Abe, K, Bronner, C, Hayato, Y, Hiraide, K, Ikeda, M, Imaizumi, S, Kameda, J, Kanemura, Y, Kataoka, Y, Miki, S et al (show 210 more authors)
(2021)
Diffuse supernova neutrino background search at Super-Kamiokande.
Physical Review D, 104 (12).
122002-.
ISSN 2470-0010, 2470-0029
Text
2109.11174.pdf - Author Accepted Manuscript Download (5MB) | Preview |
Abstract
We have conducted a new search for the diffuse supernova neutrino background (DSNB) flux at Super-Kamiokande (SK), with a 22.5×2970-kton·day exposure from its fourth operational phase IV. With the new analysis we improve on the existing background reduction techniques and systematic uncertainties and take advantage of an improved neutron tagging algorithm to lower the energy threshold compared to the previous phases of SK. This allows for setting the world's most stringent upper limit on the extraterrestrial ν¯e flux, for neutrino energies below 31.3 MeV. The SK-IV results are combined with the ones from the first three phases of SK to perform a joint analysis using 22.5×5823 kton·days of data. This analysis has the world's best sensitivity to the DSNB ν¯e flux, comparable to the predictions from various models. For neutrino energies larger than 17.3 MeV, the new combined 90% CL upper limits on the DSNB ν¯e flux lie around 2.7 cm-2·sec-1, strongly disfavoring the most optimistic predictions. Finally, potentialities of the gadolinium phase of SK and the future Hyper-Kamiokande experiment are discussed.
Item Type: | Article |
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Uncontrolled Keywords: | 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences |
Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
Depositing User: | Symplectic Admin |
Date Deposited: | 24 Jan 2022 08:50 |
Last Modified: | 07 Dec 2024 22:14 |
DOI: | 10.1103/physrevd.104.122002 |
Related URLs: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3147516 |