Fanglei Zou, Xiaojun Sun, Jingshang Zhang, Xiaodong Sun, Xi Tao, Ruirui Xu, Kang Xing, Yongli Jin
{"title":"能级对20 MeV以下\\(n + ^{13}\\) C反应双微分截面的影响","authors":"Fanglei Zou, Xiaojun Sun, Jingshang Zhang, Xiaodong Sun, Xi Tao, Ruirui Xu, Kang Xing, Yongli Jin","doi":"10.1140/epja/s10050-025-01556-y","DOIUrl":null,"url":null,"abstract":"<div><p>The nuclear data of <span>\\(n + ^{13}\\)</span>C reaction are very important in describing the evolution of nuclear astrophysics, understanding the cluster structure of light nuclei, and producting the radiocarbon. Based on the unified Hauser-Feshbach and exciton model, a statistical theory of light nucleus reaction (STLN) is improved to describe the effects of energy levels on the double-differential cross sections of neutron and charged particles for <span>\\(n + ^{13}\\)</span>C reaction. The individual contributions of every energy level of the target and different residual nuclei have been analysed. The calculated results agree well with all of the existing experimental double-differential cross sections of outgoing neutron. And the theoretical analysis provides an evidence for the existence of the possible levels of <span>\\(^{13}\\)</span>C. The results also indicate that the contributions of the direct inelastic scattering derived from DWBA theory and the three-body breakup reaction should be considered. Especially, the contributions of (<i>n</i>, 2<i>n</i>) channel of the 6-th energy level of <span>\\(^{13}\\)</span>C have been considered. The doubt regarding the significant discrepancies observed near 3-MeV exit energy range for two closely spaced incident energies of 8.09 MeV and 8.24 MeV has been clarified. Furthermore, the total double-differential cross sections of outgoing proton, deuteron, triton, and <span>\\(\\alpha \\)</span> can be self-consistently predicted at arbitrary outgoing angles and incident energies for <span>\\(n+^{13}\\text {C}\\)</span> reaction.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of energy levels on the double-differential cross sections for \\\\(n + ^{13}\\\\)C reaction below 20 MeV\",\"authors\":\"Fanglei Zou, Xiaojun Sun, Jingshang Zhang, Xiaodong Sun, Xi Tao, Ruirui Xu, Kang Xing, Yongli Jin\",\"doi\":\"10.1140/epja/s10050-025-01556-y\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The nuclear data of <span>\\\\(n + ^{13}\\\\)</span>C reaction are very important in describing the evolution of nuclear astrophysics, understanding the cluster structure of light nuclei, and producting the radiocarbon. Based on the unified Hauser-Feshbach and exciton model, a statistical theory of light nucleus reaction (STLN) is improved to describe the effects of energy levels on the double-differential cross sections of neutron and charged particles for <span>\\\\(n + ^{13}\\\\)</span>C reaction. The individual contributions of every energy level of the target and different residual nuclei have been analysed. The calculated results agree well with all of the existing experimental double-differential cross sections of outgoing neutron. And the theoretical analysis provides an evidence for the existence of the possible levels of <span>\\\\(^{13}\\\\)</span>C. The results also indicate that the contributions of the direct inelastic scattering derived from DWBA theory and the three-body breakup reaction should be considered. Especially, the contributions of (<i>n</i>, 2<i>n</i>) channel of the 6-th energy level of <span>\\\\(^{13}\\\\)</span>C have been considered. The doubt regarding the significant discrepancies observed near 3-MeV exit energy range for two closely spaced incident energies of 8.09 MeV and 8.24 MeV has been clarified. Furthermore, the total double-differential cross sections of outgoing proton, deuteron, triton, and <span>\\\\(\\\\alpha \\\\)</span> can be self-consistently predicted at arbitrary outgoing angles and incident energies for <span>\\\\(n+^{13}\\\\text {C}\\\\)</span> reaction.</p></div>\",\"PeriodicalId\":786,\"journal\":{\"name\":\"The European Physical Journal A\",\"volume\":\"61 4\",\"pages\":\"\"},\"PeriodicalIF\":2.6000,\"publicationDate\":\"2025-04-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The European Physical Journal A\",\"FirstCategoryId\":\"4\",\"ListUrlMain\":\"https://link.springer.com/article/10.1140/epja/s10050-025-01556-y\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"PHYSICS, NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The European Physical Journal A","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1140/epja/s10050-025-01556-y","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, NUCLEAR","Score":null,"Total":0}
Effects of energy levels on the double-differential cross sections for \(n + ^{13}\)C reaction below 20 MeV
The nuclear data of \(n + ^{13}\)C reaction are very important in describing the evolution of nuclear astrophysics, understanding the cluster structure of light nuclei, and producting the radiocarbon. Based on the unified Hauser-Feshbach and exciton model, a statistical theory of light nucleus reaction (STLN) is improved to describe the effects of energy levels on the double-differential cross sections of neutron and charged particles for \(n + ^{13}\)C reaction. The individual contributions of every energy level of the target and different residual nuclei have been analysed. The calculated results agree well with all of the existing experimental double-differential cross sections of outgoing neutron. And the theoretical analysis provides an evidence for the existence of the possible levels of \(^{13}\)C. The results also indicate that the contributions of the direct inelastic scattering derived from DWBA theory and the three-body breakup reaction should be considered. Especially, the contributions of (n, 2n) channel of the 6-th energy level of \(^{13}\)C have been considered. The doubt regarding the significant discrepancies observed near 3-MeV exit energy range for two closely spaced incident energies of 8.09 MeV and 8.24 MeV has been clarified. Furthermore, the total double-differential cross sections of outgoing proton, deuteron, triton, and \(\alpha \) can be self-consistently predicted at arbitrary outgoing angles and incident energies for \(n+^{13}\text {C}\) reaction.
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