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Title: Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen

Abstract

Here, we present an improved search for neutrinoless double-beta (0νββ) decay of Xe 136 in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the Ag 110m contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the 0νββ decay half-life of T$$0v\atop{1/2}$$ > 1.07×10 26 yr at 90% C.L., an almost sixfold improvement over previous limits. Using commonly adopted nuclear matrix element calculations, the corresponding upper limits on the effective Majorana neutrino mass are in the range 61-165 meV. Finally, for the most optimistic nuclear matrix elements, this limit reaches the bottom of the quasidegenerate neutrino mass region.

Authors:
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Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
KamLAND-Zen Collaboration
OSTI Identifier:
1379566
Alternate Identifier(s):
OSTI ID: 1295992
Grant/Contract Number:
AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 117; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Gando, A., Gando, Y., Hachiya, T., Hayashi, A., Hayashida, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Karino, Y., Koga, M., Matsuda, S., Mitsui, T., Nakamura, K., Obara, S., Oura, T., Ozaki, H., Shimizu, I., Shirahata, Y., Shirai, J., Suzuki, A., Takai, T., Tamae, K., Teraoka, Y., Ueshima, K., Watanabe, H., Kozlov, A., Takemoto, Y., Yoshida, S., Fushimi, K., Banks, T. I., Berger, B. E., Fujikawa, B. K., O’Donnell, T., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Detwiler, J. A., Enomoto, S., and Decowski, M. P. Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.117.082503.
Gando, A., Gando, Y., Hachiya, T., Hayashi, A., Hayashida, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Karino, Y., Koga, M., Matsuda, S., Mitsui, T., Nakamura, K., Obara, S., Oura, T., Ozaki, H., Shimizu, I., Shirahata, Y., Shirai, J., Suzuki, A., Takai, T., Tamae, K., Teraoka, Y., Ueshima, K., Watanabe, H., Kozlov, A., Takemoto, Y., Yoshida, S., Fushimi, K., Banks, T. I., Berger, B. E., Fujikawa, B. K., O’Donnell, T., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Detwiler, J. A., Enomoto, S., & Decowski, M. P. Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen. United States. doi:10.1103/PhysRevLett.117.082503.
Gando, A., Gando, Y., Hachiya, T., Hayashi, A., Hayashida, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Karino, Y., Koga, M., Matsuda, S., Mitsui, T., Nakamura, K., Obara, S., Oura, T., Ozaki, H., Shimizu, I., Shirahata, Y., Shirai, J., Suzuki, A., Takai, T., Tamae, K., Teraoka, Y., Ueshima, K., Watanabe, H., Kozlov, A., Takemoto, Y., Yoshida, S., Fushimi, K., Banks, T. I., Berger, B. E., Fujikawa, B. K., O’Donnell, T., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Detwiler, J. A., Enomoto, S., and Decowski, M. P. Tue . "Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen". United States. doi:10.1103/PhysRevLett.117.082503. https://www.osti.gov/servlets/purl/1379566.
@article{osti_1379566,
title = {Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen},
author = {Gando, A. and Gando, Y. and Hachiya, T. and Hayashi, A. and Hayashida, S. and Ikeda, H. and Inoue, K. and Ishidoshiro, K. and Karino, Y. and Koga, M. and Matsuda, S. and Mitsui, T. and Nakamura, K. and Obara, S. and Oura, T. and Ozaki, H. and Shimizu, I. and Shirahata, Y. and Shirai, J. and Suzuki, A. and Takai, T. and Tamae, K. and Teraoka, Y. and Ueshima, K. and Watanabe, H. and Kozlov, A. and Takemoto, Y. and Yoshida, S. and Fushimi, K. and Banks, T. I. and Berger, B. E. and Fujikawa, B. K. and O’Donnell, T. and Winslow, L. A. and Efremenko, Y. and Karwowski, H. J. and Markoff, D. M. and Tornow, W. and Detwiler, J. A. and Enomoto, S. and Decowski, M. P.},
abstractNote = {Here, we present an improved search for neutrinoless double-beta (0νββ) decay of Xe136 in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the Ag110m contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the 0νββ decay half-life of T$0v\atop{1/2}$ > 1.07×1026 yr at 90% C.L., an almost sixfold improvement over previous limits. Using commonly adopted nuclear matrix element calculations, the corresponding upper limits on the effective Majorana neutrino mass are in the range 61-165 meV. Finally, for the most optimistic nuclear matrix elements, this limit reaches the bottom of the quasidegenerate neutrino mass region.},
doi = {10.1103/PhysRevLett.117.082503},
journal = {Physical Review Letters},
number = 8,
volume = 117,
place = {United States},
year = {Tue Aug 16 00:00:00 EDT 2016},
month = {Tue Aug 16 00:00:00 EDT 2016}
}

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