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. Tribble11 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.
26.20.+f - Hydrostatic stellar nucleosynthesis.
25.60.Je - Transfer reactions.
21.10.Jx - Spectroscopic factors.
© Società Italiana di Fisica, Springer-Verlag 2002