DAMA/R&D

Other results achieved by using CaF2(Eu) detectors

1997 - First experimental limits on some 2β decays for the 40Ca 2EC2ν (studying K-shell X-rays):

τ > 6.6 x 1021 y (68% C.L.)

1998/1999 - New and improved experimental limits on some 2β decays in 46Ca:
τ > 1.0 x 1017 y (68% C.L.)

1999 - New and improved limits on 46Ca and 40Ca 2β decay processes (first and second lines: first experimental limits for the quoted processes; third line: highest existing limit for a 2β+ process):



2002 - New limits on β and 2β decay in 48Ca by coincidence technique

Decay modeT1/2 (y)
(90% C.L.)
β > 2.4 x 1018
2β 0ν (0+ → 2+) > 5.5 x 1019
2β 2ν (0+ → 2+) > 1.2 x 1018
The limit obtained for the β decay is roughly of the same order as the one previously available, the limit on 2β 0ν(0+ → 0+) is lower than the previously available one, while the 2β 2ν (0+ → 2+) has been set for the first time.