First limits on double beta decays in $$^\mathbf{232}$$ 232 Th

• Main Authors: M. Laubenstein, B. Lehnert, S. S. Nagorny
• Format: Article
• Language: English
• Published: SpringerOpen 2020-08-01
• Series: European Physical Journal C: Particles and Fields
• Online Access: http://link.springer.com/article/10.1140/epjc/s10052-020-8281-3

Abstract As one of the primordial radioactive isotopes, $$^{232}\mathrm{Th}$$ 232Th mainly undergoes $$\alpha $$ α -decay with a half-life of $$1.402\cdot 10^{10}$$ 1.402·1010  years. However, it is also one of 35 double beta decay candidates in which the single $$\beta $$ β -decay is forbidden or strongly suppressed. 181 mg of thorium contained in a gas mantle were measured in a HPGe well-detector at the Gran Sasso Underground Laboratory with a total exposure of 3.25 g$$\times $$ × d. We obtain half-life limits on all double beta decay modes of $$^{232}\mathrm{Th}$$ 232Th to excited states of $$^{232}\mathrm{U}$$ 232U on the order of $$10^{11-15}$$ 1011-15  years. For the most likely transition into the 0$$^+_1$$ 1+ state we find a lower half-life limit of $$6.7\cdot 10^{14}$$ 6.7·1014  years (90% C.I.). These are the first constraints on double beta decay excited state transition in $$^{232}\mathrm{Th}$$ 232Th .