title: Astrophysical reaction rate for the neutron-generator reaction 13C(alpha,n)16O in asymptotic giant branch stars.
abstract: 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.
authors.affiliation: Department of Physics, Florida State University, Tallahassee, FL 32306, USA.
authors.forename: E D
authors.initials: ED
authors.lastname: Johnson
authors.forename: G V
authors.initials: GV
authors.lastname: Rogachev
authors.forename: A M
authors.initials: AM
authors.lastname: Mukhamedzhanov
authors.forename: L T
authors.initials: LT
authors.lastname: Baby
authors.forename: S
authors.initials: S
authors.lastname: Brown
authors.forename: W T
authors.initials: WT
authors.lastname: Cluff
authors.forename: A M
authors.initials: AM
authors.lastname: Crisp
authors.forename: E
authors.initials: E
authors.lastname: Diffenderfer
authors.forename: V Z
authors.initials: VZ
authors.lastname: Goldberg
authors.forename: B W
authors.initials: BW
authors.lastname: Green
authors.forename: T
authors.initials: T
authors.lastname: Hinners
authors.forename: C R
authors.initials: CR
authors.lastname: Hoffman
authors.forename: K W
authors.initials: KW
authors.lastname: Kemper
authors.forename: O
authors.initials: O
authors.lastname: Momotyuk
authors.forename: P
authors.initials: P
authors.lastname: Peplowski
authors.forename: A
authors.initials: A
authors.lastname: Pipidis
authors.forename: R
authors.initials: R
authors.lastname: Reynolds
authors.forename: B T
authors.initials: BT
authors.lastname: Roeder