Nuclear Physics APub Date : 2025-04-25DOI: 10.1016/j.nuclphysa.2025.123117
K.A. Chipps, JENSA, SECAR collaborations
{"title":"JENSA: Past, present, and future","authors":"K.A. Chipps, JENSA, SECAR collaborations","doi":"10.1016/j.nuclphysa.2025.123117","DOIUrl":"10.1016/j.nuclphysa.2025.123117","url":null,"abstract":"<div><div>Nuclear reaction studies rely on three main physical components: the beam of nuclei provided by the facility, the detector systems used to measure the outgoing particles of interest, and the target. Target fabrication is thus a critical aspect of studying the reactions that power stars and probe the evolution of nuclear structure. The Jet Experiments in Nuclear Structure and Astrophysics (JENSA) gas jet target is the most dense helium jet target for rare isotope beam reaction studies in the world, providing targets of gaseous elements such as helium, nitrogen, and neon. A brief overview of the design and operation of JENSA, including commissioning and recent science experiments, and a discussion the future of JENSA coupled to the dedicated recoil separator SECAR, are presented.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123117"},"PeriodicalIF":1.7,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882372","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}
Nuclear Physics APub Date : 2025-04-23DOI: 10.1016/j.nuclphysa.2025.123121
K. Tsukada
{"title":"Recent results and prospects of the SCRIT electron scattering facility","authors":"K. Tsukada","doi":"10.1016/j.nuclphysa.2025.123121","DOIUrl":"10.1016/j.nuclphysa.2025.123121","url":null,"abstract":"<div><div>This report presents the successful demonstration of the world's first electron scattering experiment using an online-produced unstable nuclear target. A stationary target of <sup>137</sup>Cs, generated via photofission of uranium, was formed in an electron storage ring using a new target-forming technique. Elastically scattered electrons were detected and the observed angular distributions are in good agreement with theoretical calculations.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123121"},"PeriodicalIF":1.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868816","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}
Nuclear Physics APub Date : 2025-04-23DOI: 10.1016/j.nuclphysa.2025.123115
I. Lombardo , L. Redigolo , D. Dell'Aquila , M. Vigilante , M. Aytekin , L. Baldesi , S. Barlini , A. Camaiani , G. Casini , C. Ciampi , M. Cicerchia , D. Fabris , C. Frosin , F. Gramegna , T. Marchi , A. Ordine , P. Ottanelli , G. Pasquali , S. Piantelli , M. Russo , G. Verde
{"title":"Alpha structures of 16O at high excitation energies by 3He + 13C nuclear reactions","authors":"I. Lombardo , L. Redigolo , D. Dell'Aquila , M. Vigilante , M. Aytekin , L. Baldesi , S. Barlini , A. Camaiani , G. Casini , C. Ciampi , M. Cicerchia , D. Fabris , C. Frosin , F. Gramegna , T. Marchi , A. Ordine , P. Ottanelli , G. Pasquali , S. Piantelli , M. Russo , G. Verde","doi":"10.1016/j.nuclphysa.2025.123115","DOIUrl":"10.1016/j.nuclphysa.2025.123115","url":null,"abstract":"<div><div>We investigated the occurrence of <em>α</em> clustered states in <sup>16</sup>O at high excitation energies by analyzing <sup>3</sup>He + <sup>13</sup>C reactions in the 1.4 - 2.2 MeV energy range. The branching ratios between the <em>α</em> decays leading to <sup>12</sup>C in the Hoyle <em>versus</em> the ground states are larger than calculation based on barrier penetration models, suggesting the existence of states with large cluster components in the parent nucleus.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123115"},"PeriodicalIF":1.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868926","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":"ONOKORO project: Comprehensive research of cluster formation in medium-heavy and heavy nuclei","authors":"Yuki Kubota , Kodjo Agbekponou , DeukSoon Ahn , Hidetada Baba , Koshi Higuchi , Yuto Hijikata , Sunji Kim , Yosuke Kondo , Shumpei Koyama , Kazuki Kyo , Kenjiro Miki , Tomoya Nakada , Shingo Ogio , Thomas Pohl , Taiki Sugiyama , Shoko Takeshige , Junki Tanaka , Ryotaro Tsuji , Ren Urayama , Kanta Yahiro , Tomohiro Uesaka","doi":"10.1016/j.nuclphysa.2025.123123","DOIUrl":"10.1016/j.nuclphysa.2025.123123","url":null,"abstract":"<div><div>Nuclear clustering is a topic with a rich historical background that is receiving renewed attention. It has been established for light nuclei and in <em>α</em> decay nuclei. However, very little is known about clustering in medium-heavy and heavy nuclei. The ONOKORO project, initiated in 2021 with KAKENHI funding from JSPS, aims to conduct a systematic study of nuclear clustering over a wide mass range by combining the capabilities of three facilities: RCNP, RIBF, and HIMAC, utilizing the cluster knockout reaction at intermediate energy. The construction of the TOGAXSI telescope for inverse kinematics measurements is underway. The TOGAXSI telescope, combining Si trackers and GAGG(Ce) calorimeters, has completed its basic development with beams at HIMAC and is currently under construction at RIBF. The first comprehensive cluster knockout measurements for the stable nuclei <sup>40,42,44,48</sup>Ca together with <sup>6,7</sup>Li have been conducted at RCNP. The separation energy spectra for deuteron, triton, <sup>3</sup>He, and <em>α</em> clusters have been successfully obtained. The complemental measurements for the unstable nuclei <span><math><msup><mrow></mrow><mrow><mn>50</mn><mtext>–</mtext><mn>52</mn></mrow></msup></math></span>Ca are planned in 2025 at RIBF.