$^{57}$Zn $\beta$-delayed proton emission establishes the $^{56}$Ni $rp$-process waiting point bypass
Nuclear Experiment
2022-04-20 v1 High Energy Astrophysical Phenomena
Solar and Stellar Astrophysics
Abstract
We measured the Zn -delayed proton (p) and emission at the National Superconducting Cyclotron Laboratory. We find a Zn half-life of 43.6 0.2 ms, p branching ratio of (84.7 1.4)%, and identify four transitions corresponding to the exotic -- decay mode, the second such identification in the -shell. The ratio was used to correct for isospin mixing while determining the Zn mass via the isobaric multiplet mass equation. Previously, it was uncertain as to whether the rp-process flow could bypass the textbook waiting point Ni for astrophysical conditions relevant to Type-I X-ray bursts. Our results definitively establish the existence of the Ni bypass, with 14-17% of the -process flow taking this route.
Keywords
Cite
@article{arxiv.2204.01621,
title = {$^{57}$Zn $\beta$-delayed proton emission establishes the $^{56}$Ni $rp$-process waiting point bypass},
author = {M. Saxena and W. -J Ong and Z. Meisel and D. E. M. Hoff and N. Smirnova and P. C. Bender and S. P. Burcher and M. P. Carpenter and J. J. Carroll and A. Chester and C. J. Chiara and R. Conaway and P. A. Copp and B. P. Crider and J. Derkin and A. Estrade and G. Hamad and J. T. Harke and R. Jain and H. Jayatissa and S. N. Liddick and B. Longfellow and M. Mogannam and F. Montes and N. Nepal and T. H. Ogunbeku and A. L. Richard and H. Schatz and D. Soltesz and S. K. Subedi and I. Sultana and A. S. Tamashiro and V. Tripathi and Y. Xiaog and R. Zink},
journal= {arXiv preprint arXiv:2204.01621},
year = {2022}
}