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Diffuse supernova neutrino background search at Super-Kamiokande
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Super-Kamiokande Collaboration (Including:
). (2021) Diffuse supernova neutrino background search at Super-Kamiokande. Physical Review D (Particles, Fields, Gravitation and Cosmology), 104 (12). 122002 . doi:10.1103/PhysRevD.104.122002 ISSN 1550-7998.Research output not available from this repository.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.104.122002
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 νe 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 ¯νe 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 ¯νe 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: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Physical Review D (Particles, Fields, Gravitation and Cosmology) | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 1550-7998 | ||||||
| Official Date: | 10 December 2021 | ||||||
| Dates: |
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| Volume: | 104 | ||||||
| Number: | 12 | ||||||
| Article Number: | 122002 | ||||||
| DOI: | 10.1103/PhysRevD.104.122002 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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