Reanalysis of the astrophysicalS(E) factors of the⁶Li(d,α)⁴He,⁷Li(p,α)⁴He and⁶Li(p,α)³He reactions

Abstract

The experimental data of the 6Li(d,α)4He,7Li(p,α)4He and 6Li(p,α)3He reactions obtained by other groups are reanalyzed in this work to extract their respective astrophysical S(E) factors and the screening energies provided by different environments (LiF solid targets and molecular H2 or D2 gas targets). Different from previous authors who investigated these three reactions independently, we study them simultaneously, based on the hypothesis that the screening effects are independent of the isotopic effects and the fact that the screening effects depend on the environments. The present extracted astrophysical S(E) factors result in Sbare(0) = 20.5 ± 0.5, 0.0616 ± 0.0017 and 3.63 ± 0.13 MeV b for the 6Li(d,α)4He, 7Li(p,α)4He and 6Li(p,α)3He reactions, respectively. The screening energies are 310 ± 109 and 218 ± 38 eV for the LiF solid targets and molecular H2 or D2 gas targets, respectively. These deduced screening energies are smaller than that observed by Engstler et al, and the value of Us = 218 ± 38 eV for the molecular H2 or D2 gas targets coincides with the value of 186 eV estimated from the adiabatic limit, while the value of Us = 310 ± 109 eV for the LiF solid targets is still slightly larger than that estimated from theoretical predictions.