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희귀 핵 연구단
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Measurement of the Background Activities of a 100Mo-enriched Powder Sample for an AMoRE Crystal Material by Using a Single High-Purity Germanium Detector

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Title
Measurement of the Background Activities of a 100Mo-enriched Powder Sample for an AMoRE Crystal Material by Using a Single High-Purity Germanium Detector
Author(s)
Su-yeon Park; Insik Hahn; Woon Gu Kang; Gowoon Kim; Eunkyung Lee; Douglas S. Leonard; Vladimir Kazalov; Yeong Duk Kim; Moo Hyun Lee; Elena Sala
Subject
100Mo-enriched powder, ; High-purity germanium detector, ; Neutrinoless double-beta decay, ; Radioisotope contamination
Publication Date
2020-06
Journal
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.76, no.12, pp.1060 - 1066
Publisher
KOREAN PHYSICAL SOC
Abstract
© 2020, The Korean Physical Society. The Advanced Molybdenum-based Rare process Experiment (AMoRE) searches for neutrino-less double-beta (0νββ) decay of 100Mo in enriched molybdate crystals. The AMoRE crystals must have low levels of radioactive contamination to achieve low background signals with energies near the Q-value of the 100Mo 0νββ decay. To produce low-activity crystals, radioactive contaminants in the raw materials used to form the crystals must be controlled and quantified. 100EnrMoO3 powder, which is enriched in the 100Mo isotope, is of particular interest as it is the source of 100Mo in the crystals. A high-purity germanium detector having 100% relative efficiency, named CC1, is being operated in the Yangyang underground laboratory. Using CC1, we collected a gamma spectrum from a 1.6-kg 100EnrMoO3 powder sample enriched to 96.4% in 100Mo. Activities were analyzed for the isotopes 228Ac, 228Th, 226Ra, and 40K. They are long-lived naturally occurring isotopes that can produce background signals in the region of interest for AMoRE. Activities of both 228Ac and 228Th were < 1.0 mBq/kg at 90% confidence level (C.L.). The activity of 226Ra was measured to be 5.1 ± 0.4 (stat) ± 2.2 (syst) mBq/kg. The 40K activity was found as < 16.4 mBq/kg at 90% C.L
URI
https://pr.ibs.re.kr/handle/8788114/8760
DOI
10.3938/jkps.76.1060
ISSN
0374-4884
Appears in Collections:
Center for Axion and Precision Physics Research(액시온 및 극한상호작용 연구단) > 1. Journal Papers (저널논문)
Center for Exotic Nuclear Studies(희귀 핵 연구단) > 1. Journal Papers (저널논문)
Center for Underground Physics(지하실험 연구단) > 1. Journal Papers (저널논문)
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