Conclusion and Prospects

This thesis measured electron antineutrinos, \(\bar{\nu }_{e}\) , of 4.3– \(17.3\,{\text {MeV}}\) region in neutrino energy with the Super-Kamiokande Gd detector. The detail \(\bar{\nu }_{e}\) flux measurement from 4.3– \(9.3\,{\text {MeV}}\) is a new energy region in the SK experiment. The total exposure in this analysis covers \(536.6\,{\text {days}}\) of the first Gd loaded phase, where Gd mass concentration was \(0.01\,\%\) , and corresponds to \(33.1\,{\text {kt}}\,{\text {year}}\) . This thesis is composed of two dedicated analyses focusing on reactor neutrinos and astrophysical flux.