The reactions
F19
(
d,
p)F
20* and
F19
(
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
cm=54° and θ
cm=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
F19
(
d,
p)F
20 at θ
cm=104° shows a broad maximum centered at about 1.70 Mev deuteron energy, on the other hand that from the
F19
(
d,
p)F
20* reaction at θ
cm=54° shows a slow increase with increasing deuteron energy. These results at our bombarding energies show that the reaction
F19
(
d,
p)F
20 seems to proceed mostly by compound nucleus formation and the reaction
F19
(
d,
p)F
20* (0.65 Mev) seems to be caused by the stripping process of
d neutrons.
抄録全体を表示