Speaker
Description
Super-Kamiokande is a large underground water Cherenkov detector for neutrino physics and nucleon decay search in Kamioka, Japan. We upgraded its detector with gadolinium (Gd) in 2020 (SK-Gd) to improve electron antineutrino ($\bar{\nu}_{\text{e}}$) identification. The higher energy yield from neutron capture of Gd enables the SK trigger system to apply to a lower energy region in $\bar{\nu}_{\text{e}}$ search than that in the pure water phase where the previous search had a 9 MeV energy threshold.
Many scintillator experiments have measured reactor antineutrinos well, especially in the KamLAND detector in the long baseline over 100 km. No large-scale water Cherenkov detector succeeded in the long-baseline measurements except for the evidence in the SNO+ experiment.
We conducted electron antineutrino analysis from 4 MeV $\bar{\nu}_{\text{e}}$ energy threshold via inverse beta decay in the first Gd phase (0.01% concentration), $536 \times 22.5~\text{days} \cdot \text{kt}$ exposure from 2020 summer to 2022 summer, and observed reactor neutrino. In this poster, we will show the result of reactor neutrino analysis in the first Gd phase (0.01%) and its status in the second Gd phase (0.03%). In addition, we will discuss the application of reactor neutrino measurement in SK-Gd.
| Poster prize | Yes |
|---|---|
| Given name | Shota |
| Surname | Izumiyama |
| First affiliation | Tokyo Institute of Technology |
| Institutional email | izumiyama@hep.phys.titech.ac.jp |
| Gender | Male |
| Collaboration (if any) | Super-Kamiokande Collaboration |
