Nuclear Physics A最新文献

{"title":"Review of nuclear structure N=86–118 of W isotopes","authors":"J.B. Gupta ,&nbsp;Vikas Katoch","doi":"10.1016/j.nuclphysa.2025.123032","DOIUrl":"10.1016/j.nuclphysa.2025.123032","url":null,"abstract":"<div><div>Nuclear structure of N = 86–118 W isotopes in even <em>Z</em> even N contains ground state band K^π=0⁺, K^π=0⁺ β-band and K^π=2⁺ γ-band. The energy <em>E</em>(2₁⁺) for spin I^π=2⁺ of ground state band shows minima at neutron number N = 108, which indicates shape phase transition. The energy ratio <em>R</em>_4/2 is maximum at N = 108 having nearly rotational symmetry and showed shape phase transition. The Power index ‘b’ in <em>E</em>=aI^b, shows minimum to maximum from N = 88 to N = 108 and again decreasing up to N = 116. The electromagnetic transition strength <strong><em>B</em>(<em>E2</em>)↑</strong> varies linearly with [1/ <em>E</em>(2₁⁺)]. The γ-band head difference with <em>E</em>(4₁⁺) is maximum at N = 108 and decreases for higher N, coming closer to the ground band. The band structure of W isotopes N = 108 to N = 112 is studied with the interacting boson model (IBM) and compared with experimental energies. Here the shape phase transitions, both sides of neutron number N = 108 ¹⁸²W is analyzed.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1057 ","pages":"Article 123032"},"PeriodicalIF":1.7,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465345","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":"Particle-coupled octupole collectivity in 91Zr","authors":"P. Dey ,&nbsp;R. Palit ,&nbsp;E. Ideguchi ,&nbsp;T. Inakura ,&nbsp;F.S. Babra ,&nbsp;Biswajit Das ,&nbsp;U. Garg ,&nbsp;S.V. Jadhav ,&nbsp;A.K. Jain ,&nbsp;A. Kundu ,&nbsp;Md.S.R. Laskar ,&nbsp;B. Maheshwari ,&nbsp;Vishal Malik ,&nbsp;B.S. Naidu ,&nbsp;D. Negi ,&nbsp;S. Sihotra ,&nbsp;A.T. Vazhappilly","doi":"10.1016/j.nuclphysa.2025.123035","DOIUrl":"10.1016/j.nuclphysa.2025.123035","url":null,"abstract":"<div><div>Excited states in the semi-magic ⁹¹Zr nucleus have been populated by the heavy-ion fusion-evaporation reaction ⁸²Se(¹³C, 4<em>n</em>) at 52 MeV beam energy for investigating the phenomenon of octupole collectivity in odd-<em>A</em> nuclei. The half-life of the <span><math><mn>11</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>−</mo></mrow></msup></math></span> state at 2170.8 keV excitation energy has been measured by the electronic fast-timing technique using a hybrid array of clover HPGe and LaBr₃(Ce) detectors, and is found to be <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mi>expt</mi></mrow></msup><mo>=</mo><mn>791.6</mn><mo>±</mo><mn>44.1</mn></math></span> ps. The reduced <em>E</em>3 transition probability <span><math><mi>B</mi><mo>(</mo><mi>E</mi><mn>3</mn><mo>;</mo><mn>11</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><mn>5</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>)</mo><mo>=</mo><mn>18.5</mn><mo>±</mo><mn>1.2</mn></math></span> W.u. is significant and confirms its collective nature. The experimentally obtained <span><math><mi>B</mi><mo>(</mo><mi>E</mi><mn>3</mn><mo>)</mo></math></span> value along with the excitation energy of particle-coupled octupole state is well reproduced in the theoretical calculations performed using random-phase approximation with three different interactions. In contrast to ⁹⁰Zr where the large <span><math><mi>B</mi><mo>(</mo><mi>E</mi><mn>3</mn><mo>)</mo></math></span> value is made mainly by proton particle-hole excitations, the change in the <span><math><mi>B</mi><mo>(</mo><mi>E</mi><mn>3</mn><mo>)</mo></math></span> value in ⁹¹Zr is due to the valence neutron density of <span><math><mn>2</mn><msub><mrow><mi>d</mi></mrow><mrow><mn>5</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> orbital to <span><math><mn>1</mn><msub><mrow><mi>h</mi></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> orbital.