Screening Potential of 6Li(d,\alpha)4He and 7Li(p,\alpha)4He Reactions in Liquid Lithium

概要

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In order to investigate the screening effect of a nuclear reaction in a liquid metal environment, thick-target yields of the 6Li(d,\alpha)4He and 7Li(p,\alpha)4He reactions were measured using a liquid Li target for incident energies between 22.5 and 70 keV. The modified S(E) factor [S^{*}(E)] for the liquid Li environment was deduced by dividing the measured yield by the energy integration of the penetration factor divided by the stopping power. It was shown that S^{*}(E) for the liquid environment is considerably larger than that for the atomic/molecular environment for both reactions. The difference in the screening energy between the two environments was deduced to be \Delta U = 235 \pm 63 (6Li+d) and 140\pm 82 eV (7Li+p), although the screening energy for liquid Li has a large uncertainty with U_{\text{liq}}\sim 486{\mbox{--}}776 (6Li+d) and 324--637 eV (7Li+p) owing to the uncertainty of the astrophysical bare S(E) factors. This difference in the screening energy should be considered in such a way that, in liquid Li metal, conduction electrons and Li+ ions contribute to the screening in addition to bound electrons.
2011-08-15