Kim, KW, Adhikari, G, Souza, EBD et al. (50 more authors) (2021) Identification of new isomers in ^228Ac : impact on dark matter searches. The European Physical Journal C, 81 (8). 746. ISSN 1434-6044
Abstract
We report the discovery of two metastable isomeric states of 228Ac at 6.28\,keV and 20.19\,keV, with lifetimes of 299±11\,ns and 115±25\,ns, respectively. These states are produced by the β-decay of 228Ra, a component of the 232Th decay chain, with β Q-values of 39.52\,keV and 25.61\,keV, respectively. Due to its low Q-value as well as the relative abundance of 232Th and their progeny in low background experiments, these observations potentially impact the low-energy background modeling of dark matter search experiments.
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Item Type: | Article |
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Copyright, Publisher and Additional Information: | © 2021 The Authors. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 25 Mar 2021 07:27 |
Last Modified: | 23 Aug 2021 10:34 |
Status: | Published |
Publisher: | Springer Nature |
Refereed: | Yes |
Identification Number: | 10.1140/epjc/s10052-021-09473-2 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:172528 |
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