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

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