The AMoRE collaboration searches for neutrinoless double beta decay of 100 Mo using molybdate scintillating crystals via low temperature thermal calorimetric detection. The early phases of the experiment, AMoRE-pilot and AMoRE-I, have demonstrated competitive discovery potential. Presently, the AMoRE-II experiment, featuring a large detector array with about 90 kg of 100 Mo isotope, is under construction. This paper discusses the baseline design and characterization of the lithium molybdate cryogenic calorimeters to be used in the AMoRE-II detector modules. The results from prototype setups that incorporate new housing structures and two different crystal masses (316 g and 517–521 g), operated at 10 mK temperature, show energy resolutions (FWHM) of 7.55–8.82 keV at the 2.615 MeV 208 Tl γ line and effective light detection of 0.79–0.96 keV/MeV. The simultaneous heat and light detection enables clear separation of alpha particles with a discrimination power of 12.37–19.50 at the energy region around 6 Li (η,α)3 H with Q-value = 4.785 MeV. Promising detector performances were demonstrated at temperatures as high as 30 mK, which relaxes the temperature constraints for operating the large AMoRE-II array.
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Agrawal, A., Alenkov, V., Aryal, P., Beyer, J., Bhandari, B., Boiko, R., Boonin, K., Buzanov, O., Byeon, C., Chanthima, N., Cheoun, M., Choe, J., Choi, S., Choudhury, S., Chung, J., Danevich, F., Djamal, M., Drung, D., Enss, C., Fleischmann, A., Gangapshev, A., Gastaldo, L., Gavrilyuk, Y., Gezhaev, A., Gileva, O., Grigorieva, V., Gurentsov, V., Ha, C., Ha, D., Ha, E., Hwang, D., Jeon, E., Jeon, J., Jo, H., Kaewkhao, J., Kang, C., Kang, W., Kazalov, V., Kempf, S., Khan, A., Khan, S., Kim, D., Kim, G., Kim, H., Kim, H.-J., Kim, H., Kim, H., Kim, H., Kim, M., Kim, S., Kim, S., Kim, S., Kim, W., Kim, Y., Kim, Y., Kirdsiri, K., Ko, Y., Kobychev, V., Kornoukhov, V., Kuzminov, V., Kwon, D., Lee, C., Lee, D., Lee, E., Lee, H., Lee, H., Lee, J., Lee, J., Lee, K., Lee, M., Lee, M., Lee, S., Lee, Y., Leonard, D., Lim, H., Mailyan, B., Makarov, E., Nyanda, P., Oh, Y., Olsen, S., Panasenko, S., Park, H., Park, H., Park, K., Park, S., Polischuk, O., Prihtiadi, H., Ra, S., Ratkevich, S., Rooh, G., Sala, E., Sari, M., Seo, J., Seo, K., Sharma, B., Shin, K., Shlegel, V., Siyeon, K., So, J., Sokur, N., Son, J., Song, J., Srisittipokakun, N., Tretyak, V., Wirawan, R., Woo, K., Yeon, H., Yoon, Y., & Yue, Q. (2025). Development of MMC-based lithium molybdate cryogenic calorimeters for AMoRE-II. European Physical Journal C, 85, 1–13. https://www.doi.org/10.1140/epjc/s10052-024-13498-8
