The Evidence for the Observation of 0νββ Decay:. the Identification of 0νββ Events from the Full Spectra
Abstract
In this brief review, a description of the observed evidence for neutrinoless double beta3-5 in the 76Ge experiment in Gran Sasso (Heidelberg-Moscow experiment) which has been operated with 11 kg enriched 76Ge detectors in the period 1990-2003, is provided. Two different methods of pulse shape analysis have been used to select potential 0νββ events from the γ background of the measured spectrum — a selection by a neuronal net approach,3,4,16 and a selection by a new method comparing measured pulses with a library of pulse shapes of point-like events calculated from simulation of the electric field distribution in the detectors (see Refs. 6-8 and 37). The latter method also allows spatial localization of measured events. Both methods lead to selections of events at Qββ with almost no γ-background. The observed line at Qββ is identified as a 0νββ signal. It has a confidence level of more than 6σ.
- Publication:
-
Modern Physics Letters A
- Pub Date:
- 2006
- DOI:
- 10.1142/S0217732306020937
- Bibcode:
- 2006MPLA...21.1547K
- Keywords:
-
- 14.60.Pq;
- 23.40.-s;
- 29.40.-n;
- 95.55.Vj;
- Neutrino mass and mixing;
- Beta decay;
- double beta decay;
- electron and muon capture;
- Radiation detectors;
- Neutrino muon pion and other elementary particle detectors;
- cosmic ray detectors