Asymptotic normalization coefficients and the 7Be(p,γ)8B astrophysical S factor
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We consider the results of two proton transfer reactions, 10B(7Be,8B)9Be and 14N(7Be,8B)13C, to obtain a weighted average of the measured asymptotic normalization coefficients for the virtual transition 7Be +p↔8B. These coefficients specify the amplitude of the tail of the 8B overlap function in the 7Be+p channel, and are used to calculate the astrophysical S factor for the direct capture reaction 7Be(p,γ)8B at solar energies, S17(0). In light of recent improvements in the determination of optical-model potentials, including detailed understanding of the correlations between the DWBA analyses of the two experiments, and a new experimental measurement of the asymptotic normalization coefficients for the virtual transition 13C+p↔14N, we report a weighted average asymptotic normalization coefficient of C2p3/2=0.388±0.039 fm-1 for 8B ↔7Be+p, which implies S17(0)=17.3±1.8 eVb.
author list (cited authors)
Azhari, A., Burjan, V., Carstoiu, F., Gagliardi, C. A., Kroha, V., Mukhamedzhanov, A. M., ... Tribble, R. E.