Yields and Angular Distributions of Protons from F19(d, p)F20 and F19(d, p)F20*

Abstract

The reactions F 19 ( d , p )F 20 and F 19 ( d , p ) 20* have been studied with deuteron bombarding energy of 1.3 Mev to 2.0 Mev. Angular distributions of protons leaving F 20 in 0.65 Mev excited state show a pronounced peak at about 60° over the entire deuteron energy range. On the other hand, those leaving F 20 in the ground state vary with the deuteron bombarding energy and most of them show no peak in the forward direction and a large peak in the backward direction. The absolute yields of the reactions have been measured at θ c m = 54° and θ c m = 104° as functions of the bombarding energy. A marked difference in the energy dependence of the yields for the two reactions is noted. The yield for the reaction F 19 ( d , p )F 20 at θ c m = 104° shows a broad maximum centered at about 1.70 Mev deuteron energy, on the other hand that from the F 19 ( d , p )F 20* reaction at θ c m = 54° shows a slow increase with increasing deuteron energy. These results at our bombarding energies show that the reaction F 19 ( d , p )F 20 seems to proceed mostly by compound nucleus formation and the reaction F 19 ( d , p )F 20* (0.65 Mev) seems to be caused by the stripping process of d neutrons.