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Recebt results from the UCSB/LBL double beta decay experiment

1990; Elsevier BV; Volume: 13; Linguagem: Inglês

10.1016/0920-5632(90)90123-c

1873-3832

D. O. Caldwell, R. M. Eisberg, F.S. Goulding, Björn Magnusson, A. R. Smith, M. S. Witherell,

Dark Matter and Cosmic Phenomena

A new limit has been set on neutrinoless double beta decay, a process which would require lepton number nonconservation, plus one other piece of new physics. That second item might be light Majorana electron neutrino mass, a very heavy Majorana neutrino, right-handed currents, or supersymmetric particles in theories with R-parity violation. Limits on all these quantities can be obtained from the result that the UCSB/LBL Ge multidetector system shows the halflife for 76Ge → 76Se + 2e−to be > 1.2 × 1024y at the 90% confidence level or >2.4 × 1024y at the 68% confidence level.