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Search for solar electron anti-neutrinos due to spin-flavor precession in the Sun with Super-Kamiokande-IV
- Source :
- Astroparticle Physics 139 (2022) 102702
- Publication Year :
- 2020
-
Abstract
- Due to a very low production rate of electron anti-neutrinos ($\bar{\nu}_e$) via nuclear fusion in the Sun, a flux of solar $\bar{\nu}_e$ is unexpected. An appearance of $\bar{\nu}_e$ in solar neutrino flux opens a new window for the new physics beyond the standard model. In particular, a spin-flavor precession process is expected to convert an electron neutrino into an electron anti-neutrino (${\nu_e\to\bar{\nu}_e}$) when neutrino has a finite magnetic moment. In this work, we have searched for solar $\bar{\nu}_e$ in the Super-Kamiokande experiment, using neutron tagging to identify their inverse beta decay signature. We identified 78 $\bar{\nu}_e$ candidates for neutrino energies of 9.3 to 17.3 MeV in 2970.1 live days with a fiducial volume of 22.5 kiloton water (183.0 kton$\cdot$year exposure). The energy spectrum has been consistent with background predictions and we thus derived a 90% confidence level upper limit of ${4.7\times10^{-4}}$ on the $\nu_e\to\bar{\nu}_e$ conversion probability in the Sun. We used this result to evaluate the sensitivity of future experiments, notably the Super-Kamiokande Gadolinium (SK-Gd) upgrade.<br />Comment: 16 pages, 10 figures, 7 tables
- Subjects :
- High Energy Physics - Experiment
Physics - Instrumentation and Detectors
Subjects
Details
- Database :
- arXiv
- Journal :
- Astroparticle Physics 139 (2022) 102702
- Publication Type :
- Report
- Accession number :
- edsarx.2012.03807
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.astropartphys.2022.102702