The 43rd International Symposium on Physics in Collision - PIC 2024

Search for neutrinoless double beta decay at AMoRE

23 Oct 2024, 15:00

20m

Mini Coference Hall, Videoconference via https://us02web.zoom.us/j/83584205236

Parallel Session 2

Speaker

Dr Yoomin Oh (Center for Underground Physics, Institute for Basic Science)

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 $T_{1/2}^{0\nu }>2.9\times {10}^{24}$ 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 $2\times {10}^{-4}$ count/keV/kg/year at the energy around the $Q$-value at 3.034 MEV, we expect the experimental sensitivity about $T_{1/2}^{0\nu }\sim 4\times {10}^{26}$ years, or in terms of the effective Majorana mass $m_{\beta \beta }\sim 25-73$ meV for the exclusion limit at 90% confidence level, covering most parameter space in the inverse mass ordering scenario.

Presentation materials

yoomin_AMoRE_PIC2024.pdf