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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Identification of new isomers in Ac-228: impact on dark matter searches

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Author(s):
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Kim, K. W. [1] ; Adhikari, G. [2] ; de Souza, E. Barbosa [3, 4] ; Carlin, N. [5] ; Choi, J. J. [6] ; Choi, S. [6] ; Djamal, M. [7] ; Ezeribe, A. C. [8] ; Franca, L. E. [5] ; Ha, C. [9] ; Hahn, I. S. [10, 11, 12] ; Jeon, E. J. [1] ; Jo, J. H. [3, 4] ; Kang, W. G. [1] ; Kauer, M. [13, 14] ; Kim, H. [1] ; Kim, H. J. [15] ; Kim, S. H. [1] ; Kim, S. K. [6] ; Kim, W. K. [1, 11] ; Kim, Y. D. [16, 1, 11] ; Kim, Y. H. [17, 1, 11] ; Ko, Y. J. [1] ; Lee, E. K. [1] ; Lee, H. [1, 11] ; Lee, H. S. [1, 11] ; Lee, H. Y. [1] ; Lee, I. S. [1] ; Lee, J. [1] ; Lee, J. Y. [6] ; Lee, M. H. [1, 11] ; Lee, S. H. [1, 11] ; Lee, S. M. [6] ; Leonard, D. S. [1] ; Manzato, B. B. [5] ; Maruyama, R. H. [3, 4] ; Neal, R. J. [8] ; Olsen, S. L. [1] ; Park, B. J. [1, 11] ; Park, H. K. [18] ; Park, H. S. [17] ; Park, K. S. [1] ; Pitta, R. L. C. [5] ; Prihtiadi, H. [1] ; Ra, S. J. [1] ; Rott, C. [19] ; Shin, K. A. [1] ; Scarff, A. [8] ; Spooner, N. J. C. [8] ; Thompson, W. G. [3, 4] ; Yang, L. [2] ; Yu, G. H. [19] ; Collaboration, COSINE-100
Total Authors: 53
Affiliation:
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[1] Inst Basic Sci IBS, Ctr Underground Phys, Daejeon 34126 - South Korea
[2] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 - USA
[3] Yale Univ, Dept Phys, New Haven, CT 06520 - USA
[4] Yale Univ, Wright Lab, New Haven, CT 06520 - USA
[5] Univ Sao Paulo, Phys Inst, BR-05508090 Sao Paulo - Brazil
[6] Seoul Natl Univ, Dept Phys & Astron, Seoul 08826 - South Korea
[7] Bandung Inst Technol, Dept Phys, Bandung 40132 - Indonesia
[8] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire - England
[9] Chung Ang Univ, Dept Phys, Seoul 06973 - South Korea
[10] Ewha Womans Univ, Dept Sci Educ, Seoul 03760 - South Korea
[11] Univ Sci & Technol UST, IBS Sch, Daejeon 34113 - South Korea
[12] Inst Basic Sci IBS, Ctr Exot Nucl Studies, Daejeon 34126 - South Korea
[13] Univ Wisconsin, Dept Phys, Madison, WI 53706 - USA
[14] Univ Wisconsin, Wisconsin IceCube Particle Astrophys Ctr, Madison, WI 53706 - USA
[15] Kyungpook Natl Univ, Dept Phys, Daegu 41566 - South Korea
[16] Sejong Univ, Dept Phys & Astron, Seoul 05006 - South Korea
[17] Korea Res Inst Stand & Sci, Daejeon 34113 - South Korea
[18] Korea Univ, Dept Accelerator Sci, Sejong 30019 - South Korea
[19] Sungkyunkwan Univ, Dept Phys, Seoul 16419 - South Korea
Total Affiliations: 19
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL C; v. 81, n. 8 AUG 2021.
Web of Science Citations: 0
Abstract

We report the identification of metastable isomeric states of Ac-228 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 beta-decay of Ra-228, a component of the Th-232 decay chain, with beta Q-values of 39.52 keV, 39.13 keV and 25.61 keV, respectively. Due to the low Q-value of Ra-228 as well as the relative abundance of Th-232 and their progeny in low background experiments, these observations potentially impact the low-energy background modeling of dark matter search experiments. (AU)

FAPESP's process: 17/02952-0 - Search for dark matter: WIMPs and dark photons
Grantee:Nelson Carlin Filho
Support Opportunities: Regular Research Grants