Speaker
Description
The neutrinoless double beta decay ($0\nu\beta\beta$) event, if observed, would verify the Majorana nature of neutrinos and provide strong support for one of the hypotheses explaining the matter-dominated universe. As a part of the CANDLES experiment, aiming to search for $0\nu\beta\beta$ of $^{48}$Ca, we develop CaF$_{2}$ detectors operating at millikelvin (mK) temperatures for phonon and scintillation detection. We employ magnetic microcalorimeters (MMCs), a type of high-resolution microcalorimeter that demonstrates exceptional energy sensitivity, as the primary detector technology. These MMCs are used to measure the heat signal from the energy deposit in a CaF$_{2}$ crystal and the light signals from scintillation photons emitted by the crystal. In this presentation, we report the performance of these detectors and outline the plan utilizing CaF$_{2}$ crystals for a $0\nu\beta\beta$ search experiment.
