Impact of the first-forbidden beta decay on the production of A = 195 r-process peak
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Nishimura, N, Podolyak, Z, Fang, D-L and Suzuki, T (2016) Impact of the first-forbidden beta decay on the production of A = 195 r-process peak Physics Letters B, 756. pp. 273-277.
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Abstract
We investigated the effects of first-forbidden transitions in β decays on the production of the r -process A∼195 peak. The theoretical calculated β-decay rates with β-delayed neutron emission were examined using several astrophysical conditions. As the FF decay is dominant in N∼126 neutron-rich nuclei, their inclusion shortens β-decay lifetimes and shifts the abundance peak towards higher masses. Additionally, the inclusion of the β -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.
| Item Type: | Article | |||||||||||||||
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| Subjects : | subj_Physics | |||||||||||||||
| Divisions : | Faculty of Engineering and Physical Sciences > Physics | |||||||||||||||
| Authors : |
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| Date : | 15 March 2016 | |||||||||||||||
| DOI : | 10.1016/j.physletb.2016.03.025 | |||||||||||||||
| Copyright Disclaimer : | © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3. | |||||||||||||||
| Uncontrolled Keywords : | r-Process; Solar abundances; β-Decay; First-forbidden transition; Neutron emission; QRPA | |||||||||||||||
| Depositing User : | Symplectic Elements | |||||||||||||||
| Date Deposited : | 13 May 2016 17:01 | |||||||||||||||
| Last Modified : | 31 Oct 2017 18:18 | |||||||||||||||
| URI: | http://epubs.surrey.ac.uk/id/eprint/810710 |
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