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The challenging first direct measurement of the 65 keV resonance strength in the 17O(p,γ)18F reaction at LUNA LUNA的17O(p,γ)18F反应中65 keV共振强度的首次直接测量
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2025-04-14 DOI: 10.1016/j.nuclphysa.2025.123099
D. Piatti, LUNA collaboration
{"title":"The challenging first direct measurement of the 65 keV resonance strength in the 17O(p,γ)18F reaction at LUNA","authors":"D. Piatti,&nbsp;LUNA collaboration","doi":"10.1016/j.nuclphysa.2025.123099","DOIUrl":"10.1016/j.nuclphysa.2025.123099","url":null,"abstract":"<div><div>A precise determination of the proton capture rates on oxygen is mandatory to predict the abundance ratios of oxygen isotopes in a stellar environment where the hydrogen burning is active. The <sup>17</sup>O(p,<em>γ</em>)<sup>18</sup>F reaction, in particular, plays a crucial role in AGB nucleosynthesis as well as in explosive hydrogen burning occurring in novae and type I supernovae. At the temperature of interest for the former scenario (20 MK ≤ T ≤ 80 MK) the main contribution to the astrophysical reaction rate comes from the <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>r</mi></mrow></msub></math></span> = 64.5 keV resonance. The strength of this resonance is presently determined only through indirect measurements, with an adopted value <em>ωγ</em> = (1.6 ± 0.3) × 10<sup>−11</sup> eV. A new high sensitivity setup has been installed at LUNA, located at Laboratori Nazionali del Gran Sasso. The underground location of LUNA 400kV guarantees a reduction of the cosmic ray background by several orders of magnitude. The residual background was further reduced by a dedicated shielding. On the other hand the 4<em>π</em>-BGO detector efficiency was optimized installing an aluminum target chamber and holder. With about 400 C accumulated on Ta<sub>2</sub>O<sub>5</sub> targets, with nominal <sup>17</sup>O enrichment of 90%, the LUNA collaboration has performed the first ever direct measurement of the 64.5 keV resonance strength.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123099"},"PeriodicalIF":1.7,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860490","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}
引用次数: 0
First in-beam experiment in K500 superconducting cyclotron at VECC 中心K500超导回旋加速器首次束流实验
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123101
T.K. Rana , Samir Kundu , S. Manna , K. Banerjee , P. Karmakar , T.K. Ghosh , G. Mukherjee , A. Sen , R. Pandey , P. Pant , Pratap Roy , R. Shil , S.S. Nayak , K. Rani , K. Atreya , D. Paul , R. Santra , A. Sultana , S. Pal , S. Basu , M.K. Dey
{"title":"First in-beam experiment in K500 superconducting cyclotron at VECC","authors":"T.K. Rana ,&nbsp;Samir Kundu ,&nbsp;S. Manna ,&nbsp;K. Banerjee ,&nbsp;P. Karmakar ,&nbsp;T.K. Ghosh ,&nbsp;G. Mukherjee ,&nbsp;A. Sen ,&nbsp;R. Pandey ,&nbsp;P. Pant ,&nbsp;Pratap Roy ,&nbsp;R. Shil ,&nbsp;S.S. Nayak ,&nbsp;K. Rani ,&nbsp;K. Atreya ,&nbsp;D. Paul ,&nbsp;R. Santra ,&nbsp;A. Sultana ,&nbsp;S. Pal ,&nbsp;S. Basu ,&nbsp;M.K. Dey","doi":"10.1016/j.nuclphysa.2025.123101","DOIUrl":"10.1016/j.nuclphysa.2025.123101","url":null,"abstract":"<div><div>Characterization of first beam from <em>K</em>500 cyclotron at VECC, Kolkata, was performed using the elastic scattering experiment with a <sup>197</sup>Au target. Two independent approaches have been used to calibrate the detector system to estimate beam energy and its energy spread. Apart from the beam characterization, the fragment emission mechanism, particularly the isospin equilibrium and isoscaling behaviour, has been studied using <sup>14</sup>N, <sup>16</sup>O and <sup>20</sup>Ne beams from the cyclotron. This article provides details of the beam characterization of the cyclotron and also an overview of the experiments conducted.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123101"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838771","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}
引用次数: 0
