Speaker
Description
Observation of Diffuse Supernova-Neutrino Background (DSNB) gives us a new insight into star formation history. The SuperKamiokande (SK) experiment aims to make the first discovery of this flux.
Since 2020, the SK detector has been updated by loading gadolinium (Gd) as a new experimental phase, ‘SK-Gd.’
In the SK-Gd experiment, event selection with delayed coincidence using neutron capture signal, such as inverse beta decay of electron antineutrinos, is improved thanks to high cross-section and high energy gamma-ray emission of thermal neutron capture on Gd.
In July 2022, the observation with 0.01% Gd mass concentration was completed, and currently, an updated phase with 0.03% mass concentration is in operation.
We report the result of a search for the DSNB flux in SK-Gd with a 22.5×956 kton×day exposure. Finally, prospects for the DSNB search in SK-Gd are discussed.
| Collaboration(s) | The Super-Kamiokande Collaboration |
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