期刊
PHYSICS LETTERS B
卷 756, 期 -, 页码 273-277出版社
ELSEVIER
DOI: 10.1016/j.physletb.2016.03.025
关键词
r-Process; Solar abundances; beta-Decay; First-forbidden transition; Neutron emission; QRPA
资金
- BRIDGCE UK Network
- European Research Council (EU-FP7-ERC-St) [306901]
- STFC (UK)
- MEXT of Japan [15K05090]
- Grants-in-Aid for Scientific Research [15K05090] Funding Source: KAKEN
- European Research Council (ERC) [306901] Funding Source: European Research Council (ERC)
- STFC [ST/J000051/1, ST/L005743/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L005743/1, ST/J000051/1] Funding Source: researchfish
We investigated the effects of first-forbidden transitions in beta decays on the production of the r-process A similar to 195 peak. The theoretical calculated beta-decay rates with beta-delayed neutron emission were examined using several astrophysical conditions. As the FF decay is dominant in N similar to 126 neutron-rich nuclei, their inclusion shortens beta-decay lifetimes and shifts the abundance peak towards higher masses. Additionally, the inclusion of the beta-delayed neutron emission results in a wider abundance peak, and smoothens the mass distribution by removing the odd-even mass staggering. The effects are commonly seen in the results of all adopted astrophysical models. Nevertheless there are quantitative differences, indicating that remaining uncertainty in the determination of half-lives for N = 126 nuclei is still significant in order to determine the production of the r-process peak. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.
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