Differential cross sections ${}^4$He({$\gamma$,p})${}^3$H and ${}^4$He({$\gamma$,n})${}^3$He reactions in the range of the photon energies up to the threshold of the meson production

Abstract

Differential cross sections two-body ($\gamma ,p$) and ($\gamma ,n$) reactions of the ${}^4$He nucleus disintegration were measured using the bremsstrahlung beam of photons at the KIPT linac LEA-300 at the maximum energy ${\mathrm{E}}_{\gamma }^{max}$ = 150 MeV. The reaction products were detected in a diffusion chamber placed in the magnetic field. The differential cross sections were measured with a 1 MeV step up to a photon energy of 45 MeV, and with a greater step at higher energies. The step in the measurements of the polar angle of nucleon emission was ${10}^{\circ }$ in the c.m.s.