Eur. Phys. J. A 13, 227-232 (2002)

Asymptotic normalization coefficients and astrophysical direct capture rates

C.A. Gagliardi¹, A. Azhari¹, V. Burjan², F. Carstoiu³, V. Kroha², A.M. Mukhamedzhanov¹, A. Sattarov¹, X. Tang¹, L. Trache¹ and R.E. Tribble<sup>1

1</sup>  Cyclotron Institute, Texas A&M University, College Station, TX 77843, USA
²  Institute for Nuclear Physics, Czech Academy of Sciences, Prague-Rez, Czech Republic
³  Institute for Atomic Physics, Bucharest, Romania

(Received: 1 May 2001)

Abstract
Peripheral transfer reactions can be used to determine asymptotic normalization coefficients (ANCs). These coefficients, which specify the normalization of the tail of the nuclear overlap function, determine S-factors for direct capture reactions at astrophysical energies. A variety of proton transfer reactions involving both stable and radioactive beams have been used to measure ANCs. Tests have demonstrated that ANCs determined from proton transfer reactions can be used to calculate astrophysical direct capture rates to within 9%. The ¹⁰B( ⁷Be, ⁸B) ⁹Be and ¹⁴N( ⁷Be, ⁸B) ¹³C reactions have been used to measure the ANC appropriate for determining the ⁷Be( ) ⁸B rate, and the ¹⁴N( ¹¹C, ¹²N) ¹³C reaction has been used to measure the ANC required to calculate the ¹¹C( ) ¹²N rate.

PACS
26.20.+f - Hydrostatic stellar nucleosynthesis.
25.60.Je - Transfer reactions.
21.10.Jx - Spectroscopic factors.

© Società Italiana di Fisica, Springer-Verlag 2002