Astrophysical reaction rate for the neutron-generator reaction 13C(alpha,n)16O in asymptotic giant branch stars.
The reaction 13C(alpha,n) is considered to be the main source of neutrons for the s process in asymptotic giant branch stars. At low energies, the cross section is dominated by the 1/2+ 6.356 MeV subthreshold resonance in (17)O whose contribution at stellar temperatures is uncertain by a factor of 10. In this work, we performed the most precise determination of the low-energy astrophysical S factor using the indirect asymptotic normalization (ANC) technique. The alpha-particle ANC for the subthreshold state has been measured using the sub-Coulomb alpha-transfer reaction ((6)Li,d). Using the determined ANC, we calculated S(0), which turns out to be an order of magnitude smaller than in the nuclear astrophysics compilation of reaction rates.
Johnson
E D
ED
Department of Physics, Florida State University, Tallahassee, FL 32306, USA.
Rogachev
G V
GV
Mukhamedzhanov
A M
AM
Baby
L T
LT
Brown
S
S
Cluff
W T
WT
Crisp
A M
AM
Diffenderfer
E
E
Goldberg
V Z
VZ
Green
B W
BW
Hinners
T
T
Hoffman
C R
CR
Kemper
K W
KW
Momotyuk
O
O
Peplowski
P
P
Pipidis
A
A
Reynolds
R
R
Roeder
B T
BT