Measurement of 75As(n,γ)76As reaction relevant to 0νββ decay searches of 76Ge and astrophysical s-process temperatures
Abstract
The cross sections and resonance structures of ^75As(n,γ)^76As reaction are critical to the neutrinoless double-β (0νββ) decay searches of ^76Ge, the s-process nucleosynthesis of nuclear astrophysics, and Neutron Resonance Capture Analysis for determining the elemental and isotopic composition of archaeological and cultural heritage. We report a high-precision measurement of the ^75As neutron capture cross sections from 1~eV to 1~MeV, performed at the Back-n facility of the China Spallation Neutron Source using the Time-of-Flight method. In the resolved resonance region, nineteen resonance structures of ^75As(n,γ)^76As reaction have been discovered for the first time, and inconsistencies between evaluated libraries has been resolved. Resonance parameters for the newly observed structures were extracted with the R-matrix code SAMMY. These findings will help refine the theoretical predictions of half-lives and decay constants for the double-β decay searches of ^76Ge. Astrophysical Maxwellian-averaged cross sections were calculated based on the averaged cross sections in the unresolved resonance region. And the ^75As(n,γ)^76As reaction rates were derived over the astrophysically relevant temperature range in both the main and weak s-processes nucleosynthesis. The present reaction rates deviate significantly from the recent theoretical predictions, and the uncertainties are significantly reduced.
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BibTeX
@misc{li2026measurement,
title = {{Measurement of $\mathrm^75As(\mathrmn,γ)\mathrm^76As$ reaction relevant to 0$νββ$ decay searches of $\mathrm^76Ge$ and astrophysical $s$-process temperatures}},
author = {Yu-Bing Li and Zhen-Dong An and Wei Jiang and Cheng Li and Yu-Gang Ma and Jie Ren and Xi-Chao Ruan and Rui-Rui Fan and Jing-Yu Tang and Xiang-Zhou Cai and Hong-Wei Wang and Chen-Chen Guo and Di Sun and Ting Liu and Jun-Heng Hu and Hao Liang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.13853},
eprint = {2609.13853},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.13853},
}
RIS
TY - UNPB
TI - Measurement of ^75As(n,γ)^76As reaction relevant to 0νββ decay searches of ^76Ge and astrophysical s-process temperatures
AU - Yu-Bing Li
AU - Zhen-Dong An
AU - Wei Jiang
AU - Cheng Li
AU - Yu-Gang Ma
AU - Jie Ren
AU - Xi-Chao Ruan
AU - Rui-Rui Fan
AU - Jing-Yu Tang
AU - Xiang-Zhou Cai
AU - Hong-Wei Wang
AU - Chen-Chen Guo
AU - Di Sun
AU - Ting Liu
AU - Jun-Heng Hu
AU - Hao Liang
PY - 2026
DA - 2026/09/16
PB - arXiv
DO - 10.48550/arxiv.2609.13853
UR - https://arxiv.org/abs/2609.13853
AB - The cross sections and resonance structures of ^75As(n,γ)^76As reaction are critical to the neutrinoless double-β (0νββ) decay searches of ^76Ge, the s-process nucleosynthesis of nuclear astrophysics, and Neutron Resonance Capture Analysis for determining the elemental and isotopic composition of archaeological and cultural heritage. We report a high-precision measurement of the ^75As neutron capture cross sections from 1~eV to 1~MeV, performed at the Back-n facility of the China Spallation Neutron Source using the Time-of-Flight method. In the resolved resonance region, nineteen resonance structures of ^75As(n,γ)^76As reaction have been discovered for the first time, and inconsistencies between evaluated libraries has been resolved. Resonance parameters for the newly observed structures were extracted with the R-matrix code SAMMY. These findings will help refine the theoretical predictions of half-lives and decay constants for the double-β decay searches of ^76Ge. Astrophysical Maxwellian-averaged cross sections were calculated based on the averaged cross sections in the unresolved resonance region. And the ^75As(n,γ)^76As reaction rates were derived over the astrophysically relevant temperature range in both the main and weak s-processes nucleosynthesis. The present reaction rates deviate significantly from the recent theoretical predictions, and the uncertainties are significantly reduced.
ER -