Speaker
Description
The AMoRE (Advanced Mo-based Rare process Experiment) aims to study the double beta decay of 100Mo in order to gain insights into neutrino masses using a cryogenic technique. The study of 2vββ decay from 100Mo to an excited state of 100Ru helps us understand nuclear matrix elements and nuclear models as well as search for the bosonic (symmetric) fraction of the neutrino wave function.
The AMoRE-I consists of 18 enriched 100Mo-based scintillating crystal detectors at the Yangyang underground laboratory. Since in the two-neutrino double beta decay to the excited state two gamma and two beta particles are emitted, coincidence event selection using a multiplicity of crystals can reduce the background significantly. For instance, the detection efficiency for the decay of the 0+ excited state signal is approximately 30 times higher than ground state in multiplicity of 2. Additionally, in the signal with a multiplicity of 3, the beta energy distribution can be measured.
The AMoRE-II is under construction at a 1000 m deep Yemi underground laboratory, aiming for a tonne-year exposure of 100Mo. A simulation study for observing the beta energy of the 0+ and verifying events from the decay to the forbidden 2+ excited state has been initiated.
