Pub Date : 2025-04-23DOI: 10.1016/j.nuclphysa.2025.123121
K. Tsukada
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 137Cs, 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.
{"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}
Pub 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
We investigated the occurrence of α clustered states in 16O at high excitation energies by analyzing 3He + 13C reactions in the 1.4 - 2.2 MeV energy range. The branching ratios between the α decays leading to 12C in the Hoyle versus 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.
{"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}
Nuclear clustering is a topic with a rich historical background that is receiving renewed attention. It has been established for light nuclei and in α 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 40,42,44,48Ca together with 6,7Li have been conducted at RCNP. The separation energy spectra for deuteron, triton, 3He, and α clusters have been successfully obtained. The complemental measurements for the unstable nuclei Ca are planned in 2025 at RIBF.
{"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}
Pub 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
Intruder states that originate from the promotion of neutrons across the N=50 shell gap are observed along the N=49 isotones (79Zn, 81Ge, 83Se, 85Kr), with the lowest energy in 83Se. 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 78Ni. An experiment aiming to measure the lifetime of the 540-keV 1/2+ and 1100-keV 3/2+ intruder states of 83Se was performed at LNL and is reported in this work.
{"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}
Pub Date : 2025-04-23DOI: 10.1016/j.nuclphysa.2025.123114
Nadia Tsoneva
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.
{"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}
Pub 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
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 γ-process are needed. For this purpose the cross sections of (p,γ) reactions on 112,114,116Sn and 108Pd(p,γ)109Ag over a combined energy range of =2.5-4 MeV and =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.
{"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}
Pub Date : 2025-04-23DOI: 10.1016/j.nuclphysa.2025.123122
Toshimi Suda
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.
{"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}
146Sm is an important nuclide for both geochronological and astrophysical applications, its precise half-life value is essential for accurate geological applications. Nevertheless, significant discrepancies exist in the measured half-life values of 146Sm. A new experimental method has been proposed by merely measuring the total amount of 146Eu and the decay of 146Sm, corresponding α and γ spectrometers have been developed for the measurement. The preliminary experiment has been carried out in HI-13 tandem accelerator of China Institute of Atomic Energy. Based on α and γ measurements, the half-life of 147Eu has been double checked and the results agree well with existing values, which gives a verification for the reliability of our half-life measurement systems. The half-life of 146Eu has been updated to days, which is 9% lower than the value reported in the database. Based on our analysis, this difference has a significant impact on the determination of the number of 146Eu atoms, and consequently has an equivalent impact on the measurement of 146Sm half-life.
{"title":"Half-life measurement of short-lived nuclide 146Eu","authors":"Changxin Guo, Yunju Li, Shengquan Yan, Minghao Zhu, Youbao Wang, Yuqiang Zhang, Jinlong Ma, Wei Nan, Tao Tian, Jianglin Hou, Jiayinhao Li","doi":"10.1016/j.nuclphysa.2025.123113","DOIUrl":"10.1016/j.nuclphysa.2025.123113","url":null,"abstract":"<div><div><sup>146</sup>Sm is an important nuclide for both geochronological and astrophysical applications, its precise half-life value is essential for accurate geological applications. Nevertheless, significant discrepancies exist in the measured half-life values of <sup>146</sup>Sm. A new experimental method has been proposed by merely measuring the total amount of <sup>146</sup>Eu and the decay of <sup>146</sup>Sm, corresponding <em>α</em> and <em>γ</em> spectrometers have been developed for the measurement. The preliminary experiment has been carried out in HI-13 tandem accelerator of China Institute of Atomic Energy. Based on <em>α</em> and <em>γ</em> measurements, the half-life of <sup>147</sup>Eu has been double checked and the results agree well with existing values, which gives a verification for the reliability of our half-life measurement systems. The half-life of <sup>146</sup>Eu has been updated to <span><math><mn>4.21</mn><mo>±</mo><mn>0.05</mn></math></span> days, which is 9% lower than the value reported in the database. Based on our analysis, this difference has a significant impact on the determination of the number of <sup>146</sup>Eu atoms, and consequently has an equivalent impact on the measurement of <sup>146</sup>Sm half-life.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123113"},"PeriodicalIF":1.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860488","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}
Pub Date : 2025-04-16DOI: 10.1016/j.nuclphysa.2025.123095
S. Quaglioni , K. Kravvaris , P. Navrátil , C. Hebborn , G. Hupin
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 7BeB solar fusion and α-α scattering, and to the structure of the exotic 12Be 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.
{"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}
Pub Date : 2025-04-16DOI: 10.1016/j.nuclphysa.2025.123110
J. Koros , A. Simon , J.T. Harke , R.O. Hughes , P. Adsley , B.H. Isselhardt , B. Longfellow , M. Matney , C.S. Reingold
Indirect measurement techniques, such as the surrogate method, are necessary to constrain cross sections and reaction rates that are inaccessible for direct measurement. The surrogate method uses an alternate reaction channel to populate a nucleus of interest, and combines resulting experimental data with theory to constrain the desired (n,γ) cross section. Individual γ-decay probabilities are experimentally extracted using γ-ray spectroscopy. This project utilizes surrogate analysis of 64,70Zn(p,d) and 64,70Zn(p,t) reactions measured with the Hyperion array at Texas A&M University's Cyclotron Facility to probe the relevant neutron capture reactions 61,62,67,68Zn(n,γ). As an example, preliminary γ-decay probabilities are presented for 69Zn.
{"title":"Constraining (n,γ) cross sections via surrogate measurements with hyperion","authors":"J. Koros , A. Simon , J.T. Harke , R.O. Hughes , P. Adsley , B.H. Isselhardt , B. Longfellow , M. Matney , C.S. Reingold","doi":"10.1016/j.nuclphysa.2025.123110","DOIUrl":"10.1016/j.nuclphysa.2025.123110","url":null,"abstract":"<div><div>Indirect measurement techniques, such as the surrogate method, are necessary to constrain cross sections and reaction rates that are inaccessible for direct measurement. The surrogate method uses an alternate reaction channel to populate a nucleus of interest, and combines resulting experimental data with theory to constrain the desired (n,<em>γ</em>) cross section. Individual <em>γ</em>-decay probabilities are experimentally extracted using <em>γ</em>-ray spectroscopy. This project utilizes surrogate analysis of <sup>64,70</sup>Zn(p,d) and <sup>64,70</sup>Zn(p,t) reactions measured with the Hyperion array at Texas A&M University's Cyclotron Facility to probe the relevant neutron capture reactions <sup>61,62,67,68</sup>Zn(n,<em>γ</em>). As an example, preliminary <em>γ</em>-decay probabilities are presented for <sup>69</sup>Zn.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123110"},"PeriodicalIF":1.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868924","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}
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