The effect of 12C + 12C rate uncertainties on s-process yields

Abstract

The slow neutron capture process in massive stars (the weak s-process) produces most of the s-only isotopes in the mass region 60 < A < 90. The nuclear reaction rates used in simulations of this process have a profound effect on the final s-process yields. We generated 1D stellar models of a 25 solar mass star varying the 12C + 12C rate by a factor of 10 and calculated full nucleosynthesis using the post-processing code PPN. Increasing or decreasing the rate by a factor of 10 affects the convective history and nucleosynthesis, and consequently the final yields.

Conference proceedings for the Nuclear Physics in Astrophysics IV conference, 8-12 June 2009. 4 pages, 3 figures. Accepted for publication to the Journal of Physics: Conference Series

References in corpus (4)

• Study of the 12C+12C fusion reactions near the Gamow energy
• s-Process Nucleosynthesis in Advanced Burning Phases of Massive Stars
• The 12C(alpha,gamma)16O Reaction Rate and the Evolution of Stars in the Mass Range 0.8 < M/M(sun) < 25
• Evolution of Massive Stars Up to the End of Central Oxygen Burning

Cited by in corpus (4)

• The s Process: Nuclear Physics, Stellar Models, Observations
• The effect of 12C + 12C rate uncertainties on the evolution and nucleosynthesis of massive stars
• Type Ia supernovae and the ^{12}C+^{12}C reaction rate
• Convective overshooting and production of s-nuclei in massive stars during their core He-burning phase