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123123"},"PeriodicalIF":1.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868818","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}
Nuclear Physics APub Date : 2025-04-23DOI: 10.1016/j.nuclphysa.2025.123125
J. Pellumaj , A. Gottardo , A. Goasduff , D. Bazzacco , D. Brugnara , G. Benzoni , S. Bottoni , S. Capra , G. de Angelis , A. Gozzelino , J. Ha , S.M. Lenzi , T. Marchi , R. Menegazzo , D. Mengoni , A. Nannini , D.R. Napoli , R.M. Pérez-Vidal , S. Pigliapoco , F. Recchia , M. Loriggiola
{"title":"Investigating the collectivity of intruder states along N=49 isotones","authors":"J. Pellumaj , A. Gottardo , A. Goasduff , D. Bazzacco , D. Brugnara , G. Benzoni , S. Bottoni , S. Capra , G. de Angelis , A. Gozzelino , J. Ha , S.M. Lenzi , T. Marchi , R. Menegazzo , D. Mengoni , A. Nannini , D.R. Napoli , R.M. Pérez-Vidal , S. Pigliapoco , F. Recchia , M. Loriggiola","doi":"10.1016/j.nuclphysa.2025.123125","DOIUrl":"10.1016/j.nuclphysa.2025.123125","url":null,"abstract":"<div><div>Intruder states that originate from the promotion of neutrons across the N=50 shell gap are observed along the N=49 isotones (<sup>79</sup>Zn, <sup>81</sup>Ge, <sup>83</sup>Se, <sup>85</sup>Kr), with the lowest energy in <sup>83</sup>Se. The reduction of the N=50 shell gap towards Ni favors the lowering in the energy of these states. Moreover, since the Se nucleus (Z=34) is in the middle of the proton fp-shell (28≤Z≤40), it should have the maximum quadrupole correlations, lowering further the energy of these deformed configurations. This makes Se a good candidate for understanding the collectivity of the particle-hole intruder states in this region. Such information could also be used as a testing ground for theoretical models aiming to describe the region in the vicinity of <sup>78</sup>Ni. An experiment aiming to measure the lifetime of the 540-keV 1/2<sup>+</sup> and 1100-keV 3/2<sup>+</sup> intruder states of <sup>83</sup>Se was performed at LNL and is reported in this work.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123125"},"PeriodicalIF":1.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868814","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}
Nuclear Physics APub Date : 2025-04-23DOI: 10.1016/j.nuclphysa.2025.123120
S. Ota , P. Capel , G. Christian , V. Durant , K. Hagel , E. Harris , R.C. Johnson , Z. Luo , F.M. Nunes , M. Roosa , A. Saastamoinen , D.P. Scriven
{"title":"First experimental test of the ratio method","authors":"S. Ota , P. Capel , G. Christian , V. Durant , K. Hagel , E. Harris , R.C. Johnson , Z. Luo , F.M. Nunes , M. Roosa , A. Saastamoinen , D.P. Scriven","doi":"10.1016/j.nuclphysa.2025.123120","DOIUrl":"10.1016/j.nuclphysa.2025.123120","url":null,"abstract":"<div><div>The ratio is a new reaction observable suggested to extract accurately structure information on halo nuclei. It corresponds to the ratio of differential cross sections for scattering and breakup, which is predicted to remove the uncertainty related to the reaction dynamics. We present here the first experimental test of the method for the <sup>11</sup>Be + <sup>12</sup>C collision at <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>Lab</mi></mrow></msub><mo>=</mo><mn>20</mn><mi>A</mi></math></span> MeV performed at Texas A&M University. Differential cross sections for scattering and inclusive one-neutron breakup have been measured with the new detector array BlueSTEAl. The ratio of cross sections is very smooth and independent of the projectile-target interaction, which demonstrates the validity of the <em>ratio method</em>. We extend our analysis to existing <sup>11</sup>Be + <sup>208</sup>Pb data, confirming that the method works well on any target.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123120"},"PeriodicalIF":1.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887084","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}
Nuclear Physics APub Date : 2025-04-23DOI: 10.1016/j.nuclphysa.2025.123114
Nadia Tsoneva
