Search for neutrino-less double beta decay of 48 Ca by CaF2 scintillator
2004
AC aF 2 scintillation detector system (ELEGANT VI) has been operating at Oto Cosmo Observatory to study double beta decays of 48 Ca. No events were observed around the Q-value energy region after the analysis of 4.23 kg yr data. To derive the lower limit for the half-life of the neutrino-less double beta decay of 48 Ca, the expected number of background events in that energy region was estimated by a Monte Carlo simulation using the measured activities of 214 Bi and 220 Rn inside CaF2 crystals. A new lower limit is obtained to be 1.4 × 10 22 yr at the 90% C.L. An experimental sensitivity is 5.9 × 10 21 yr at the 90% C.L.
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