Development of a PID algorithm for the CALIFA detector to study multinucleon knockout reactions in exotic nuclei 开发用于 CALIFA 探测器的 PID 算法，以研究奇异原子核中的多核子敲除反应
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123103
M. Feijoo-Fontán , A. Barrière , N. Mozumdar , H. Álvarez-Pol , J.L. Rodríguez-Sánchez , O. Sorlin , J. Benlliure , D. Cortina-Gil , R3B collaboration
{"title":"Development of a PID algorithm for the CALIFA detector to study multinucleon knockout reactions in exotic nuclei","authors":"M. Feijoo-Fontán ,&nbsp;A. Barrière ,&nbsp;N. Mozumdar ,&nbsp;H. Álvarez-Pol ,&nbsp;J.L. Rodríguez-Sánchez ,&nbsp;O. Sorlin ,&nbsp;J. Benlliure ,&nbsp;D. Cortina-Gil ,&nbsp;R3B collaboration","doi":"10.1016/j.nuclphysa.2025.123103","DOIUrl":"10.1016/j.nuclphysa.2025.123103","url":null,"abstract":"<div><div>Previous studies have shown a reduction in cross sections relative to theoretical predictions for single-nucleon knockout reactions, with varying conclusions about the dependence of this reduction on the N/Z ratio of the projectile. The (p,pX) knockout reactions studied with the R<sup>3</sup>B setup offer a unique opportunity for kinematically complete measurements using inverse kinematics. This work focuses on the development of an algorithm for performing particle identification using the CALIFA detector, of vital importance for the study of knocked-out clusters such as deuterium.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1059 ","pages":"Article 123103"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826094","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}
引用次数: 0
Research on superheavy elements: Experimental prospects 超重元素的研究：实验展望
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123097
Dirk Rudolph
{"title":"Research on superheavy elements: Experimental prospects","authors":"Dirk Rudolph","doi":"10.1016/j.nuclphysa.2025.123097","DOIUrl":"10.1016/j.nuclphysa.2025.123097","url":null,"abstract":"<div><div>What are the heaviest elements that can exist in Nature or be created on Earth? Does an ‘Island of Stability’ exist beyond uranium? Questions like these are often asked in connection with Long Range Plans of nuclear physics communities or large-scale accelerator facilities. Information on the chemical and physical properties of superheavy elements (<span><math><mi>Z</mi><mo>&gt;</mo><mn>103</mn></math></span>) or nuclei is notoriously difficult to collect, mainly because of tiny production and thus observation rates. This in turn limits experimental constraints of nuclear structure theory in particular. A selection of ongoing efforts and future possibilities to improve the experimental situation are presented. Nuclear theory is asked to anchor model predictions on already existing nuclear structure data in the superheavy region.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123097"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825725","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}
引用次数: 0
Neural network-based prediction of particle-induced fission cross sections for r-process nucleosynthesis trained with dynamical reaction models 用动态反应模型训练的r-过程核合成粒子诱导裂变截面的神经网络预测
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123104
J.L. Rodríguez-Sánchez , G. García-Jiménez , H. Alvarez-Pol , M. Feijoo-Fontán , A. Graña-González
{"title":"Neural network-based prediction of particle-induced fission cross sections for r-process nucleosynthesis trained with dynamical reaction models","authors":"J.L. Rodríguez-Sánchez ,&nbsp;G. García-Jiménez ,&nbsp;H. Alvarez-Pol ,&nbsp;M. Feijoo-Fontán ,&nbsp;A. Graña-González","doi":"10.1016/j.nuclphysa.2025.123104","DOIUrl":"10.1016/j.nuclphysa.2025.123104","url":null,"abstract":"<div><div>Large-scale computations of fission properties play a crucial role in nuclear reaction network calculations simulating rapid neutron-capture process (r-process) nucleosynthesis. Due to the large number of fissioning nuclei contributing to the r-process, a description of particle-induced fission reactions is computationally challenging. In this work, we use theoretical calculations based on the INCL+ABLA models to train neural networks (NN). The results for the prediction of proton-induced spallation reactions, in particular fission, utilizing a large variety of NN models across the hyper-parameter space are presented, which are relevant for r-process calculations.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123104"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825726","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}
