"Investigating the Majorana nature of neutrinos,
               Galactic Dark Matter and Solar Axions Searches
               using thermal detectors in low background observatories"
Prof. Carmine E. Pagliarone 
Università degli Studi di Cassio e del Lazio Meridionale, Italia
Neutrinos were proposed by W. Pauli as a remedy to explain 
nuclear beta decay. Now they are essential in our understanding 
of the Universe. In this talk I will show how Neutrino-less 
Double Beta Decay has a key role in determining the Majorana 
versus Dirac nature of neutrinos and as confirmation of neutrino 
mass values different from zero, as proofed by neutrino oscillation 
experiments. Neutrino-less Double Beta Decay studies require, 
in particular, the use of high-energy resolution detectors such 
as thermal detectors in low background observatories. The large 
detector mass of some thermal detector, the low energy threshold 
of a few keV and low background environment make such a kind of 
experiment well suited for direct detection of galactic Dark 
Matter particles and solar Axions.