Various aspects and results on beta decay, DBD, COBRA and LFV

Various kinds of rare events can be studied but only a small fraction of these are mentioned in these proceedings. The search for rare events is quite some fun but also very hard work as typically very high backgrounds must be tackled for a very small signal. The first process discussed is double beta decay, which is an extremely rare process and requires half-live measurements around 1020 years for the neutrino accompanied mode, while for the neutrino-less mode much longer half-lives are already explored. Nuclear physics input is needed for the matrix elements and a quenching measurement of gA will be presented. In this case the focus is on the highly forbidden Cd-113 beta decay. New half-lives for the forbidden EC/beta decay measurement of V-50 will be presented. In addition new precision half-lives of long-living alpha decays will be presented as well.Various kinds of rare events can be studied but only a small fraction of these are mentioned in these proceedings. The search for rare events is quite some fun but also very hard work as typically very high backgrounds must be tackled for a very small signal. The first process discussed is double beta decay, which is an extremely rare process and requires half-live measurements around 1020 years for the neutrino accompanied mode, while for the neutrino-less mode much longer half-lives are already explored. Nuclear physics input is needed for the matrix elements and a quenching measurement of gA will be presented. In this case the focus is on the highly forbidden Cd-113 beta decay. New half-lives for the forbidden EC/beta decay measurement of V-50 will be presented. In addition new precision half-lives of long-living alpha decays will be presented as well.