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.

Arnold, R., Augier, C., Barabash, A., Basharina-Freshville, A., Blondel, S., Blot, S., et al. (2020). Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3. NUCLEAR PHYSICS. A, 996 [10.1016/j.nuclphysa.2020.121701].

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

Cascella M.;Minotti A.;
2020

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.
Articolo in rivista - Articolo scientifico
82; Se; Double beta decay; Excited state; Neutrino;
English
2020
996
121701
reserved
Arnold, R., Augier, C., Barabash, A., Basharina-Freshville, A., Blondel, S., Blot, S., et al. (2020). Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3. NUCLEAR PHYSICS. A, 996 [10.1016/j.nuclphysa.2020.121701].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/316677
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