引用次数: 0
Imaging the structure of atomic nuclei in high-energy nuclear collisions from STAR experiment 利用STAR实验对高能核碰撞中的原子核结构进行成像
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123106
Chunjian Zhang , STAR Collaboration
{"title":"Imaging the structure of atomic nuclei in high-energy nuclear collisions from STAR experiment","authors":"Chunjian Zhang ,&nbsp;STAR Collaboration","doi":"10.1016/j.nuclphysa.2025.123106","DOIUrl":"10.1016/j.nuclphysa.2025.123106","url":null,"abstract":"<div><div>In relativistic heavy-ion collisions, the extractions of properties of quark-gluon plasma (QGP) are hindered by a limited understanding of its initial conditions, where the nuclear structure of the colliding ions plays a significant role. In these proceedings, we present the first quantitative demonstration using “collective flow assisted nuclear shape imaging” method to extract the quadrupole deformation and triaxiality from <sup>238</sup>U using data from the Relativistic Heavy Ion Collider (RHIC). We achieve this by comparing bulk observables in collisions of highly deformed <sup>238</sup>U and nearly spherical <sup>197</sup>Au. A similar comparative measurement performed in collisions of <sup>96</sup>Ru+<sup>96</sup>Ru and <sup>96</sup>Zr+<sup>96</sup>Zr, suggests the presence of moderate quadrupole deformation of <sup>96</sup>Ru, large octupole deformation of <sup>96</sup>Zr, as well as an apparent neutron skin difference between these two species. The prospect of this nuclear shape imaging method as a novel tool for the study of nuclear structure is also elaborated.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123106"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825730","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}
引用次数: 0
Reaction theory developments for breakup and quasifree knockout reactions 裂解和准自由敲除反应的反应理论发展
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123098
Kazuyuki Ogata
{"title":"Reaction theory developments for breakup and quasifree knockout reactions","authors":"Kazuyuki Ogata","doi":"10.1016/j.nuclphysa.2025.123098","DOIUrl":"10.1016/j.nuclphysa.2025.123098","url":null,"abstract":"<div><div>Some recent activities on breakup and knockout reaction studies are briefly reviewed. Topics covered are 1) fragile/unbound cluster knockout reactions, 2) effective polarization in (<span><math><mi>p</mi><mo>,</mo><mi>p</mi><mi>α</mi></math></span>) reactions, 3) description of transfer reactions with the impulse approximation, 4) deuteron-induced inclusive reactions, and 5) studies of the thee-nucleon force effect via knockout reactions.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123098"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828935","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}
引用次数: 0
Fission isomer studies with advanced experimental facilities and detection systems 裂变异构体研究与先进的实验设施和检测系统
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123094
Jianwei Zhao , Timo Dickel , Andreas Oberstedt , Peter G. Thirolf
