p′−γAngular Correlation in the Inelastic Scattering of 16.6-Mev Protons byMg24

Abstract

The angular correlation between the inelastically scattered protons leaving the first excited state of ${\mathrm{Mg}}^{24}$ (1.37 Mev, 2+) and its de-excitation gamma rays produced by the bombardment of 16.6-Mev protons on a natural magnesium target has been investigated. For ${{\theta }_p}^{\prime }=30\mathrm{}°, 42.5°, \mathrm{and} 70°$ the result shows that the correlation functions are represented fairly well by the simple Born approximation calculation, ${sin}^{2}2({\theta }_{\gamma }-{\theta }_0)$. However, at larger angles, ${{\theta }_p}^{\prime }=95\mathrm{}°, 120°, \mathrm{and} 150°$, changes in the shapes of correlation curves are observed, introducing a contribution from a ${sin}^2({\theta }_{\gamma }-{{\theta }_0}^{\prime })$ term. This fact suggests the existence of exchange effect as well as the distortion effect in the present nuclear reactions.