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arXiv · 2607.08039

A study of neutrinoless double electron capture in $^{40}$Ca from the AMoRE experiment

AMoRE Collaboration·A. Agrawal·V. V. Alenkov·P. Aryal·J. Beyer·B. Bhandari·R. S. Boiko·K. Boonin·O. Buzanov·C. R. Byeon·N. Chanthima·M. K. Cheoun·J. S. Choe·Seonho 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·Ho-Jong 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·DongYeup 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. B. 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·E. Sala·M. B. Sari·J. Seo·K. M. Seo·B. Sharma·K. A. Shin·V. N. Shlegel·K. Siyeon·J. So
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Abstract

The search for neutrinoless double electron capture ($0\nu\mathrm{2EC}$) provides a sensitive probe of lepton-number violation and the Majorana nature of neutrinos. We investigate the $0\nu\mathrm{2EC}$ decay of $^{40}$Ca using cryogenic detectors equipped with metallic magnetic calorimeters in the AMoRE-I experiment. The analysis is based on a physics dataset corresponding to a total exposure of 7.32 kg$\cdot$yr from thirteen $^{40}$Ca$^{100}$MoO$_4$ crystals. No significant excess is observed, and a lower limit on the half-life is obtained as $T^{0\nu}_{1/2} > 1.7 \times 10^{22}$ yr at 90$\%$ confidence level. An improved sensitivity is expected for the upcoming AMoRE-II experiment. These results demonstrate the potential of CaMoO$_4$ detectors to explore rare decay processes beyond the primary $^{100}$Mo $0\nu\beta\beta$ search program.

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AMoRE Collaboration, A. Agrawal, V. V. Alenkov, P. Aryal, J. Beyer, B. Bhandari, R. S. Boiko, K. Boonin, O. Buzanov, C. R. Byeon, N. Chanthima, M. K. Cheoun, J. S. Choe, Seonho 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, Ho-Jong 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, DongYeup 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. B. 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, E. Sala, M. B. Sari, J. Seo, K. M. Seo, B. Sharma, K. A. Shin, V. N. Shlegel, K. Siyeon, J. So. 2026-07-09. A study of neutrinoless double electron capture in $^{40}$Ca from the AMoRE experiment. https://arxiv.org/abs/2607.08039

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