罕见的$^{40}$K衰变及其对基础物理与地质年代学的意义
核实验
2023-08-10 v4 高能物理 - 实验
摘要
钾-40是一种广泛存在的天然同位素，其放射性影响着亚原子稀有事件搜寻、核结构理论以及估算的地质年龄。一种预言的直接衰变到氩-40基态的电子俘获衰变从未被观测到。KDK（钾衰变）合作组报告了这种罕见衰变模式的强有力证据。一项盲分析揭示基态电子俘获强度（）与激发态电子俘获强度（）的非零比值为 （68%置信水平），原假设在4下被拒绝。就分支比而言，该信号给出 ，约为常用预言值的一半，对多个领域产生影响[L. Hariasz等人， companion paper，DOI: 10.1103/PhysRevC.108.014327]。
引用
@article{arxiv.2211.10319,
title = {Rare $^{40}$K decay with implications for fundamental physics and geochronology},
author = {M. Stukel and L. Hariasz and P. C. F. Di Stefano and B. C. Rasco and K. P. Rykaczewski and N. T. Brewer and D. W. Stracener and Y. Liu and Z. Gai and C. Rouleau and J. Carter and J. Kostensalo and J. Suhonen and H. Davis and E. D. Lukosi and K. C. Goetz and R. K. Grzywacz and M. Mancuso and F. Petricca and A. Fijałkowska and M. Wolińska-Cichocka and J. Ninkovic and P. Lechner and R. B. Ickert and L. E. Morgan and P. R. Renne and I. Yavin},
journal= {arXiv preprint arXiv:2211.10319},
year = {2023}
}
备注
This is a companion paper to Hariasz et al (KDK collaboration) "Evidence for ground-state electron capture of ${}^{40}$K" [arXiv:2211.10343; DOI: 10.1103/PhysRevC.108.014327]. As such, both texts share some figures and portions of text. This version includes the journal DOI