Abstract
The search for neutrinoless double beta decay (0 νββ) is a key experiment for evaluating the mass of the neutrino and for determining the Majorana/Dirac nature of neutrinos. A scintillating CaMoO 4 crystal is a good material for use in investigating 0 νββ with cryogenic detectors. The high transition energy ( Q = 3034 keV) and nearly 10% natural abundance of 100Mo, together with the scintillating property of the crystal, provide favorable conditions to search for 0 νββ of 100Mo. We report a prototype experiment operating at low temperatures using a CaMoO 4 crystal as a particle absorber. Prior to testing of isotopically-enriched 40Ca 100MoO 4 crystals, a CaMoO 4 crystal with Mo of natural isotopic composition was tested. Using a metallic magnetic calorimeter as a temperature sensor, we achieved high energy resolutions for alpha particles and low-energy gamma rays. This experiment shows the feasibility of scaling up the crystal size to perform a high sensitivity search for 0 νββ decay of 100Mo.
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