Angular Distributions of the Alpha-Particles and of the Gamma-Rays from the Disintegration of Fluorine by Protons.

摘要

The theoretical angular distributions of the alpha-particles and to the gamma-rays from the fluorine + proton reactions are given. They are compared with the experimental data, and the following results are obtained: Both angular distributions of the alpha sub pi-group and of the alpha sub o-group favor the assumption of even parity of F(19). If the parity of F(19) is taken as even, then (a) the isotropic angular distribution of the gamma-rays at the resonances of 340 and 669 kev can be interpreted as due to the formation of Ne(20) compound states of J = 1(+) by the capture of s-protons, (b) the slightly anisotropic angular distribution of the gamma-rays at the resonances of 598, 874, and 1381 kev can be interpreted as due to the formation of Ne(20) states of J = 1(+) by a mixture of s- and d-protons, or of J = 2(-) by p-protons, (c) the highly anisotropic distribution of the gamma-rays observed at 1290 and 1355 kev can be interpreted as due to the formation of Ne(20) states of J = 3(+), and (d) the experimental data of the gamma-ray angular distribution and of the ratio I(alpha)140 deg/I(gamma)90 degree compatible with the assignment j' = 3(-) for the gamma 1-level of O(16). (AN).