The AMoRE: Search for Neutrinoless Double Beta Decay of 100Mo

The AMoRE (Advanced Mo-based Rare process Experiment) collaboration is using calcium molybdate ((CaMoO4)-Ca-dep48-Mo-100) crystals enriched in Mo-100 and depleted in Ca-48 to search for neutrinoless double-beta decay (DBD) of Mo-100 using at the underground laboratory in Korea. Metallic magnetic calorimeters operating a milliKelvin temperatures are used as temperature sensors to measure heat and light signals from the crystals. The simultaneous and fast detection capabilities for both phonons and photons, and their excellent energy resolution provide powerful methods for identifying DBD signals and rejecting background events, which are mainly due to random coincidences between two uncorrelated two-neutrino-double-beta decays of Mo-100. The AMoRE-Pilot experiment that is currently underway uses a 1.5 kg, five-element array of (CaMoO4)-Ca-dep48-Mo-100 crystals. The ultimate goal is a similar to 200 kg array of crystals and a half-life sensitivity of order 10(26) years, which will access the inverted hierarchy region for effective Majorana neutrino masses, i. e., 0.02 to 0.05 eV. In this talk, we present recent progress on the development of low-background calcium molybdate detectors and results from room-and milli-Kelvin temperatures. Sensitivities based on GEANT4 simulations that incorporate measured background are reported.