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1057 ","pages":"Article 123035"},"PeriodicalIF":1.7,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454851","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":"Towards next-generation optical potentials for nuclear reactions and structure calculations","authors":"Salvatore Simone Perrotta,&nbsp;Cole Davis Pruitt,&nbsp;Oliver C. Gorton,&nbsp;Jutta E. Escher","doi":"10.1016/j.nuclphysa.2025.123037","DOIUrl":"10.1016/j.nuclphysa.2025.123037","url":null,"abstract":"<div><div>Optical-model potentials (OMPs) are critical ingredients for basic and applied nuclear physics. Present-day computational capabilities allow us to generate data-driven nucleon-nucleus OMPs that are non-local and exactly dispersive (as theoretically required to be), include statistically-sound uncertainty quantification, and are trained on both scattering and bound-state data from a wide area of the nuclear chart. Combined together, these features allow for significant improvement in fidelity and extrapolative power of the model. Here, we present preliminary work toward the development and training of such an OMP. The capability of the model to describe data at this first stage is encouraging.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1057 ","pages":"Article 123037"},"PeriodicalIF":1.7,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454163","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":"Direct local parametrization of nuclear state densities using the back-shifted Bethe formula","authors":"C. Özen ,&nbsp;Y. Alhassid","doi":"10.1016/j.nuclphysa.2025.123034","DOIUrl":"10.1016/j.nuclphysa.2025.123034","url":null,"abstract":"<div><div>Level densities are often parametrized using the back-shifted Bethe formula (BBF) for nuclei that have experimental data for s-wave neutron resonance average spacings and a complete discrete level sequence at low excitation energies. However, these parametrizations require additional modeling of the dependence of the spin-cutoff parameter on excitation energy. Here we avoid the need to model the spin distribution of level densities by using the experimental data to parametrize directly the state densities, for which the BBF does not depend on the spin-cutoff parameter. This approach allows for a local parameterization of state densities that is independent of the spin-cutoff parameter. We provide these parameters in a tabulated form for applications in nuclear reaction calculations and for testing microscopic approaches to state densities.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1058 ","pages":"Article 123034"},"PeriodicalIF":1.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552275","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":"First observation of MNT isotope beams at the FRS Ion Catcher","authors":"Ali Mollaebrahimi ,&nbsp;Paul Constantin ,&nbsp;Timo Dickel ,&nbsp;Daler Amanbayev ,&nbsp;Simeon Glöckner ,&nbsp;Emma Haettner ,&nbsp;Debodyuti Kar ,&nbsp;Gabriella Kripko-Koncz ,&nbsp;Deepak Kumar ,&nbsp;Kriti Mahajan ,&nbsp;Israel Mardor ,&nbsp;David Morrissey ,&nbsp;Meetika Narang ,&nbsp;Wolfgang R. Plaß ,&nbsp;Amir Shrayer ,&nbsp;Nazarena Tortorelli ,&nbsp;Jiajun Yu ,&nbsp;Jasmiina Ahokas ,&nbsp;Beatriz Amorim ,&nbsp;Samuel Ayet San Andrés ,&nbsp;Jianwei Zhao","doi":"10.1016/j.nuclphysa.2025.123041","DOIUrl":"10.1016/j.nuclphysa.2025.123041","url":null,"abstract":"<div><div>An exploratory experiment on Multi-Nucleon Transfer (MNT) reactions was successfully conducted at the FRS Ion Catcher setup at GSI. The experiment demonstrated the production of MNT-driven radioactive ion beams (RIBs) produced by decelerated relativistic beams. A beam of ²³⁸U ions was reacted with a ²⁰⁹Bi target at near-Coulomb barrier energies inside the specially modified Cryogenic Stopping Cell (CSC) for the production and thermalization of MNT products. These products were then identified using a Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS). The observation of target-like MNT fragments along the <span><math><mi>A</mi><mo>=</mo><mn>211</mn></math></span> isobaric chain provided a proof-of-principle for future MNT studies with the FRS Ion Catcher setup.