Abstract
Excitation functions and forward-backward anisotropies have been measured for the7Li(p, γ)8Be capture reaction over the proton energy rangeE p =100 to 1500 keV, using a 4π summing crystal and Ge(Li) detectors, respectively. The data show at all energies the presence of El and M1 capture amplitudes arising from the direct capture (DC) process and theE R =441 and 1030 keV resonances, respectively. Due to the observed DC process, the present data increase significantly the reaction rates (up to a factor of 110) compared to values given in the compilation. The data and their analyses remove the recent criticism on DC model calculations, which had implied a significant reduction in the extrapolated S(E) factor for7Be(p,γ)B and thus in the predicted flux of high-energy solar neutrinos; thus, the solar neutrino problem is still with us.
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Supported in part by the Deutsche Forschungsgemeinschaft (Ro429/21-3 and Ro429/21-4) and the German-Hungarian Collaboration (X238.6 and OTKA3808)
The authors would like to thank H.W. Becker, M. Berheide, L. Borucki. S. Kubsky, N. Piel, and F. Strieder for their help and discussions during the course of the experiments.
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Zahnow, D., Angulo, C., Rolfs, C. et al. The S(E) factor of7Li(p, γ)8Be and consequences for S(E) extrapolation in7Be(p, γ0)8B. Z. Physik A - Hadrons and Nuclei 351, 229–236 (1995). https://doi.org/10.1007/BF01289534
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DOI: https://doi.org/10.1007/BF01289534