Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-07-15
Physics
High Energy Physics
High Energy Physics - Phenomenology
Lecture notes for course CLXX "MEASUREMENTS OF NEUTRINO MASS" Int. School of Physics "Enrico Fermi", Varenna, June 2008
Scientific paper
Comprehensive description of the phenomenology of the $\beta\beta$ decay is given, with emphasis on the nuclear physics aspects. After a brief review of the neutrino oscillation results and of motivation to test the lepton number conservation, the mechanism of the $0\nu\beta\beta$ is discussed. Its relation to the lepton flavor violation involving charged leptons and its use as a diagnostic tool of the $0\nu\beta\beta$ mechanism is described. Next the basic nuclear physics of both $\beta\beta$-decay modes is presented, and the decay rate formulae derived. The nuclear physics methods used, the nuclear shell model and the quasiparticle random phase approximation, are described next, and the choice of input parameters is discussed in the following section. Finally, the numerical values of the nuclear matrix elements, and their uncertainty, are presented. In the appendix the relation of the search for the neutrino magnetic moment to the Dirac versus Majorana nature of neutrinos is described.
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