{"title":"Fission isomer studies with advanced experimental facilities and detection systems","authors":"Jianwei Zhao ,&nbsp;Timo Dickel ,&nbsp;Andreas Oberstedt ,&nbsp;Peter G. Thirolf","doi":"10.1016/j.nuclphysa.2025.123094","DOIUrl":"10.1016/j.nuclphysa.2025.123094","url":null,"abstract":"<div><div>The ‘island’ of fission isomers identified in the actinide region (<em>Z</em> = 92 - 97, <em>N</em> = 141- 151) originates from multi-humped fission barriers. Fission isomers are superdeformed and with a low spin representing one of the extremes of the nuclear landscape. However, only scarce experimental information was gained from experiments performed more than 20 years ago. The advances in experimental facilities and detection systems allow us to revive the experimental activities on fission isomer studies. For example, producing fission isomers in <sup>240,242</sup>Am and measuring their delayed fission have been achieved at the IGISOL facility in Jyväskylä. Exploring the production of fission isomers in the U-Np region with <sup>238</sup>U fragmentation is ongoing at GSI, Darmstadt. This paper reviews fission isomers in <sup>235,236</sup>U and <sup>240,242</sup>Am, which are being re-visited.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123094"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828937","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}
引用次数: 0
Multi-observable analysis of jet quenching using Bayesian inference with JETSCAPE 基于JETSCAPE的喷射淬火多观测贝叶斯推理分析
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123100
Lipei Du , JETSCAPE Collaboration
{"title":"Multi-observable analysis of jet quenching using Bayesian inference with JETSCAPE","authors":"Lipei Du ,&nbsp;JETSCAPE Collaboration","doi":"10.1016/j.nuclphysa.2025.123100","DOIUrl":"10.1016/j.nuclphysa.2025.123100","url":null,"abstract":"<div><div>The <span>Jetscape</span> Collaboration presents a new determination of the jet transport parameter <span><math><mover><mrow><mi>q</mi></mrow><mrow><mo>ˆ</mo></mrow></mover></math></span> in the Quark-Gluon Plasma (QGP) using Bayesian Inference. This study expands on previous work by incorporating a comprehensive data set from inclusive hadron and jet yield suppression measurements at RHIC and the LHC. Utilizing Active Learning and other machine-learning approaches for computational efficiency, the analysis efficiently explores the parameter space and studies systematic dependencies across various kinematic and centrality ranges. The results highlight tensions in the extracted <span><math><mover><mrow><mi>q</mi></mrow><mrow><mo>ˆ</mo></mrow></mover></math></span> values across different data sets, providing deeper insights into the physics of jet transport in the QGP.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123100"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834690","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}
引用次数: 0
New measurements of the 19F(p, α0,π)16O reaction cross sections close to the Coulomb barrier 库仑势垒附近19F(p, α0,π)16O反应截面的新测量
IF 1.7 4区 物理与天体物理
Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123102
L. Redigolo , I. Lombardo , D. Dell'Aquila , A. Musumarra , M.G. Pellegriti , M. Russo , G. Verde , M. Vigilante
{"title":"New measurements of the 19F(p, α0,π)16O reaction cross sections close to the Coulomb barrier","authors":"L. Redigolo ,&nbsp;I. Lombardo ,&nbsp;D. Dell'Aquila ,&nbsp;A. Musumarra ,&nbsp;M.G. Pellegriti ,&nbsp;M. Russo ,&nbsp;G. Verde ,&nbsp;M. Vigilante","doi":"10.1016/j.nuclphysa.2025.123102","DOIUrl":"10.1016/j.nuclphysa.2025.123102","url":null,"abstract":"<div><div>We report new cross section data for the <sup>19</sup>F(p, <span><math><msub><mrow><mi>α</mi></mrow><mrow><mn>0</mn><mo>,</mo><mi>π</mi></mrow></msub></math></span>)<sup>16</sup>O reactions at low energies, especially in the 1.1-1.3 MeV region, where few data for the <span><math><msub><mrow><mi>α</mi></mrow><mrow><mi>π</mi></mrow></msub></math></span> channel are reported, and in the 1.6-1.7 MeV energy region, to solve a long-standing discrepancy between existing data sets for the <span><math><msub><mrow><mi>α</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> channel. The new data were included in a comprehensive <em>R</em>-matrix fit, and some suggestions on the cluster nature of <sup>20</sup>Ne states in the 14-15 MeV excitation energy region were discussed.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123102"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825732","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}
引用次数: 0
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