{"title":"Dipole excitations in nuclei","authors":"Nadia Tsoneva","doi":"10.1016/j.nuclphysa.2025.123114","DOIUrl":"10.1016/j.nuclphysa.2025.123114","url":null,"abstract":"<div><div>Dipole strengths of nuclear excitations to GDR energies in neutron excess nuclei are investigated in a theoretical approach based on EDF and QPM theory. Recent developments of the method, including a reaction theory, have been applied in spectroscopic studies of two-phonon states, pygmy and giant resonances, thus demonstrating its effectiveness. Besides the single-particle nature of the excited nuclear states from the PDR region, different properties of the low-energy dipole strength emerge from the analysis of inelastic photon-, proton- and alpha-scattering spectral distributions and branching ratios, from which the fine structure of the low-energy dipole strength and the role of quasicontinuum coupling can be probed. Experimentally, the determination of the dipole strength distribution and the associated photoabsorption cross section requires knowledge of the intensity distribution of the ground state transitions and their branching ratios. These quantities cannot be derived directly from the measured spectra. However, they can be determined theoretically from our microscopic calculations, which contribute to the understanding of the experimental data.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123114"},"PeriodicalIF":1.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868815","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}
Nuclear Physics APub Date : 2025-04-23DOI: 10.1016/j.nuclphysa.2025.123124
J.P. McDonaugh, A. Simon, C. Jones, J. Koros, M. Matney, L. Zimmer, T.L. Bailey, C. Boomershine, S. Carmichael, R. Fang, D. Robertson, E. Stech
{"title":"First results from measurements of capture reactions on Sn and Pd for the γ-process using HECTOR","authors":"J.P. McDonaugh, A. Simon, C. Jones, J. Koros, M. Matney, L. Zimmer, T.L. Bailey, C. Boomershine, S. Carmichael, R. Fang, D. Robertson, E. Stech","doi":"10.1016/j.nuclphysa.2025.123124","DOIUrl":"10.1016/j.nuclphysa.2025.123124","url":null,"abstract":"<div><div>The formation of p-nuclei and their abundances are an important and ongoing study in nuclear astrophysical measurements. To understand and constrain theoretical models on the abundances of p-nuclei, further measurements of reactions on relevant nuclei and important branching points of the <em>γ</em>-process are needed. For this purpose the cross sections of (p,<em>γ</em>) reactions on <sup>112,114,116</sup>Sn and <sup>108</sup>Pd(p,<em>γ</em>)<sup>109</sup>Ag over a combined energy range of <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span>=2.5-4 MeV and <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span>=2.1-3.5 MeV for Sn and Pd respectively, were investigated. These measurements were performed using the 5U accelerator at the Nuclear Science Laboratory at the University of Notre Dame. Preliminary yield results from the experiments will be discussed.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123124"},"PeriodicalIF":1.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868819","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}
Nuclear Physics APub Date : 2025-04-23DOI: 10.1016/j.nuclphysa.2025.123122
Toshimi Suda
{"title":"Low-energy electron scattering for nucleons and exotic nuclei - ULQ2 and SCRIT -","authors":"Toshimi Suda","doi":"10.1016/j.nuclphysa.2025.123122","DOIUrl":"10.1016/j.nuclphysa.2025.123122","url":null,"abstract":"<div><div>In this report, I will present two unique low-energy electron-scattering activities currently underway in Japan. These include: 1) the world's first electron scattering experiments on online-produced exotic nuclei, and 2) the lowest-ever beam-energy electron scattering from the proton and deuteron.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123122"},"PeriodicalIF":1.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868925","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}
Nuclear Physics APub Date : 2025-04-16DOI: 10.1016/j.nuclphysa.2025.123095
S. Quaglioni , K. Kravvaris , P. Navrátil , C. Hebborn , G. Hupin
{"title":"Ab initio calculations of scattering and fusion reactions","authors":"S. Quaglioni , K. Kravvaris , P. Navrátil , C. Hebborn , G. Hupin","doi":"10.1016/j.nuclphysa.2025.123095","DOIUrl":"10.1016/j.nuclphysa.2025.123095","url":null,"abstract":"<div><div>We review recent advancements achieved within the ab initio no-core shell model with continuum (NCSMC), a unified first-principle (or, ab initio) approach to nuclear bound and continuum states. We highlight its application to reactions of astrophysical interests, including the <sup>7</sup>Be<span><math><msup><mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi>γ</mi><mo>)</mo></mrow><mrow><mn>8</mn></mrow></msup></math></span>B solar fusion and <em>α</em>-<em>α</em> scattering, and to the structure of the exotic <sup>12</sup>Be nucleus. Our findings provide a solid foundation for integrating ab initio calculations with experimental measurements, allowing for more precise evaluations of key thermonuclear reaction rates at astrophysical energies, and offer new insights into the factors that contribute to the emergence of clustering.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123095"},"PeriodicalIF":1.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868817","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}