Excitation functions were measured by the stacked-foil technique for Ni64(p)61Co and Sr86(p)83Rb reactions from threshold up to 18.5 MeV. Thin samples of 95% enriched Ni64 were prepared by electrodeposition on gold foils, and those of 96.3% enriched SrCO386 via sedimentation on Cu backing. The radioactivity of the activation products was determined via high resolution -ray spectrometry. Statistical model calculations taking into account preequilibrium effects were performed for the experimentally measured competing reactions induced by protons on the target nuclei Ni64, Kr78, and Sr86. The strong (p,n) channel is described well by the calculation. In the case of weaker channels some discrepancies occurred between the experimental and theoretical data, in particular for Kr78 as target. Regarding the (p) process, an attempt was made to include direct three-nucleon pickup component. For the neutron deficient target nuclei Kr78 and Sr86 the direct reaction contribution to the (p) cross section appears to be small, presumably due to large (p,n) thresholds. Inclusion of this component in the (p) reaction on the neutron rich target nuclide Ni64, however, led to a better agreement between the experimental and theoretical data.
ASJC Scopus subject areas
- Nuclear and High Energy Physics