Astrophysical reaction rate for the neutron-generator reaction 13C(alpha,n)16O in asymptotic giant branch stars |
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Authors: | Johnson E D Rogachev G V Mukhamedzhanov A M Baby L T Brown S Cluff W T Crisp A M Diffenderfer E Goldberg V Z Green B W Hinners T Hoffman C R Kemper K W Momotyuk O Peplowski P Pipidis A Reynolds R Roeder B T |
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Affiliation: | Department of Physics, Florida State University, Tallahassee, FL 32306, USA. |
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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. |
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