Structures of exotic Sn-131,Sn-133 isotopes and effect on r-process nucleosynthesis
文献类型：期刊论文
| 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 |
| ISSN号 | 0556-2813 |
| 通讯作者 | Zhang, SS (reprint author), Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China. |
| 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. |
| 学科主题 | Physics |
| 收录类别 | SCI |
| 资助信息 | 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 |
| 原文出处 | http://dx.doi.org/10.1103/PhysRevC.86.032802 |
| 语种 | 英语 |
| WOS记录号 | WOS:000308737500001 |
| 公开日期 | 2014-04-25 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/15029]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 推荐引用方式 GB/T 7714 | 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. |
| APA | Zhang, SS,Smith, MS,Arbanas, G,&Kozub, RL.(2012).Structures of exotic Sn-131,Sn-133 isotopes and effect on r-process nucleosynthesis.PHYSICAL REVIEW C,86(3),32802. |
| MLA | Zhang, SS,et al."Structures of exotic Sn-131,Sn-133 isotopes and effect on r-process nucleosynthesis".PHYSICAL REVIEW C 86.3(2012):32802. |
入库方式： OAI收割
来源：理论物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。