The Multipolarity of γ-ray Absorption in 12C(γ, 3α) Reaction produced by (Li, p)γ-rays

Abstract
The mechanism of the 12 C(γ, 3α) reaction for (Li, p )γ-rays has been estimated from a study of 576 stars in nuclear emulsions. By the analysis of the angular distributions and correlation of the α-particles, the multipolarity of the absorption process of (Li, p )γ-rays by the 12 C nucleus can be explained by the mixture of two sorts of interaction E 1 and E 2. This result is consistent with Goward and Wilkins' conclusion, but our experimental data of the angular distribution of the first α-particles show significant forward asymmetry contrary to their backward asymmetry.

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