J un 1 99 3 1 Alpha scattering and capture reactions in the A = 7 system at low energies
نویسندگان
چکیده
Differential cross sections for 3 He-α scattering were measured in the energy range up to 3 MeV. These data together with other available experimental results for 3 He +α and 3 H +α scattering were analyzed in the framework of the optical model using double-folded potentials. The optical potentials obtained were used to calculate the astrophysical S-factors of the capture reactions 3 He(α, γ) 7 Be and 3 H(α, γ) 7 Li, and the branching ratios for the transitions into the two final 7 Be and 7 Li bound states, respectively. For 3 He(α, γ) 7 Be excellent agreement between calculated and experimental data is obtained. For 3 H(α, γ) 7 Li a S(0) value has been found which is a factor of about 1.5 larger than the adopted value. For both capture reactions a similar branching ratio of R = σ(γ 1)/σ(γ 0) ≈ 0.43 has been obtained.
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