학술논문
57Zn β-delayed proton emission establishes the 56Ni rp-process waiting point bypass
Document Type
article
Author
M. Saxena; W. -J Ong; Z. Meisel; D.E.M. Hoff; N. Smirnova; P.C. Bender; S.P. Burcher; M.P. Carpenter; J.J. Carroll; A. Chester; C.J. Chiara; R. Conaway; P.A. Copp; B.P. Crider; J. Derkin; A. Estradé; G. Hamad; J.T. Harke; R. Jain; H. Jayatissa; S.N. Liddick; B. Longfellow; M. Mogannam; F. Montes; N. Nepal; T.H. Ogunbeku; A.L. Richard; H. Schatz; D. Soltesz; S.K. Subedi; I. Sultana; A.S. Tamashiro; V. Tripathi; Y. Xiao; R. Zink
Source
Physics Letters B, Vol 829, Iss , Pp 137059- (2022)
Subject
Language
English
ISSN
0370-2693
Abstract
We measured the Zn57 β-delayed proton (βp) and γ emission at the National Superconducting Cyclotron Laboratory. We find a Zn57 half-life of 43.6±0.2 ms, βp branching ratio of (84.7±1.4)%, and identify four transitions corresponding to the exotic β-γ-p decay mode, the second such identification in the fp-shell. The p/γ ratio was used to correct for isospin mixing while determining the Zn57 mass via the isobaric multiplet mass equation. Previously, it was uncertain as to whether the rp-process flow could bypass the textbook waiting point Ni56 for astrophysical conditions relevant to Type-I X-ray bursts. Our results definitively establish the existence of the Ni56 bypass, with 14-17% of the rp-process flow taking this route.