期刊
PHYSICS LETTERS B
卷 829, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.physletb.2022.137059
关键词
Type-1 X-ray bursts; Waiting-point; beta-decay measurement of proton rich isotope
资金
- U.S. Department of Energy [DE-FG02-88ER40387, DE-SC0019042, DE-NA0003909, DE-SC0020451]
- U.S. National Science Foundation [PHY 1848177, PHY-1430152, PHY-1913554]
- U.S. National Nuclear Security Administration [DOE-DE-NA0003906]
- Nuclear Science and Security Consortium [DE-NA0003180]
- Argonne National Laboratory [DE-AC02-06CH11357]
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- IN2P3/CNRS, France, under ENFIA project
- U.S. Department of Energy (DOE) [DE-SC0020451] Funding Source: U.S. Department of Energy (DOE)
In this study, the beta-delayed proton and gamma emission of Zn-57 were measured at the National Superconducting Cyclotron Laboratory. The results include the half-life of Zn-57, the branching ratio of beta p, and the transitions corresponding to the beta-gamma-p decay mode. The study definitively establishes the existence of the Ni-56 bypass.
We measured the Zn-57 beta-delayed proton (beta p) and gamma emission at the National Superconducting Cyclotron Laboratory. We find a Zn-57 half-life of 43.6 +/- 0.2 ms, beta p branching ratio of (84.7 +/- 1.4)%, and identify four transitions corresponding to the exotic beta-gamma-p decay mode, the second such identification in the fp-shell. The p/gamma ratio was used to correct for isospin mixing while determining the Zn-57 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-56 for astrophysical conditions relevant to Type-I X-ray bursts. Our results definitively establish the existence of the Ni-56 bypass, with 14-17% of the rp-process flow taking this route. (C) 2022 The Author(s). Published by Elsevier B.V.
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