Angular Distribution of (α, p) Reactions in Some Light Nuclei

抄録

The angular distributions of the proton groups corresponding to the lower states of the residual nuclei from the reactions C¹²(α, p)N¹⁵_gnd; F¹⁹(α, p)Ne²²_{gnd, 1.28 MeV}; Al²⁷(α, p)Si³⁰_{gnd, 2.24MeV}; and Si²⁸(α, p)P³¹_{gnd, 1.27, 2.23, 3.13∼3.51 MeV} have been measured using 22.5±0.2 MeV alpha particles. The angular distributions of the C¹²(α, p)N¹⁵_gnd reaction are energy dependent. At 20.6 MeV steep rise in the forward angles is observed, but at 22.2 MeV the steep rise in the backward angles appears instead of the forward rise. The angular distributions of the F¹⁹(α, p)Ne²² reaction are both peaked in the backward angles. The angular distributions of the Al²⁷(α, p)Si³⁰ and the Si²⁸(α, p)P³¹ reactions show the diffraction-like patterns and they are interpreted with Butler’s direct interaction theory.