MOON (Mo Observatory Of Neutrinos) for double beta decay

The MOON (Molybdenum Observatory Of Neutrinos) project aims at studies of double beta decays with a high sensitivity of m ν > ∼ 0.03  eV and real-time studies of low-energy solar neutrinos. Two β rays from 100 Mo are measured in coincidence for the 0 νββ studies. The inverse β rays from solar neutrino captures of 100 Mo are measured in delayed coincidence with the following β decay of 100 Tc. Measurements with good energy resolution and good position resolution enable one to select true signals. A prototype MOON detector (MOON 1) is now under development. The present report describes briefly the outline of the MOON project and the status of MOON 1.