(γ, π0γ) reaction on a nucleus in the GeV region

π⁰γ invariant mass distribution spectrum has been calculated for the (γ, π⁰γ) reaction on¹²C nucleus at 2.5 GeV beam energy. These π⁰ and γ are assumed to originate due to the decay of vector mesons produced in the photonuclear reaction. The nuclear medium effect on vector mesons and the effect of π⁰ rescattering on the π⁰γ invariant mass spectrum have been investigated