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Precise knowledge of neutrino neutral current elastic interaction on oxygen is important to im- prove the sensitivity in search for supernova relic neutrinos at Super-Kamiokande. While the measurement of the interaction cross section is successfully conducted at the T2K experiment us- ing as signal gamma-rays emitted from excited nuclei, a large systematic error remains since the current model, which is used for the predictions of gamma-ray emission through nuclear reactions following the primary neutrino interaction, is not optimal. To reduce the systematic uncertainty, the measurement of gamma-ray production from neutron-oxygen reactions is carried out using an 80 MeV quasi-mono energetic neutron beam. In the experiment, several gamma-ray peaks from the reactions of oxygen nuclei with fast neutrons are observed. In addition, neutron flux and background measurements are also conducted for the cross section estimation. Using the data, the production cross section of 6.13 MeV gamma-ray, which is important in the T2K measurement, is estimated. Finally, future prospects are also reported.

Measurement of gamma-ray emission from neutron-$^{16}$O reactions with an 80 MeV quasi-mono energetic neutron beam