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题名: Structures of exotic Sn-131,Sn-133 isotopes and effect on r-process nucleosynthesis
作者: Zhang, SS ;  Smith, MS ;  Arbanas, G ;  Kozub, RL
刊名: PHYSICAL REVIEW C
出版日期: 2012
卷号: 86, 期号:3, 页码:32802
关键词: PLUS BCS APPROACH ;  PAIRING CORRELATIONS ;  RESONANT CONTINUUM ;  SINGLE-PARTICLE ;  REACTION-RATES ;  LEVEL DENSITY ;  MODELS ;  HALO
学科分类: Physics
通讯作者: Zhang, SS (reprint author), Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China.
部门归属: [Zhang, Shi-Sheng] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China; [Zhang, Shi-Sheng] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China; [Zhang, Shi-Sheng] Oak Ridge Natl Lab, Joint Inst Heavy Ion Res, Oak Ridge, TN 37831 USA; [Smith, M. S.] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA; [Arbanas, G.] Oak Ridge Natl Lab, Reactor & Nucl Syst Div, Oak Ridge, TN 37831 USA; [Kozub, R. L.] Tennessee Technol Univ, Dept Phys, Cookeville, TN 38505 USA
英文摘要: Background: Four strong single-particle bound levels with strikingly similar level spacings have recently been measured in Sn-131 and Sn-133. This similarity has not yet been addressed by a theoretical nuclear structure model. Information on these single-particle bound levels, as well as on resonant levels above the neutron capture threshold, is also needed to determine neutron capture cross sections-and corresponding capture reaction rates-on Sn-130,Sn-132. The Sn-130(n,gamma) rate was shown in a recent sensitivity study to significantly impact the synthesis of heavy elements in the r-process in supernovae. Purpose: Understand the structure of bound and resonant levels in Sn-131,Sn-133, and determine if the densities of unbound resonant levels are sufficiently high to warrant statistical model treatments of neutron capture on Sn-130,Sn-132. Method: Single-particle bound and resonant levels for Sn-131,Sn-133 are self-consistently calculated by the analytical continuation of the coupling constant (ACCC) method based on a relativistic mean field (RMF) theory with BCS approximation. Results: We obtain four strong single-particle bound levels in both Sn-131,Sn-133 with an ordering that agrees with experiments and spacings that, while differing from experiment, are consistent between the Sn isotopes. We also find at most one single-particle level in the effective energy range for neutron captures in the r-process. Conclusions: Our RMF + ACCC + BCS model successfully reproduces observed single-particle bound levels in (131,13)3Sn and self-consistently predicts single-particle resonant levels with densities too low for widely used traditional statistical model treatments of neutron capture cross sections on Sn-130,Sn-132 employing Fermi gas level density formulations.
资助者: Fundamental Research Funds for Central Universities; Beihang New Star; National Natural Science Foundation of China [10605004, 11035007]; International Science and Technology Cooperation Projects [2012DFG61930]; Topical Collaboration on Theory of Reactions for Unstable iSotopes (TORUS); US Dept. of Energy, Office of Nuclear Physics
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000308737500001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15029
Appears in Collections:理论物理所2012年知识产出_期刊论文

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Recommended Citation:
Zhang, SS,Smith, MS,Arbanas, G,et al. Structures of exotic Sn-131,Sn-133 isotopes and effect on r-process nucleosynthesis[J]. PHYSICAL REVIEW C,2012,86(3):32802.
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