The γ‐ray production in neutral‐current neutrino‐oxygen interaction in the energy range above 100 MeV

We calculate the cross section of the γ‐ray production from neutral‐current neutrino‐oxygen quasi‐elasticinteraction, ν+16O→ν+p+15N*, or ν+16O→ν+n+15O*, in which the residual nuclei (15N* or 15O*) lead to the γ‐ray emission with Eγ>6 MeV at thebranching ratio of 41%. Above 200 MeV, this cross section dominates over that of γ‐ray production from the inelastic reaction, ν+16O→+16O*. In the present calculation, spectral function and the spectroscopic factors of 1p1/2, 1p3/2 and 1s1/2 states areessential. The γ‐ray production is dominated by the deexcitation of 1p3/2 state of the residual nucleus.