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

TL;DR

This study measures the differential cross sections of helium-4 photodisintegration into proton and neutron channels up to 150 MeV photon energy, providing detailed angular distributions and insights into nuclear reaction mechanisms.

Contribution

It presents new experimental data on differential cross sections for $^4$He($b0,b7$) reactions at energies up to 150 MeV, extending previous measurements and improving angular resolution.

Findings

Differential cross sections measured up to 45 MeV with 1 MeV steps.

Angular distributions obtained with 10° step in the center-of-mass system.

Data contribute to understanding of nuclear response to high-energy photons.

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 ${\rm E}_{\gamma}^{max}$ = 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.