Proton emission half-lives and shape coexistence for 71 ≤ Z ≤ 83 odd-Z nuclei
Abstract
One-proton emission is a direct probe of nuclear structure near the proton drip line and plays a critical role in understanding exotic decay modes and nucleosynthesis processes. In this study, we investigate the half-lives of one-proton emitters for 71 ≤ Z ≤ 83 odd-Z nuclei by employing the WKB approximation with nuclear potentials obtained from the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) and, for comparison, the relativistic continuum Hartree-Bogoliubov theory (RCHB). We first compare the calculated half-lives with available experimental data. The inclusion of quadrupole deformation via the DRHBc hardly contributes to improving the predictions of half-lives for the deformed nuclei. We find that all the studied nuclei exhibit ground states with |β2,DRHBc| < 0.15, and within this limited deformation range the spectroscopic factor provides the dominant contribution to the half-life, compared to the decay width. In particular, for nuclei exhibiting shape coexistence in DRHBc, such as 170Au, where the half-life varies significantly with the quadrupole deformation through its effect on the spectroscopic factor, we expect shape coexistence to exert a substantial influence on the variation of half-lives. Finally, we discuss the half-lives in consideration of shape coexistence. Our results indicate that the calculated half-life is governed not by the total-energy difference between coexisting minima but rather by the spectroscopic factor influenced by the deformation.
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BibTeX
@misc{choi2026proton,
title = {{Proton emission half-lives and shape coexistence for $71 \leq Z \leq 83$ odd-$Z$ nuclei}},
author = {Yongbeom Choi and Chang-Hwan Lee and Youngman Kim},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2608.19601},
eprint = {2608.19601},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.19601},
}
RIS
TY - UNPB
TI - Proton emission half-lives and shape coexistence for 71 ≤ Z ≤ 83 odd-Z nuclei
AU - Yongbeom Choi
AU - Chang-Hwan Lee
AU - Youngman Kim
PY - 2026
DA - 2026/09/04
PB - arXiv
DO - 10.48550/arxiv.2608.19601
UR - https://arxiv.org/abs/2608.19601
AB - One-proton emission is a direct probe of nuclear structure near the proton drip line and plays a critical role in understanding exotic decay modes and nucleosynthesis processes. In this study, we investigate the half-lives of one-proton emitters for 71 ≤ Z ≤ 83 odd-Z nuclei by employing the WKB approximation with nuclear potentials obtained from the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) and, for comparison, the relativistic continuum Hartree-Bogoliubov theory (RCHB). We first compare the calculated half-lives with available experimental data. The inclusion of quadrupole deformation via the DRHBc hardly contributes to improving the predictions of half-lives for the deformed nuclei. We find that all the studied nuclei exhibit ground states with |β_2,DRHBc| < 0.15, and within this limited deformation range the spectroscopic factor provides the dominant contribution to the half-life, compared to the decay width. In particular, for nuclei exhibiting shape coexistence in DRHBc, such as ^170Au, where the half-life varies significantly with the quadrupole deformation through its effect on the spectroscopic factor, we expect shape coexistence to exert a substantial influence on the variation of half-lives. Finally, we discuss the half-lives in consideration of shape coexistence. Our results indicate that the calculated half-life is governed not by the total-energy difference between coexisting minima but rather by the spectroscopic factor influenced by the deformation.
ER -