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# Final results on $^{82}{Se}$ double beta decay to the ground state of $^{82}{Kr}$ from the NEMO-3 experiment

Abstract : Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay ( $2\nu \beta \beta$ ) half-life of$^{82}$ Se as $T_{\smash {1/2}}^{2\nu } \!=\! \left[ 9.39 \pm 0.17\left( \text{ stat }\right) \pm 0.58\left( \text{ syst }\right) \right] \times 10^{19}$  y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is $\left| M^{2\nu }\right| = 0.0498 \pm 0.0016$ . In addition, a search for neutrinoless double beta decay ( $0\nu \beta \beta$ ) using 0.93 kg of$^{82}$ Se 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 $T_{1/2}^{0\nu } > 2.5 \times 10^{23} \,\text{ y } \,(90\%\,\text{ C.L. })$ for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of $\langle m_{\nu } \rangle < \left( 1.2{-}3.0\right) \,\text{ eV }$ , 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.
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https://hal.archives-ouvertes.fr/hal-01827977
Contributor : Inspire Hep <>
Submitted on : Monday, July 2, 2018 - 9:16:43 PM
Last modification on : Wednesday, October 21, 2020 - 9:20:45 PM

### Citation

R. Arnold, C. Augier, A.S. Barabash, A. Basharina-Freshville, S. Blondel, et al.. Final results on $^{82}{Se}$ double beta decay to the ground state of $^{82}{Kr}$ from the NEMO-3 experiment. Eur.Phys.J.C, 2018, 78 (10), pp.821. ⟨10.1140/epjc/s10052-018-6295-x⟩. ⟨hal-01827977⟩

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