A Study of the ^13C(α,n) Reaction Rate Through the ANC Technique

Details A Study of the ^13C(α,n) Reaction Rate Through the ANC Technique A Study of the ^13C(α,n) Reaction Rate Through the ANC Technique

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aps..dnp.ce005j&link_type=abstract

American Physical Society, Division of Nuclear Physics Annual Meeting, October 25-28, 2006, abstract #CE.005

Physics

Nuclear Physics

Scientific paper

The ^13C(α,n) reaction is the main source of neutrons for the s-process. Currently the adopted rate has an uncertainty of ˜300%[C. Angulo et al., Nucl. Phys. A656, 3 (1999)] at the relevant stellar temperatures(˜10^8 K). This leads to a large uncertainty in the modeling of AGB stars, which is where the s-process occurs. Recently, we measured the ANC of the .5ex1-.1em/ -.15em.25ex2 ^+, 6.356 MeV, near threshold state in ^17O. This was done via the α-transfer reaction ^13C(^6Li,d)^17O(.5ex1-.1em/ -.15em.25ex2 ^+, 6.356) at sub-Coulomb energies. Using this information we were able to calculate the contribution of the .5ex1-.1em/ -.15em.25ex2 ^+ state to the astrophysical S-factor. From our S-factor curve we calculated that the ^13C(α,n) reaction rate is reduced by a factor of 3, also the associated uncertainty is improved to ˜15%[E.D. Johnson et al., currently under review with PRL].

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