Kouya Ogino

Quasi-Free α-α Scattering in Be9 and C12 at 37 MeV

Energy and angular correlations between two alpha particles from the Be 9 (α, 2α)He 5 and C 12 (α, 2α)Be 8 reactions were investigated. The incident alpha particle energies were 32.3 MeV and 37.4 MeV for Be 9 and 37.4 MeV for C 12 . It is concluded that the quasi-free scattering of incident alpha particles from alpha clusters in Be 9 is the main process of the (α, 2α) reaction on Be 9 . It remains some ambiguity for the mechanism of the (α, 2α) reaction on C 12 to be explained as a simple quasi-free scattering process.

Alpha Emitting Reactions on Be9, B10and B11Induced by Protons, Deuterons and Alpha-Particles

The angular distributions have been obtained for alpha-particles from the reactions Be 9 ( p , α) Li 6 (ground state), Be 9 ( d , α) Li 7 (ground, first and second excited states), B 10 ( p , α) Be 7 (ground state), B 10 ( d , α) Be 8 (ground state), B 11 ( p , α) Be 8 (ground state) and B 11 ( d , α) Be 9 (ground and second excited states), and from the elastic and inelastic (second excited state) scatterings of alpha-particles by Be 9 . Besides, the angular distribution of deuterons from the reaction Be 9 ( p , d ) Be 8 (ground state) was measured. The energies of incident beams were nearly 7 MeV for protons, 14 MeV for deuterons and 28 MeV for alpha-particles. The results, except for B 10 ( p , α)Be 7 and B 11 ( p , α)Be 8 , show forward and/or backward rises and may be interpreted by direct interactions. The integrated cross sections of the reactions ( p , α) and ( d , α) on Be 9 are larger than those on B 10 and B 11 .

ALPHA EMITTING REACTIONS ON Be

The angular distributions have been obtained for alpha-particles from the reactions Be 9 ( p , α) Li 6 (ground state), Be 9 ( d , α) Li 7 (ground, first and second excited states), B 10 ( p , α) Be 7 (ground state), B 10 ( d , α) Be 8 (ground state), B 11 ( p , α) Be 8 (ground state) and B 11 ( d , α) Be 9 (ground and second excited states), and from the elastic and inelastic (second excited state) scatterings of alpha-particles by Be 9 . Besides, the angular distribution of deuterons from the reaction Be 9 ( p , d ) Be 8 (ground state) was measured. The energies of incident beams were nearly 7 MeV for protons, 14 MeV for deuterons and 28 MeV for alpha-particles. The results, except for B 10 ( p , α)Be 7 and B 11 ( p , α)Be 8 , show forward and/or backward rises and may be interpreted by direct interactions. The integrated cross sections of the reactions ( p , α) and ( d , α) on Be 9 are larger than those on B 10 and B 11 .