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Free keywords:
Neutrino mass and mixing; Majorana neutrino; beta-decay; double beta decay; Heidelberg–Moscow experiment; high purity Ge detectors
Abstract:
For the first time the expected pulse shapes to be observed for neutrinoless double beta events in a big
76Ge detector have been calculated starting from their Monte Carlo calculated time history and spatial energy distribution. It is shown that with the spatial resolution of a large size Ge detector for the majority of 0νββ events it is not possible to differentiate between the contributions of different particle physics parameters entering into the 0νββ decay process — in the mass mechanism the effective neutrino mass and the right-handed weak current parameters λ, η. It is shown that on the other hand it is possible in a 76Ge double beta decay experiment to reject a background of larger sizes (high multiplicity) gamma events by selecting low size (low multiplicity) events. First comparison of the theoretical ββ pulses to events from the line observed at3,4 Qββ shows very good agreement. It is shown further that a rather good radial position determination of ββ events in the detector is possible. By the same type of calculation it is shown that use of the pulse shapes of the 1592 keV double escape line of the 2614 keV γ-transition from 228Th for calibrating a neuronal net for search of events of neutrinoless double beta decay should be helpful.
