The 7Li(ρ, γ0)8Be reaction is studied in a microscopic cluster model. All relevant subsystem properties are well reproduced. The calculated astrophysical S-factor is in good agreement with the experimental data, although some M1 strength is missing in the 1 + ; 1 resonance region, and there is no contribution from the 1+ ; 0 state. Our model predicts, in contradiction to experiment, a dominant I = 1 channel spin contribution to the cross section. We estimate an M1 strength of 3.5% at 80 keV. By assuming the experimental resonance parameters and channel spin ratio for the first 1+ state that M1 strength is 6.3%, in good agreement with an R-matrix analysis.
ASJC Scopus subject areas
- Nuclear and High Energy Physics