Abstract
The low-background, high-sensitivity Ge multidetector spectrometer TGV is used to study the double-beta decay of 48Ca. Additional suppression of the recorded background is achieved with neutron shielding and a method for distinguishing β particles from γ rays by detector-pulse rise time. The estimates T 1/2 γγ2ν = (4.2 ± 2.4) × 1019 yr and T 1/2 γγ0ν > 1.5 × 1021 yr (at a 90% C.L.) for the double-beta decay of 48Ca are obtained.
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