Limits on Astrophysical Antineutrinos with the KamLAND Experiment
We report on a search for electron antineutrinos (${\bar{\nu }}_{e}$) 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. Altho...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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American Astronomical Society
2022
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| Online Access: | https://hdl.handle.net/1721.1/142354 |
| _version_ | 1811071131533180928 |
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| author | Axani, Spencer Nicholas Winslow, Lindley Fu, Z. Ouellet, Jonathan L |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Axani, Spencer Nicholas Winslow, Lindley Fu, Z. Ouellet, Jonathan L |
| author_sort | Axani, Spencer Nicholas |
| collection | MIT |
| description | We report on a search for electron antineutrinos (${\bar{\nu }}_{e}$) 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. |
| first_indexed | 2024-09-23T08:46:31Z |
| format | Article |
| id | mit-1721.1/142354 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:46:31Z |
| publishDate | 2022 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1423542023-02-09T19:44:42Z Limits on Astrophysical Antineutrinos with the KamLAND Experiment Axani, Spencer Nicholas Winslow, Lindley Fu, Z. Ouellet, Jonathan L Massachusetts Institute of Technology. Department of Physics We report on a search for electron antineutrinos (${\bar{\nu }}_{e}$) 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. 2022-05-05T14:13:07Z 2022-05-05T14:13:07Z 2022-01-01 2022-05-05T14:09:18Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/142354 Winslow, Lindley. 2022. "Limits on Astrophysical Antineutrinos with the KamLAND Experiment." The Astrophysical Journal, 925 (1). en 10.3847/1538-4357/ac32c1 The Astrophysical Journal Creative Commons Attribution 4.0 International License https://creativecommons.org/licenses/by/4.0 application/pdf American Astronomical Society American Astronomical Society |
| spellingShingle | Axani, Spencer Nicholas Winslow, Lindley Fu, Z. Ouellet, Jonathan L Limits on Astrophysical Antineutrinos with the KamLAND Experiment |
| title | Limits on Astrophysical Antineutrinos with the KamLAND Experiment |
| title_full | Limits on Astrophysical Antineutrinos with the KamLAND Experiment |
| title_fullStr | Limits on Astrophysical Antineutrinos with the KamLAND Experiment |
| title_full_unstemmed | Limits on Astrophysical Antineutrinos with the KamLAND Experiment |
| title_short | Limits on Astrophysical Antineutrinos with the KamLAND Experiment |
| title_sort | limits on astrophysical antineutrinos with the kamland experiment |
| url | https://hdl.handle.net/1721.1/142354 |
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