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Kim, Gowoon
지하실험 연구단
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Improved intensities for the gamma transitions with E-gamma > 3 MeV from Pb-208

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Title
Improved intensities for the gamma transitions with E-gamma > 3 MeV from Pb-208
Author(s)
Gowoon Kim; Kevin Insik Hahn; Woon Gu Kang; Yeongduk Kim; Eun Kyoung Lee; Moo Hyun Lee; Leonard Douglas; Su-Yeon Park
Publication Date
2020-12
Journal
Physical Review c, v.102, no.6, pp.1 - 7
Publisher
AMER PHYSICAL SOC
Abstract
Pb-208 is a doubly magic nucleus which has been studied extensively by many experiments and nuclear models. Its properties, such as excitation energies, spins, and parities of the ground and excited states are well known. However, some gamma transitions with E-gamma > 3 MeV from the excited states to the ground state in Pb-208 have never been observed. The intensities of these gamma transitions are important issues for 0 nu beta beta decay searches because these transitions can make non-negligible background signals depending on their intensities. We conducted a measurement to search for the 3197.7, 3475.1, and 3708.4 keV transitions, which are emitted from the second, third, and fourth excited states in Pb-208, respectively. A 2 kg ThO2 sample was measured using a 100% relative efficiency high-purity germanium detector for 39.5 days at Y2L, an underground laboratory in Yangyang, Korea. We improved upper limits for intensities of the 3197.7, 3475.1, and 3708.4 keV gamma transitions as <1.2 x 10(-4)%, <1.4 x 10(-4)%, and <1.2 x 10(-4)%, respectively. These upper limits are at least a factor of 19 better than the previous results.
URI
https://pr.ibs.re.kr/handle/8788114/9087
DOI
10.1103/PhysRevC.102.064306
ISSN
2469-9985
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > 1. Journal Papers (저널논문)
Center for Exotic Nuclear Studies(희귀 핵 연구단) > 1. Journal Papers (저널논문)
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