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Development of MMC-based Lithium Molybdate Cryogenic Calorimeters for AMoRE-II

A. Agrawal,V. V. Alenkov,P. Aryal, H. Bae, J. Beyer, B. Bhandari,R. S. Boiko,K. Boonin,O. Buzanov,C. R. Byeon,N. Chanthima,M. K. Cheoun,J. S. Choe, S. Choi, S. Choudhury, J. S. Chung, F. A. Danevich,M. Djamal, D. Drung, C. Enss, A. Fleischmann, A. M. Gangapshev, L. Gastaldo,Y. M. Gavrilyuk,A. M. Gezhaev,O. Gileva,V. D. Grigorieva,V. I. Gurentsov, C. Ha, D. H. Ha,E. J. Ha, D. H. Hwang, E. J. Jeon, J. A. Jeon, H. S. Jo, J. Kaewkhao, C. S. Kang, W. G. Kang, V. V. Kazalov, S. Kempf, A. Khan, S. Khan,D. Y. Kim,G. W. Kim, H. B. Kim, H. J. Kim, H. L. Kim, H. S. Kim, M. B. Kim, S. C. Kim, S. K. Kim, S. R. Kim, W. T. Kim,Y. D. Kim, Y. H. Kim,K. Kirdsiri, Y. J. Ko, V. V. Kobychev,V. Kornoukhov, V. V. Kuzminov, D. H. Kwon, C. H. Lee, D. Y. Lee, E. K. Lee, H. J. Lee, H. S. Lee, J. Lee, J. Y. Lee, K. B. Lee, M. H. Lee, M. K. Lee, S. W. Lee, Y. C. Lee, D. S. Leonard, H. S. Lim,B. Mailyan,E. P. Makarov, P. Nyanda, Y. Oh,S. L. Olsen,S. I. Panasenko, H. K. Park, H. S. Park, K. S. Park, S. Y. Park,O. G. Polischuk,H. Prihtiadi,S. Ra,S. S. Ratkevich,G. Rooh,M. B. Sari, J. Seo,K. M. Seo, B. Sharma,K. A. Shin, V. N. Shlegel, K. Siyeon, J. So,N. V. Sokur, J. K. Son, J. W. Song,N. Srisittipokakun, V. I. Tretyak,R. Wirawan,K. R. Woo,H. J. Yeon, Y. S. Yoon, Q. Yue

arxiv(2024)

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Abstract
The AMoRE collaboration searches for neutrinoless double beta decay of ^100Mo 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 ^100Mo 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 ^208Tl 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 ^6Li(n, α)^3H 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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