Angular distributions of quasi-free scattering contributions in deuteron break-up by protons and deuterons

Abstract

Proton-proton and proton-neutron coincidence spectra from the p + d → p + P + n reaction were measured simultaneously for E_p = 12.5 MeV and θ = θ₁ = −θ₂ in the interval $\text{15°}\text{+}\text{̌}\text{= θ ≦ 60°.}$ Deuteron-proton and deuteron-neutron coincidence spectra from the d + d → d + p + n reaction were measured also for E_d = 12.5 MeV and θ = θ₁ = −θ₂ in the interval 15° ≦ θ ≦ 40°. Measured spectra are discussed in terms of the quasi-free scattering model. The shape of measured spectra and the angular dependence of the peak cross sections are fairly well reproduced. It was found that the ratio of the peak cross section for n-p and p-p quasi-free scattering in the p + d → p + p + n reaction varied from 1.3 at θ = 15° to 4.3 at θ = 42.5°. The ratio of the peak cross section for n-d and p-d quasi-free scattering in the d + d → d + p + n reaction was found to be constant and close to one. The variation of the $\text{σ}{}_{\mathrm{np}}\text{σ}{}_{\mathrm{pp}}$ peak ratio in the p + d → p + p + n reaction can be attributed to the influence of n-p and p-p final-state interactions.