Branching ratios for 3He(α,γ)7Be and 3H(α,γ)7Li

Physics – Nuclear Physics

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3H-, 3He-, And 4He-Induced Reactions, Origin, Formation, And Abundances Of The Elements

Scientific paper

Branching ratios for radiative alpha capture by tritium and 3He have been studied in a kinematical direct capture model for the purpose of obtaining an independent derivation of the 3H(α,γ)7Li branching ratio and possibly resolving an apparent discrepancy in the experimentally measured value. From the mirror symmetry between 7Li and 7Be, and the observed branching ratio R(0)=0.38+/-0.04(1σ) for the 3He(α,γ)7Be reaction, the branching ratio for the 3H(α,γ)7Li reaction is constrained to be R(0)=0.47+/-0.07, which agrees best with the higher measured value. The implication of these results for big-bang nucleosynthesis in standard and nonstandard models is discussed.

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