Measurement of the 2νββ Decay Half-Life and Search for the 0νββ Decay of 116Cd with the NEMO-3 Detector

Abstract : The NEMO-3 experiment measured the half-life of the 2νββ decay and searched for the 0νββ decay of 116Cd. Using 410 g of 116Cd installed in the detector with an exposure of 5.26 y, (4968±74) events corresponding to the 2νββ decay of 116Cd to the ground state of 116Sn have been observed with a signal to background ratio of about 12. The half-life of the 2νββ decay has been measured to be T2ν1/2=[2.74±0.04(stat.)±0.18(syst.)]×1019 y. No events have been observed above the expected background while searching for 0νββ decay. The corresponding limit on the half-life is determined to be T0ν1/2≥1.0×1023 y at the 90 % C.L. which corresponds to an upper limit on the effective Majorana neutrino mass of ⟨mν⟩≤1.4−2.5 eV depending on the nuclear matrix elements considered. Limits on other mechanisms generating 0νββ decay such as the exchange of R-parity violating supersymmetric particles, right-handed currents and majoron emission are also obtained.
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Article dans une revue
Physical Review D, American Physical Society, 2017, 95, pp.012007. 〈10.1103/PhysRevD.95.012007〉
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http://hal.in2p3.fr/in2p3-01379915
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Soumis le : mercredi 12 octobre 2016 - 09:58:06
Dernière modification le : jeudi 18 janvier 2018 - 01:51:23

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R. Arnold, D. Duchesneau, T. Le Noblet, A Remoto, C. Augier, et al.. Measurement of the 2νββ Decay Half-Life and Search for the 0νββ Decay of 116Cd with the NEMO-3 Detector. Physical Review D, American Physical Society, 2017, 95, pp.012007. 〈10.1103/PhysRevD.95.012007〉. 〈in2p3-01379915〉

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