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1057 ","pages":"Article 123041"},"PeriodicalIF":1.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cross-shell excited states in 32Si and 29Al populated using fusion-evaporation","authors":"J. Williams ,&nbsp;G. Hackman ,&nbsp;K. Starosta ,&nbsp;R.S. Lubna ,&nbsp;Priyanka Choudhary ,&nbsp;S. Sahoo ,&nbsp;P.C. Srivastava ,&nbsp;C. Andreoiu ,&nbsp;D. Annen ,&nbsp;H. Asch ,&nbsp;M.D.H.K.G. Badanage ,&nbsp;G.C. Ball ,&nbsp;M. Beuschlein ,&nbsp;H. Bidaman ,&nbsp;V. Bildstein ,&nbsp;R. Coleman ,&nbsp;A.B. Garnsworthy ,&nbsp;B. Greaves ,&nbsp;G. Leckenby ,&nbsp;V. Karayonchev ,&nbsp;Z. Yu","doi":"10.1016/j.nuclphysa.2025.123042","DOIUrl":"10.1016/j.nuclphysa.2025.123042","url":null,"abstract":"<div><div>In the neutron-rich <em>sd</em> shell near the <span><math><mi>N</mi><mo>=</mo><mn>20</mn></math></span> ‘island of inversion’, the evolution of the <span><math><mi>N</mi><mo>=</mo><mn>20</mn></math></span> shell gap is indicated by the energies of negative-parity states which primarily arise due to single neutron excitation to higher lying orbitals across the shell gap. These negative-parity states often have high spin (due to the participation of the <span><math><mn>0</mn><msub><mrow><mi>f</mi></mrow><mrow><mn>7</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> orbital) and are therefore preferentially populated using fusion-evaporation reactions. We have studied the intermediate energy levels of ³²Si and ²⁹Al using ¹²C(²²Ne,2p) and ¹²C(²²Ne,<em>α</em>p) reactions, identifying several negative-parity states in both nuclides.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1057 ","pages":"Article 123042"},"PeriodicalIF":1.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427632","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":"Development of the detector array for photons, protons, and exotic residues","authors":"A.B. McIntosh ,&nbsp;A.D. Abbott ,&nbsp;M.Q. Sorensen ,&nbsp;K. Hagel ,&nbsp;A. Couture ,&nbsp;J. Gauthier ,&nbsp;S. Ota ,&nbsp;A. Alvarez ,&nbsp;S. Balakrishnan ,&nbsp;R. Ghimire ,&nbsp;M. Grinder ,&nbsp;I. Jeanis ,&nbsp;T. King ,&nbsp;L.A. McIntosh ,&nbsp;S. Mosby ,&nbsp;S.D. Pain ,&nbsp;C. Prokop ,&nbsp;A. Ratkiewicz ,&nbsp;S. Regener ,&nbsp;A. Rodriguez-Manso ,&nbsp;S.J. Yennello","doi":"10.1016/j.nuclphysa.2025.123038","DOIUrl":"10.1016/j.nuclphysa.2025.123038","url":null,"abstract":"<div><div>Accurate neutron capture predictions are needed in fundamental and applied science. Empirical models are constrained largely for stable nuclei, but predictions far from stability are needed. Neutron transfer in (d, p) reactions in inverse kinematics with rare isotope beams offers a means to access key aspects of the capture process. To this end, the detector array for photons, protons, and exotic residues (DAPPER) has been designed, built, tested, and used for measurement at Texas A&amp;M University.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1057 ","pages":"Article 123038"},"PeriodicalIF":1.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445542","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":"Calculation of harmonic oscillator brackets in SU(3) basis","authors":"Ramutis Kazys Kalinauskas ,&nbsp;Augustinas Stepšys ,&nbsp;Darius Germanas ,&nbsp;Saulius Mickevičius","doi":"10.1016/j.nuclphysa.2025.123033","DOIUrl":"10.1016/j.nuclphysa.2025.123033","url":null,"abstract":"<div><div>We present a new approach for the Talmi-Moshinsky transformation representation in the harmonic oscillator basis. We utilize the SU(3) scheme for calculation of harmonic oscillator brackets. Using this scheme we obtain the explicit relations for numeric evaluation and present a computational approach.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1056 ","pages":"Article 123033"},"PeriodicalIF":1.