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 γ Rays

In our 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 and 12.53 MeV, 2⁻) in a water Cherenkov detector at low energy below 100 MeV. In this report, we further investigate both the charged-current reaction ¹⁶O(ν ̄ₑ, e⁺)¹⁶N(0 MeV, 2⁻) and the NC reaction¹⁶O(ν , ν )¹⁶O(12.97 and 12.53 MeV, 2⁻), producing high-energy γ rays, in which a more solid identification of the reactions can be applied via the coincidence method.