Compound-statistical features of deuteron-induced reactions: (II). The compound nucleus and stripping-evaporation mechanisms in (d, 2n) reactions

Abstract

Six excitation functions for (d, 2n) reactions on 65Cu, 126Te, 128Te, 130Te, 133Cs and 186W have been measured radiochemically between ≈ 4 and 15 MeV. The excitation functions exhibit sharp rises above threshold and peak near the (d, 3n) thresholds at values approaching the cross sections for compound nucleus formation. The present results are included with previous data in a theoretical analysis covering the mass region above A = 47. Calculations of the excitation functions have been performed for two different mechanisms; compound nucleus formation followed by the evaporation of two neutrons and (d, n) stripping followed by the evaporation of one neutron. The compound-statistical model generally accounts very well for both the magnitudes and the energy dependences of the cross sections. The predictions of the stripping-evaporation mechanism are 15–30% of the observed cross sections. It is concluded that the compound nuclear mechanism predominates in (d, 2n) reactions above A = 47.