Identification of new isomers in $$^{228}$$Ac: impact on dark matter searches

Identification of new isomers in $$^{228}$$Ac: impact on dark matter searches
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$$^{228}$$Ac 中新异构体的识别:对暗物质搜索的影响

DOI:
10.1140/epjc/s10052-021-09473-2
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发表时间:
2021
期刊:
The European Physical Journal C
影响因子:
--
通讯作者:
Ha, C.
Ha, C.
中科院分区:
--
文献类型:
--
作者:
Kim, K. W.;Adhikari, G.;de Souza, E. Barbosa;Carlin, N.;Choi, J. J.;Choi, S.;Djamal, M.;Ezeribe, A. C.;França, L. E.;Ha, C.

文献摘要

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我们在6.28keV,6.67keV和20.19keV的能级上发现了亚稳的异构态OFAC,其寿命约为100keV。这些态是由衰减链的一个成分-衰变态产生的,Q值分别为39.52keV、39.13keV和25.61keV。由于低本底实验中Ofra的低Q值以及Th及其子体的相对丰度,这些观测结果可能会影响暗物质搜索实验的低能背景模拟。
We report the identification of metastable isomeric states ofAc 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 ofRa, a component of theTh decay chain, withQ-values of 39.52 keV, 39.13 keV and 25.61 keV, respectively. Due to the low Q-value ofRa as well as the relative abundance ofTh and their progeny in low background experiments, these observations potentially impact the low-energy background modeling of dark matter search experiments.