Abstract
The NEMO-3 experiment measured the half-life of the decay and searched for the decay of . Using 410 g of installed in the detector with an exposure of 5.26 y, () events corresponding to the decay of to the ground state of have been observed with a signal to background ratio of about 12. The half-life of the decay has been measured to be . No events have been observed above the expected background while searching for decay. The corresponding limit on the half-life is determined to be at the 90% C.L. which corresponds to an upper limit on the effective Majorana neutrino mass of depending on the nuclear matrix elements considered. Limits on other mechanisms generating decay such as the exchange of R-parity violating supersymmetric particles, right-handed currents and majoron emission are also obtained.
3 More- Received 11 October 2016
DOI:https://doi.org/10.1103/PhysRevD.95.012007
© 2017 American Physical Society