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Title: Precision Analysis of the Xe 136 Two-Neutrino β β Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements

Abstract

In this paper, we present a precision measurement of the $$^{136}$$Xe two-neutrino $$\beta\beta$$ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino $$\beta\beta$$ rate allows us to measure the ratio of the leading and subleading $$2\nu\beta\beta$$ nuclear matrix elements (NMEs), $$\xi^{2\nu}_{31} = -0.26^{+0.31}_{-0.25}$$. Theoretical predictions from the nuclear shell model and the majority of the quasiparticle random-phase approximation (QRPA) calculations are consistent with the experimental limit. However, part of the $$\xi^{2\nu}_{31}$$ range allowed by the QRPA is excluded by the present measurement at the 90%25 C.L. Our analysis reveals that predicted $$\xi^{2\nu}_{31}$$ values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Since these aspects are also at play in neutrinoless $$\beta\beta$$ decay, $$\xi^{2\nu}_{31}$$ provides new insights towards reliable neutrinoless $$\beta\beta$$ NMEs.

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:
1512334
Alternate Identifier(s):
OSTI ID: 1506403
Grant/Contract Number:  
[AC02-05CH11231; FG02-00ER41132]
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
[Journal Name: Physical Review Letters Journal Volume: 122 Journal Issue: 19]; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Gando, A., Gando, Y., Hachiya, T., Ha Minh, M., Hayashida, S., Honda, Y., Hosokawa, K., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kamizawa, K., Kinoshita, T., Koga, M., Matsuda, S., Mitsui, T., Nakamura, K., Ono, A., Ota, N., Otsuka, S., Ozaki, H., Shibukawa, Y., Shimizu, I., Shirahata, Y., Shirai, J., Sato, T., Soma, K., Suzuki, A., Takeuchi, A., Tamae, K., Ueshima, K., Watanabe, H., Chernyak, D., Kozlov, A., Obara, S., Yoshida, S., Takemoto, Y., Umehara, S., Fushimi, K., Hirata, S., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., O’Donnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Menéndez, J., Dvornický, R., Šimkovic, F., and KamLAND-Zen Collaboration. Precision Analysis of the Xe 136 Two-Neutrino β β Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.192501.
Gando, A., Gando, Y., Hachiya, T., Ha Minh, M., Hayashida, S., Honda, Y., Hosokawa, K., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kamizawa, K., Kinoshita, T., Koga, M., Matsuda, S., Mitsui, T., Nakamura, K., Ono, A., Ota, N., Otsuka, S., Ozaki, H., Shibukawa, Y., Shimizu, I., Shirahata, Y., Shirai, J., Sato, T., Soma, K., Suzuki, A., Takeuchi, A., Tamae, K., Ueshima, K., Watanabe, H., Chernyak, D., Kozlov, A., Obara, S., Yoshida, S., Takemoto, Y., Umehara, S., Fushimi, K., Hirata, S., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., O’Donnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Menéndez, J., Dvornický, R., Šimkovic, F., & KamLAND-Zen Collaboration. Precision Analysis of the Xe 136 Two-Neutrino β β Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements. United States. doi:10.1103/PhysRevLett.122.192501.
Gando, A., Gando, Y., Hachiya, T., Ha Minh, M., Hayashida, S., Honda, Y., Hosokawa, K., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kamizawa, K., Kinoshita, T., Koga, M., Matsuda, S., Mitsui, T., Nakamura, K., Ono, A., Ota, N., Otsuka, S., Ozaki, H., Shibukawa, Y., Shimizu, I., Shirahata, Y., Shirai, J., Sato, T., Soma, K., Suzuki, A., Takeuchi, A., Tamae, K., Ueshima, K., Watanabe, H., Chernyak, D., Kozlov, A., Obara, S., Yoshida, S., Takemoto, Y., Umehara, S., Fushimi, K., Hirata, S., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., O’Donnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Menéndez, J., Dvornický, R., Šimkovic, F., and KamLAND-Zen Collaboration. Mon . "Precision Analysis of the Xe 136 Two-Neutrino β β Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements". United States. doi:10.1103/PhysRevLett.122.192501.
@article{osti_1512334,
title = {Precision Analysis of the Xe 136 Two-Neutrino β β Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements},
author = {Gando, A. and Gando, Y. and Hachiya, T. and Ha Minh, M. and Hayashida, S. and Honda, Y. and Hosokawa, K. and Ikeda, H. and Inoue, K. and Ishidoshiro, K. and Kamei, Y. and Kamizawa, K. and Kinoshita, T. and Koga, M. and Matsuda, S. and Mitsui, T. and Nakamura, K. and Ono, A. and Ota, N. and Otsuka, S. and Ozaki, H. and Shibukawa, Y. and Shimizu, I. and Shirahata, Y. and Shirai, J. and Sato, T. and Soma, K. and Suzuki, A. and Takeuchi, A. and Tamae, K. and Ueshima, K. and Watanabe, H. and Chernyak, D. and Kozlov, A. and Obara, S. and Yoshida, S. and Takemoto, Y. and Umehara, S. and Fushimi, K. and Hirata, S. and Berger, B. E. and Fujikawa, B. K. and Learned, J. G. and Maricic, J. and Winslow, L. A. and Efremenko, Y. and Karwowski, H. J. and Markoff, D. M. and Tornow, W. and O’Donnell, T. and Detwiler, J. A. and Enomoto, S. and Decowski, M. P. and Menéndez, J. and Dvornický, R. and Šimkovic, F. and KamLAND-Zen Collaboration},
abstractNote = {In this paper, we present a precision measurement of the $^{136}$Xe two-neutrino $\beta\beta$ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino $\beta\beta$ rate allows us to measure the ratio of the leading and subleading $2\nu\beta\beta$ nuclear matrix elements (NMEs), $\xi^{2\nu}_{31} = -0.26^{+0.31}_{-0.25}$. Theoretical predictions from the nuclear shell model and the majority of the quasiparticle random-phase approximation (QRPA) calculations are consistent with the experimental limit. However, part of the $\xi^{2\nu}_{31}$ range allowed by the QRPA is excluded by the present measurement at the 90%25 C.L. Our analysis reveals that predicted $\xi^{2\nu}_{31}$ values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Since these aspects are also at play in neutrinoless $\beta\beta$ decay, $\xi^{2\nu}_{31}$ provides new insights towards reliable neutrinoless $\beta\beta$ NMEs.},
doi = {10.1103/PhysRevLett.122.192501},
journal = {Physical Review Letters},
number = [19],
volume = [122],
place = {United States},
year = {2019},
month = {5}
}

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DOI: 10.1103/PhysRevLett.122.192501

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