Final results on Se-82 double beta decay to the ground state of Kr-82 from the NEMO-3 experiment
- NázevTitle
- Final results on Se-82 double beta decay to the ground state of Kr-82 from the NEMO-3 experimentFinal results on Se-82 double beta decay to the ground state of Kr-82 from the NEMO-3 experiment
- Druh výsledkuResult type
- Článek v časopiseJournal article
- AutořiAuthors
- R. Arnold, C. Augier, A. S. Barabash, A. Basharina-Freshville, L. Fajt, R. Hodák, F. Mamedov, P. Přidal, E. Rukhadze, A. Smetana, K. Smolek, I. Štekl
- DOIDOI
- 10.1140/epjc/s10052-018-6295-x
- Časopis / citaceJournal / citation
- European Physical Journal C. 2018, 78(10), 1-15. ISSN 1434-6044.
- RokYear
- 2018
- JazykLanguage
- eng
- WoSWoS
- 000448424500001
- ScopusScopus
- 2-s2.0-85054855469
- RIVRIV
- RIV/68407700:21670/18:00325903!RIV19-MSM-21670___
- ProjektProject
- Podzemní laboratoř LSM - česká účast ve výzkumné infrastruktuře evropského významuUnderground laboratory LSM - Czech participation to European-level research infrastructure
AbstraktAbstract
Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay (2 nu beta beta) half-life of Se-82 as T-1/2(2 nu) = [9.39 +/- 0.17 (stat) +/- 0.58 (syst)] x 10(19) y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is vertical bar M-2 nu vertical bar = 0.0498 +/- 0.0016. In addition, a search for neutrinoless double beta decay (0 nu beta beta) using 0.93 kg of Se-82 observed for a total of 5.25 y has been conducted and no evidence for a signal has been found. The resulting half-life limit of T-1/2(0 nu) > 2.5 x 10(23) y (90% C.L.) for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of < m(nu)> < (1.2-3.0) eV, where the range reflects 0 nu beta beta nuclear matrix element values from different calculations. Furthermore, constraints on lepton number violating parameters for other 0 nu beta beta mechanisms, such as right-handed currents, majoron emission and R-parity violating supersymmetry modes have been set.
Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay (2 nu beta beta) half-life of Se-82 as T-1/2(2 nu) = [9.39 +/- 0.17 (stat) +/- 0.58 (syst)] x 10(19) y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is vertical bar M-2 nu vertical bar = 0.0498 +/- 0.0016. In addition, a search for neutrinoless double beta decay (0 nu beta beta) using 0.93 kg of Se-82 observed for a total of 5.25 y has been conducted and no evidence for a signal has been found. The resulting half-life limit of T-1/2(0 nu) > 2.5 x 10(23) y (90% C.L.) for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of < m(nu)> < (1.2-3.0) eV, where the range reflects 0 nu beta beta nuclear matrix element values from different calculations. Furthermore, constraints on lepton number violating parameters for other 0 nu beta beta mechanisms, such as right-handed currents, majoron emission and R-parity violating supersymmetry modes have been set.