Investigation of theC12(γ,pn)Reaction Using Tagged Photons

Abstract

Tagged-photon measurements of the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}(\gamma ,pn)$ reaction in the photon energy range 83-133 MeV are reported. The measurements have achieved a good angular resolution, ≃4°, and a better missing-energy resolution, ≃8 MeV, than any previous measurement. This has allowed events to be selected in which both the neutron and proton are ejected from the $1p$ shell of the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ nucleus. The correlation of the momenta of the outgoing nucleon pairs is quantitatively explained by the quasideuteron mechanism.