Spectral shape study of 210Bi forbidden beta decay using PbMoO4 cryogenic detectors

Spectral shape study of 210Bi forbidden beta decay using PbMoO4 cryogenic detectors Full article

Journal

AIP Conference Proceedings
ISSN: 0094-243X , E-ISSN: 1551-7616

Output data

Year: 2025, Volume: 3143, Number: 1, Article number : 020008, Pages count : DOI: 10.1063/5.0234751

Authors

Kim H.L. ¹ , Kim H.J. ² , So J.H. ¹ , Kim Y.H. ¹ , Kim Y.D. ¹ , Nagorny S.S. ³ , Shlegel V.N. ⁴

Affiliations

1	IBS, Daejeon, CUP
2	Kyungpook Natl. U.
3	Queen's U., Kingston
4	Novosibirsk, Inst. Inorganic Chem.

The spectrum-shape method has been proposed to determine the effective value of the axial-vector coupling constant, gA in forbidden non-unique β decays. 210Bi is an isotope of first-forbidden non-unique beta decay, the shape function of which strongly depends on the gA value. Due to the short half-life of the 210Bi, the 210Pb (β, 22.3 y) → 210Bi (β, 5.0 d) → 210Po (α, 138 d) decay chain has been adopted by using PbMoO4 crystals. We prepared a detection system with two PbMoO4 crystals in the same crystal dimensions. One PbMoO4 contains a modern lead and the 210Pb radioactivity was measured about 30 Bq/kg. The other PbMoO4 crystal consist of an archeological lead with low 210Pb radioactivity of about 0.2 Bq/kg, which has been used to subtract the external backgrounds. This detection method with the two crystals has shown a good agreement with a previous beta spectrum study of 210Bi.

Kim H.L. , Kim H.J. , So J.H. , Kim Y.H. , Kim Y.D. , Nagorny S.S. , Shlegel V.N.
Spectral shape study of 210Bi forbidden beta decay using PbMoO4 cryogenic detectors
AIP Conference Proceedings. 2025. V.3143. N1. 020008 . DOI: 10.1063/5.0234751 Scopus OpenAlex

Published print:

Feb 11, 2025

Scopus:	2-s2.0-85219094133
OpenAlex:	W4407385578

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