The XIX International Conference on Topics in Astroparticle and Underground Physics (TAUP2025)

Study of Li2MoO4 and Na2Mo2O7 crystals for 100Mo neutrinoless double beta decay search with cryogenic bolometers:

27 Aug 2025, 17:00

20m

North Hall #2

Oral Neutrino Physics and Astrophysics Neutrino Physics and Astrophysics

Speaker

Mr Deyong Duan (University of Science and Technology of China)

Description

The novel molybdate crystals, Li2MoO4 (LMO) and Na2Mo2O7 (NMO), are popular used as absorbers in cryogenic phonon scintillating bolometers for 100Mo neutrinoless double beta decay search. The low temperature properties of LMO and NMO, including scintillation characteristics and specific heat, have been investigated experimentally. The excitation spectrum and light yield are measured ranging from 10 K to room temperature; and the heat capacities of these two crystals measured at O(200) mK demonstrate that the results are consistent with the prediction of Debye model. Consequently, a 2-cm cubic LMO bolometer is setup and running in a ground cryostat at ultra-low temperature mK-level. The energy resolution as FWHM has achieved at 7 keV@511 keV.