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Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3

Arnold, R; Augier, C; Barabash, AS; Basharina-Freshville, A; Blondel, S; Blot, S; Bongrand, M; ... Tretyak, VI; + view all (2020) Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3. Nuclear Physics A , 996 , Article 121701. 10.1016/j.nuclphysa.2020.121701. Green open access

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Abstract

The double-beta decay of 82Se to the 01+ excited state of 82Kr has been studied with the NEMO-3 detector using 0.93 kg of enriched 82Se measured for 4.75 y, corresponding to an exposure of 4.42 kg⋅y. A dedicated analysis to reconstruct the γ-rays has been performed to search for events in the 2e2γ channel. No evidence of a 2νββ decay to the 01+ state has been observed and a limit of T1/22ν(Se82,0gs+→01+)>1.3×1021y at 90% CL has been set. Concerning the 0νββ decay to the 01+ state, a limit for this decay has been obtained with T1/20ν(Se82,0gs+→01+)>2.3×1022y at 90% CL, independently from the 2νββ decay process. These results are obtained for the first time with a tracko-calo detector, reconstructing every particle in the final state.

Type: Article
Title: Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.nuclphysa.2020.121701
Publisher version: https://doi.org/10.1016/j.nuclphysa.2020.121701
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Double beta decay, Neutrino, 82Se, Excited state
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10092440
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