Limits on astrophysical antineutrinos with the KamLAND Experiment

Abe, S.; Asami, S.; Gando, A.; Gando, Y.; Gima, T.; Goto, A.; Hachiya, T.; Hata, K.; Hayashida, S.; Hosokawa, K.; Ichimura, K.; Ieki, S.; Ikeda, H.; Inoue, K.; Ishidoshiro, K.; Kamei, Y.; Kawada, N.; Kishimoto, Y.; Kinoshita, T.; Koga, M.; Maemura, N.; Mitsui, T.; Miyake, H.; Nakamura, K.; Nakamura, R.; Ozaki, H.; Sakai, T.; Sambonsugi, H.; Shimizu, I.; Shirahata, Y.; Shirai, J.; Shiraishi, K.; Suzuki, A.; Suzuki, Y.; Takeuchi, A.; Tamae, K.; Ueshima, K.; Wada, Y.; Watanabe, H.; Yoshida, Y.; Obara, S.; Ichikawa, A.K.; Kozlov, A.; Chernyak, D.; Takemoto, Y.; Yoshida, S.; Umehara, S.; Fushimi, K.; Hirata, S.; Nakamura, K.Z.; Yoshida, M.; Berger, B.E.; Fujikawa, B.K.; Learned, J.G.; Maricic, J.; Axani, S.N.; Winslow, L.A.; Fu, Z.; Ouellet, J.; Efremenko, Y.; Karwowski, H.J.; Markoff, D.M.; Tornow, W.; Li, A.; Detwiler, J.A.; Enomoto, S.; Decowski, M.P.; Grant, C.; O’Donnell, T.; Dell’Oro, S.

Limits on astrophysical antineutrinos with the KamLAND Experiment

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Abe_2022_ApJ_925_14.pdf(1.19 MB)

Published version

Date

2022-01-01

DOI

10.3847/1538-4357/ac32c1

Authors

Abe, S.

Asami, S.

Gando, A.

Gando, Y.

Gima, T.

Goto, A.

Hachiya, T.

Hata, K.

Hayashida, S.

Hosokawa, K.

URI

https://hdl.handle.net/2144/44320

Citation

S. Abe, S. Asami, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, S. Hayashida, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, T. Kinoshita, M. Koga, N. Maemura, T. Mitsui, H. Miyake, K. Nakamura, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, Y. Shirahata, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, K. Ueshima, Y. Wada, H. Watanabe, Y. Yoshida, S. Obara, A.K. Ichikawa, A. Kozlov, D. Chernyak, Y. Takemoto, S. Yoshida, S. Umehara, K. Fushimi, S. Hirata, K.Z. Nakamura, M. Yoshida, B.E. Berger, B.K. Fujikawa, J.G. Learned, J. Maricic, S.N. Axani, L.A. Winslow, Z. Fu, J. Ouellet, Y. Efremenko, H.J. Karwowski, D.M. Markoff, W. Tornow, A. Li, J.A. Detwiler, S. Enomoto, M.P. Decowski, C. Grant, T. O’Donnell, S. Dell’Oro. 2022. "Limits on Astrophysical Antineutrinos with the KamLAND Experiment." The Astrophysical Journal, Volume 925, Issue 1, pp. 14 - 14. https://doi.org/10.3847/1538-4357/ac32c1

Abstract

We report on a search for electron antineutrinos (n¯e) from astrophysical sources in the neutrino energy range 8.3–30.8 MeV with the KamLAND detector. In an exposure of 6.72 kton-year of the liquid scintillator, we observe 18 candidate events via the inverse beta decay reaction. Although there is a large background uncertainty from neutral current atmospheric neutrino interactions, we find no significant excess over background model predictions. Assuming several supernova relic neutrino spectra, we give upper flux limits of 60–110 cm−2 s −1 (90% confidence level, CL) in the analysis range and present a model-independent flux. We also set limits on the annihilation rates for light dark matter pairs to neutrino pairs. These data improve on the upper probability limit of 8B solar neutrinos converting into ${\bar{\nu }}_{e}$, ${P}_{{\nu }_{e}\to {\bar{\nu }}_{e}}\lt 3.5\times {10}^{-5}$ (90% CL) assuming an undistorted ${\bar{\nu }}_{e}$ shape. This corresponds to a solar ${\bar{\nu }}_{e}$ flux of 60 cm−2 s−1 (90% CL) in the analysis energy range.

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© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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