Search for the double-beta decay of $^{82}$Se to the excited states of $^{82}$Kr with NEMO-3
PIQUEMAL, F.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
Laboratoire Souterrain de Modane [LSMUMR6417]
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Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
Laboratoire Souterrain de Modane [LSMUMR6417]
Language
en
Article de revue
This item was published in
Nuclear Physics A. 2020, vol. 996, p. 121701
Elsevier
English Abstract
The double-beta decay of 82Se to the 0+1 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 ...Read more >
The double-beta decay of 82Se to the 0+1 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 gamma-rays has been performed to search for events in the 2e2g channel. No evidence of a 2nbb decay to the 0+1 state has been observed and a limit of T2n 1/2(82Se; 0+gs -> 0+1) > 1.3 1021 y at 90% CL has been set. Concerning the 0nbb decay to the 0+1 state, a limit for this decay has been obtained with T0n 1/2(82Se; 0+g s -> 0+1) > 2.3 1022 y at 90% CL, independently from the 2nbb decay process. These results are obtained for the first time with a tracko-calo detector, reconstructing every particle in the final state.Read less <
English Keywords
double-beta decay
selenium: nuclide
krypton: nuclide
nucleus: excited state
gamma ray: particle identification
Neutrino Ettore Majorana Observatory
experimental results
Origin
Hal imported