We report on the measurement of the two-neutrino double-β decay of Se82 performed for the first time with cryogenic calorimeters, in the framework of the CUPID-0 experiment. With an exposure of 9.95 kg yr of ZnSe82, we determine the two-neutrino double-β decay half-life of Se82 with an unprecedented precision level, T1/22ν=[8.60±0.03(stat) -0.13+0.19(syst)]×1019 yr. The very high signal-to-background ratio, along with the detailed reconstruction of the background sources allowed us to identify the single state dominance as the underlying mechanism of such a process, demonstrating that the higher state dominance hypothesis is disfavored at the level of 5.5σ.

Azzolini, O., Beeman, J., Bellini, F., Beretta, M., Biassoni, M., Brofferio, C., et al. (2019). Evidence of Single State Dominance in the Two-Neutrino Double- β Decay of Se 82 with CUPID-0. PHYSICAL REVIEW LETTERS, 123(26) [10.1103/PhysRevLett.123.262501].

Evidence of Single State Dominance in the Two-Neutrino Double- β Decay of Se 82 with CUPID-0

Beretta, M.;Biassoni, M.;Brofferio, C.;Capelli, S.;Carniti, P.;Chiesa, D.;Clemenza, M.;Cremonesi, O.;Gironi, L.;Giuliani, A.;Gorla, P.;Gotti, C.;Martinez, M.;Nastasi, M.;Nones, C.;Orlandi, D.;Pagnanini, L.
;
Pattavina, L.;Pavan, M.;Pessina, G.;Pozzi, S.;Previtali, E.;Puiu, A.;Vignati, M.;
2019

Abstract

We report on the measurement of the two-neutrino double-β decay of Se82 performed for the first time with cryogenic calorimeters, in the framework of the CUPID-0 experiment. With an exposure of 9.95 kg yr of ZnSe82, we determine the two-neutrino double-β decay half-life of Se82 with an unprecedented precision level, T1/22ν=[8.60±0.03(stat) -0.13+0.19(syst)]×1019 yr. The very high signal-to-background ratio, along with the detailed reconstruction of the background sources allowed us to identify the single state dominance as the underlying mechanism of such a process, demonstrating that the higher state dominance hypothesis is disfavored at the level of 5.5σ.
Si
Articolo in rivista - Articolo scientifico
Scientifica
Double beta decay, exited states, nuclear model
English
Azzolini, O., Beeman, J., Bellini, F., Beretta, M., Biassoni, M., Brofferio, C., et al. (2019). Evidence of Single State Dominance in the Two-Neutrino Double- β Decay of Se 82 with CUPID-0. PHYSICAL REVIEW LETTERS, 123(26) [10.1103/PhysRevLett.123.262501].
Azzolini, O; Beeman, J; Bellini, F; Beretta, M; Biassoni, M; Brofferio, C; Bucci, C; Capelli, S; Cardani, L; Carniti, P; Casali, N; Chiesa, D; Clemenza, M; Cremonesi, O; Cruciani, A; Dafinei, I; Di Domizio, S; Ferroni, F; Gironi, L; Giuliani, A; Gorla, P; Gotti, C; Keppel, G; Kotila, J; Martinez, M; Nagorny, S; Nastasi, M; Nisi, S; Nones, C; Orlandi, D; Pagnanini, L; Pallavicini, M; Pattavina, L; Pavan, M; Pessina, G; Pettinacci, V; Pirro, S; Pozzi, S; Previtali, E; Puiu, A; Rusconi, C; Schäffner, K; Tomei, C; Vignati, M; Zolotarova, A
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.123.262501.pdf

Solo gestori archivio

Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Dimensione 343.9 kB
Formato Adobe PDF
343.9 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/255378
Citazioni
  • Scopus 31
  • ???jsp.display-item.citation.isi??? 27
Social impact