Study of the neutrino-oxygen cross sections of the charged-current reaction 16O(ν̄ₑ,e⁺)16N(0 MeV,2⁻) and the neutral-current reaction 16O(ν,ν')16O(12.97/12.53 MeV,2⁻), producing high-energy gamma 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(νₑ, e⁺)¹⁶N(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.