Tests of Transfer Reaction Determinations of Astrophysical S-Factors
C. A. Gagliardi, R. E. Tribble, A. Azhari, H. L. Clark, Y. -W. Lui, A. M. Mukhamedzhanov, A. Sattarov, L. Trache, V. Burjan, J. Cejpek, V. Kroha, Š. Piskoř, J. Vincour
Abstract
The 16O (3He,d) 17F reaction has been used to determine asymptotic normalization coefficients for transitions to the ground and first excited states of 17F. The coefficients provide the normalization for the tails of the overlap functions for 17F 16O + p and allow us to calculate the S-factors for 16O (p,γ)17F at astrophysical energies. The calculated S-factors are compared to measurements and found to be in very good agreement. This provides the first test of this indirect method to determine astrophysical direct capture rates using transfer reactions. In addition, our results yield S(0) for capture to the ground and first excited states in 17F, without the uncertainty associated with extrapolation from higher energies.
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