Differential cross sections in the 12C+γ → p+n+10B reaction

Differential cross sections in c. m. s. of the products of the 12C+γ→p+n+10B reaction in the energy intervals 34-40, 40-50, 50-60, 60-75, 75-100, 100-150 MeV are measured by means of a diffusion chamber in a magnetic field exposed to the bremsstrahlung gamma quanta. 2936 events have been processed. The error of proton angle measurement does not exceed 2 deg. The error of outlet angle measurement of residual nucleus has been, determined by multiple scattering and reached 8 deg. Angular distributions of products in the reaction centre system are shown. At energies up to 40 MeV angular distributions are isotropic for all particles. With energy increase the distributions become anisotropic and anisotropy grows with energy increase. Angular distributions of all products become asymmetrical in relation to 90 deg. Maximum of nucleon angular distributions is shifted in thesmoll angles direction. To comepare experimental results with the quasideuteron model predictions differential cross sections depending on proton angle in the np-pair and γ-quantum rest system are obtained. The results confirm qualitatively the validity of the quasi-deuteron model in the intermediate energy range