Neutrons and γ-rays following 60 MeV proton bombardment of 165Ho were measured in coincidence with discrete γ-rays characteristic of the reaction channels (residual nuclei). The cross sections for the (p, xcnγ) reactions with x = 2-6, the γ-ray multiplicities, and the energy and angular distributions of the emitted neutrons were analyzed in terms of the preequilibrium and equilibrium deexcitation processes. Characteristic behaviours of the preequilibrium process were found in the (p, 2nγ) and (p, 4nγ) reactions where the sum ET, = ∑xEi of the energies Ei of the emitted neutrons was large, while those of the equilibrium process were typical for the (p, 6ny) reaction with small ET. The reactions are well reproduced by the expression σ. ≈0.35∑xσ (2, x-2) + 0.4∑xσ(1, χ-1)+ 0.25∑xσ(0, x), where σ(np, nc) stands for emission of np neutrons at the preequilibrium stage followed by evaporation of nc neutrons at the equilibrium stage.
- Nuclear reactions
ASJC Scopus subject areas
- Nuclear and High Energy Physics