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422742","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":"Re-evaluation of the 26Si(p,γ)27P astrophysical reaction rate","authors":"Ashok Kumar Mondal,&nbsp;Sathi Sharma","doi":"10.1016/j.nuclphysa.2025.123031","DOIUrl":"10.1016/j.nuclphysa.2025.123031","url":null,"abstract":"<div><div>In this work, we re-evaluate the reaction rate for the ²⁶Si(p,<em>γ</em>)²⁷P process, motivated by discrepancies in previous studies regarding key parameters such as <span><math><msub><mrow><mi>Γ</mi></mrow><mrow><mi>γ</mi></mrow></msub></math></span>, <span><math><msub><mrow><mi>Γ</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span>, <em>ωγ</em>, and the S - factor at zero energy, S(0). Using the NuShellX code with the newly developed USDCm interaction <span><span>[20]</span></span>, we performed shell model calculations to reproduce energy levels and calculate spectroscopic factors for various states. The gamma width (<span><math><msub><mrow><mi>Γ</mi></mrow><mrow><mi>γ</mi></mrow></msub></math></span>) values for the 3/2⁺ and 5/2⁺ states were determined using shell model calculations. Additionally, we employed the WSPOT code to analyze scattering cross-sections and phase shifts to compute the proton width (<span><math><msub><mrow><mi>Γ</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span>) values. After that, we have calculated the resonance strength (<em>ωγ</em>) values for 3/2⁺ and 5/2⁺ states respectively. Here, we have utilized the RADCAP code to calculate the S - factor at zero energy, S(0). Finally, we computed the reaction rates across a temperature range of 0.1 - 2 GK. Our results provide a refined understanding of the ²⁶Si(p,<em>γ</em>)²⁷P reaction rate, addressing inconsistencies in previous studies.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1056 ","pages":"Article 123031"},"PeriodicalIF":1.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395325","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":"Upper bounds on the production cross section of toroidally deformed nuclei","authors":"A. Hannaman ,&nbsp;B. Harvey ,&nbsp;K. Hagel ,&nbsp;A.B. McIntosh ,&nbsp;A. Abbott ,&nbsp;L. Bills ,&nbsp;A. Fentress ,&nbsp;J. Gauthier ,&nbsp;T. Hankins ,&nbsp;Y.-W. Lui ,&nbsp;L.A. McIntosh ,&nbsp;S. Regener ,&nbsp;R. Rider ,&nbsp;S. Schultz ,&nbsp;M.Q. Sorensen ,&nbsp;J. Tobar ,&nbsp;Z. Tobin ,&nbsp;S. Yennello","doi":"10.1016/j.nuclphysa.2025.123024","DOIUrl":"10.1016/j.nuclphysa.2025.123024","url":null,"abstract":"<div><div>Ground state nuclei usually have compact geometries. However, there have been theoretical predictions that excited nuclei can take on more extended shapes such as toroids or bubbles. There have been many attempts to identify signatures of such shapes in experimental data. One signature, both predicted by theory and sought by experimental data, is narrow resonances at high excitation energy in peripheral intermediate-energy heavy-ion collisions. Potential evidence for toroidal states was reported in the alpha particle disassembly of ²⁸Si after collision with a ¹²C target at 35 MeV/nucleon. The prior work was limited by angular resolution and statistical uncertainties. The present work aims to measure the excitation energy distribution for these disassembly events with improved angular resolution and reduced statistical uncertainty using the Forward Array Using Silicon Technology (FAUST). FAUST is equipped with resistive dual-axis duo-lateral (DADL) position-sensitive silicon detectors capable of sub-millimeter position resolution. The measured excitation energy distributions of 7-<em>α</em> disassembly events showed no strong evidence for highly excited states at the cross section and widths suggested by previous experiment. A statistical likelihood analysis was performed to provide an upper limit to toroidal high-spin isomer cross section, as evidenced by this observable, as a function of the excitation energy and width of potential states.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1056 ","pages":"Article 123024"},"PeriodicalIF":1.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387320","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}