Study of the neutrino-oxygen cross sections of the charged-current reaction 16O(ν̅e, e+) 16N(0 MeV, 2−) and the neutral-current reaction 16O(ν, ν′)16O(12.97/12.53 MeV, 2−), producing high-energy γ rays

In the previous work, we discussed the cross section and the detection of 4.4-MeV γ rays produced in the neutrino neutral-current (NC) reaction 16O(ν, ν′)16O(12.97 MeV and 12.53 MeV, 2−) in a water Cherenkov detector at the low energy below 100 MeV. In this report, we further investigated both the charged-current (CC) reaction 16O($\bar{\nu }_e, e^+)^{16}$N(0 MeV, 2−) and the NC reaction16O(ν, ν′)16O(12.97 MeV and 12.53 MeV, 2−), producing high-energy γ rays, in which the more solid identification of the reactions can be applied via the coincidence method.