Angular Distributions of (α, n) Reaction on Be and C

抄録

The angular distributions of neutrons from the Be⁹(α, n)C¹² reaction which leaves C¹² in its ground-, 4.43- and 9.6-MeV excited states have been measured for alpha-particle energies between 17.5 and 22.1 MeV. These angular distributions show patterns which may be interpreted in terms of direct interaction theory. The essential feature of the distributions for each neutron group seems not to change with incident energy. The angular distributions of the ground-state neutron group from the C¹²(α, n)O¹⁵ reaction were taken at alpha particle energies from 20.0 to 21.8 MeV. Marked change of distributions with bombarding energies is not found, while it was seen in the C¹²(α, p)N¹⁵ reaction at the same energy range.