Identification of new isomers in $^{228}$Ac : Impact on dark matter searches
High Energy Physics - Experiment
2021-08-24 v3 Nuclear Experiment
Abstract
We report the identification of metastable isomeric states of Ac at 6.28 keV, 6.67 keV and 20.19 keV, with lifetimes of an order of 100 ns. These states are produced by the -decay of Ra, a component of the Th decay chain, with Q-values of 39.52 keV, 39.13 keV and 25.61 keV, respectively. Due to its low Q-value as well as the relative abundance of Th and their progeny in low background experiments, these observations potentially impact the low-energy background modeling of dark matter search experiments.
Keywords
Cite
@article{arxiv.2103.02809,
title = {Identification of new isomers in $^{228}$Ac : Impact on dark matter searches},
author = {K. W. Kim and G. Adhikari and E. Barbosa de Souza and N. Carlin and J. J. Choi and S. Choi and M. Djamal and A. C. Ezeribe and L. E. Franca and C. Ha and I. S. Hahn and E. J. Jeon and J. H. Jo and H. W. Joo and W. G. Kang and M. Kauer and H. Kim and H. J. Kim and S. H. Kim and S. K. Kim and W. K. Kim and Y. D. Kim and Y. H. Kim and Y. J. Ko and E. K. Lee and H. Lee and H. S. Lee and H. Y. Lee and I. S. Lee and J. Lee and J. Y. Lee and M. H. Lee and S. H. Lee and S. M. Lee and D. S. Leonard and B. B. Manzato and R. H. Maruyama and R. J. Neal and S. L. Olsen and B. J. Park and H. K. Park and H. S. Park and K. S. Park and R. L. C. Pitta and H. Prihtiadi and S. J. Ra and C. Rott and K. A. Shin and A. Scarff and N. J. C. Spooner and W. G. Thompson and L. Yang and G. H. Yu},
journal= {arXiv preprint arXiv:2103.02809},
year = {2021}
}
Comments
9 pages, 9 figures