# 17th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2021)

26 August 2021 to 3 September 2021

## Seach for supernova relic neutrinos at KamLAND

30 Aug 2021, 17:10
50m
Talk in parallel session Neutrino physics and astrophysics

### Speaker

Shuhei Obara (Tohoku University)

### Description

We report a search for electron antineutrinos at KamLAND with an energy range of 8.3--30.8 MeV via the inverse beta decay.
In 4528 days of KamLAND data, we found 18 event candidates and no significant excess over estimated backgrounds.
From data interpretation, with the assumption of some supernova relic neutrino spectrum predictions, we give upper flux limits of $60$--$110\,{\mathrm{cm}^{-2}\mathrm{s}^{-1}}$ ($90\%$ CL) in the analysis range and present a model-independent flux.
These upper limits are the most stringent for 8.3--12 MeV region to date.
We also improve on the upper probability limit of $^8$B solar neutrinos converting into antineutrinos via the Resonant Spin Flavor Precession with the neutrino magnetic moment.
Besides, we could set limits on the annihilation cross section for light dark matter pairs to neutrino pairs.

### Primary author

Shuhei Obara (Tohoku University)

### Presentation Materials

 presentation20210830_SRN_TAUP2021.pdf Reference to paper Youtube link, Search for Supernova Relic Neutrinos at KamLAND | Obara, S. | TAUP2021
###### Your browser is out of date!

Update your browser to view this website correctly. Update my browser now

×