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Search for two-neutrino double electron capture on 124Xe with the XMASS-I detector
oleh: K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, T. Norita, H. Ogawa, H. Sekiya, O. Takachio, A. Takeda, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, S. Tasaka, J. Liu, K. Martens, Y. Suzuki, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Onishi, Y. Takeuchi, Y.H. Kim, J.S. Lee, K.B. Lee, M.K. Lee, Y. Fukuda, Y. Itow, R. Kegasa, K. Kobayashi, K. Masuda, H. Takiya, H. Uchida, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura
Format: | Article |
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Diterbitkan: | Elsevier 2016-08-01 |
Deskripsi
Double electron capture is a rare nuclear decay process in which two orbital electrons are captured simultaneously in the same nucleus. Measurement of its two-neutrino mode would provide a new reference for the calculation of nuclear matrix elements whereas observation of its neutrinoless mode would demonstrate lepton number violation. A search for two-neutrino double electron capture on 124Xe is performed using 165.9 days of data collected with the XMASS-I liquid xenon detector. No significant excess above background was observed and we set a lower limit on the half-life as 4.7×1021 years at 90% confidence level. The obtained limit has ruled out parts of some theoretical expectations. We obtain a lower limit on the 126Xe two-neutrino double electron capture half-life of 4.3×1021 years at 90% confidence level as well.