Comparison of the LUNA He-3(alpha,gamma)Be-7 activation results with earlier measurements and model calculations

Recently, the LUNA collaboration has carried out a high precision measurement on the He-3(alpha,gamma)Be-7 reaction cross section with both activation and online gamma-detection methods at unprecedented low energies. In this paper the results obtained with the activation method are summarized. The results are compared with previous activation experiments, and the zero energy extrapolated astrophysical S factor is determined using different theoretical models.