Recent Results for Proton Capture S Factors from Measurements of Asymptotic Normalization Coefficients

Details Recent Results for Proton Capture S Factors from Measurements of Asymptotic Normalization Coefficients Recent Results for Proton Capture S Factors from Measurements of Asymptotic Normalization Coefficients

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf..143t&link_type=abstract

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,

Astronomy and Astrophysics

Astrophysics

Scientific paper

Asymptotic normalization coefficients (ANCs) have proven to be useful for determining reaction rates of interest in nuclear astrophysics. These coefficients, which provide the normalization of the tail of the overlap function, determine S factors for direct capture reactions at astrophysical energies. They also can be related to resonance capture rates and are particularly useful for determining proton-capture reaction rates that involve subthreshold resonance states. During the past eight years, many ANCs have been measured by peripheral transfer reactions. Recent proton transfer reaction measurements have yielded ANCs for 14O → 13N + p, 15O → 14N + p and 21Na → 20Ne + p. These results have been used to find S factors for 13N(p,γ)14O, 14N(p,γ)15O and 20Ne(p,γ)21Na. Using mirror symmetry, the 13C(7Li,8Li)12C reaction has been used to obtain a new measurement of the ANC that defines the S factor for 7Be(p,γ)8B. Following an introduction to ANCs, the recent experiments are discussed along with the astrophysical implications of these measurements.

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