The Li-6(p, alpha)He-3 and Li-7(p, alpha)He-4 reaction cross sections were obtained for E = 90-580 keV and E = 90-1740 keV, respectively. R-matrix and polynomial fits to the bare astrophysical S-factor confirmed, with improved accuracy, previous work data, yielding S-b(0) = 3.52 +/- 0.08 MeV b, and 55.6(-1.7)(+0.8) keV b for the Li-6 and Li-7 reactions, respectively. Therefore, the astrophysical consequences related to these two isotopes remain essentially unchanged. With the present work S-b(E) data, a reanalysis of the low energy data for different environments-Li2WO4 insulator, Li metal, and PdLix alloys-confirms that the large electron screening effects can be explained by the plasma model of Debye applied to the quasi-free electrons in the metallic samples.
|Number of pages||6|
|Journal||Journal of Physics G: Nuclear and Particle Physics|
|Publication status||Published - Jan 2008|
- D+D FUSION REACTIONS
- LI-6(P,HE-3)HE-4 REACTION
- DEUTERATED METALS
- S(E) FACTOR