University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Impact of the first-forbidden beta decay on the production of A = 195 r-process peak

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.

[img]
Preview
Text
1-s2.0-S0370269316001969-main.pdf - Version of Record
Available under License : See the attached licence file.

Download (541kB) | Preview
[img]
Preview
PDF (licence)
SRI_deposit_agreement.pdf
Available under License : See the attached licence file.

Download (33kB) | Preview

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
Subjects : subj_Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Nishimura, NUNSPECIFIEDUNSPECIFIED
Podolyak, ZUNSPECIFIEDUNSPECIFIED
Fang, D-LUNSPECIFIEDUNSPECIFIED
Suzuki, TUNSPECIFIEDUNSPECIFIED
Date : 15 March 2016
Identification Number : 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 : 13 May 2016 17:01
URI: http://epubs.surrey.ac.uk/id/eprint/810710

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800