><div>The dynamical intranuclear cascade model INCL has been improved by including short-range nucleon-nucleon correlations (SRCs), which are mainly dominated by the formation of np pairs. This new development allows us to obtain a better description of peripheral collisions involving the knockout of a few nucleons in spallation and fragmentation reactions when INCL is coupled to de-excitation model ABLA. The new version of our dynamical model successfully describes inclusive single-neutron and single-proton knockout cross sections for various stable and exotic nuclei. The results show that the systematic strong dependence of the single-knockout cross section reduction factor on the neutron-proton separation energy asymmetry parameter obtained by Tostevin and Gade disappears when SRCs are taken into account. INCL+ABLA are also used to study the evolution of the quasi-free (p,2p)-fission cross section with the neutron excess or mass number (A) for exotic heavy nuclei.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1061 ","pages":"Article 123155"},"PeriodicalIF":1.7,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943515","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":"Neutron dripline search for fluorine, neon and sodium and the discovery of 39Na at RIKEN RIBF","authors":"Toshiyuki Kubo,&nbsp;RIKEN RIBF new isotope collaboration","doi":"10.1016/j.nuclphysa.2025.123154","DOIUrl":"10.1016/j.nuclphysa.2025.123154","url":null,"abstract":"<div><div>Experiments to search for new fluorine, neon and sodium isotopes near the neutron dripline were conducted at the RIKEN Nishina Center RI Beam Factory. Isotopes were produced by projectile fragmentation of an intense ⁴⁸Ca beam at 345 MeV/nucleon, and separated and identified in flight using the large-acceptance two-stage separator BigRIPS. We determined the neutron dripline at fluorine and neon to be ³¹F and ³⁴Ne, respectively and discovered an extremely neutron-rich isotope ³⁹Na with neutron number <em>N</em> = 28. The results provide new keys to understanding nuclear binding and underlying nuclear structure in this extremely neutron-rich region. An overview of the experiments and a discussion of the underlying nuclear structure are presented.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123154"},"PeriodicalIF":1.7,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948785","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":"Investigation of excited-state quantum phase transitions in the U(5)↔SO(6) transitional region by the recurrence formula and Jacobi matrix","authors":"Z. Mollaei,&nbsp;M.A. Jafarizadeh,&nbsp;N. Amiri,&nbsp;N. Fouladi","doi":"10.1016/j.nuclphysa.2025.123143","DOIUrl":"10.1016/j.nuclphysa.2025.123143","url":null,"abstract":"<div><div>In this paper, we have theoretically studied the Excited State Quantum Phase Transition <span><math><mo>(</mo><mi>E</mi><mi>S</mi><mi>Q</mi><mi>P</mi><mi>T</mi><mo>)</mo></math></span>. For this purpose, based on the formulas of the inverse relation and the Jacobian matrix from the theory of orthogonal polynomials, we have presented a numerical solution for the model transition between the two phases <span><math><mi>U</mi><mo>(</mo><mn>5</mn><mo>)</mo></math></span> and <span><math><mi>O</mi><mo>(</mo><mn>6</mn><mo>)</mo></math></span>. We have obtained the energy spectrum of the excited states for the given <em>N</em> and we have observed the transition region well in it. One of the prominent features of the energy spectrum is that for a given <em>N</em>, all the excited states are acquired. The absence of level crossing between levels is another characteristic of the spectrum, the reason for which can be proven using orthogonal polynomials. In addition, the expected value of the number of bosons and the ratio of the energy gaps have been studied, yielding good results in relation to them.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1062 ","pages":"Article 123143"},"PeriodicalIF":1.7,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084711","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}