Stellar Synthesis of the α-Particle Nuclei Heavier than Ne^<20>

概要

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The rates of (α,γ) and (γ,α) reactions at temperatures above 5×10^8°K for α-particle nuclei, Ne^<20>, Mg^<24>, Si^<28>, S^<32>, A^<36>, and Ca^<40> are calculated as well as heavy ion reactions such as C^<12>+C^<12>→Ne^<20>+α, etc. The stellar condition, under which the cosmical abundances of the α-particle nuclei can be explained in terms of the above nuclear reactions, is investigated by using these results. At high temperature T=2~3×10^9 °K the cosmical abundances of α-particle nuclei can be reproduced by taking the matter density ρ as 1~10^2g cm^<-3>. Such a stellar condition may be realized in the supernova explosion. It is shown that, to explain the cosmical abundances in concern by the equilibrium theory, T> 5×10^9 °K and ρ10^5g cm^<-3> are required.
理論物理学刊行会の論文
1959-07-25