Speaker
Description
Observation of neutrinoless double beta (0$\nu\beta\beta$) decay can reveal the neutrino properties beyond the Standard Model. AMoRE searches for the 0$\nu\beta\beta$ decay of molybdenum-100 using the isotope in the form of scintillation crystals equipped with the cryogenic detector system in the underground laboratory. In the first two phases of AMoRE using $^{48\mathrm{depl}}\mathrm{Ca}^{100}\mathrm{MoO}_{4}$ and $\mathrm{Li}_{2}{}^{100}\mathrm{MoO}_{4}$ crystals, working principles and stability for a long-term operation of the detector have been demonstrated, and the half-life of Mo-100 0$\nu\beta\beta$ decay have been constrained at $T^{0\nu}_{1/2}>2.9\times10^{24}$ years at 90% confidence level. The AMoRE-II detector is under preparation for its data taking to be started in 2025. AMoRE-II will be conducted using 157 kg of $^{100}$Mo-based crystals for longer than 5 years. With a background level below $2\times10^{-4}$ count/keV/kg/year at the energy around the $Q$-value at 3.034 MEV, we expect the experimental sensitivity about $T^{0\nu}_{1/2}\sim4\times10^{26}$ years, or in terms of the effective Majorana mass $m_{\beta\beta}\sim25-73$ meV for the exclusion limit at 90% confidence level, covering most parameter space in the inverse mass ordering scenario.
