Global R-Matrix Analysis of the 12C(alpha,gamma) 16O Reaction, Carl Brune, Ohio University − The 12C(α,γ)16O reaction, in combination with the triple-alpha process, determines the 12C/16O fraction at the end of stellar helium-burning.  This fraction has been shown to strongly influence any subsequent stellar evolution and, due to imprecise knowledge of 12C(α,γ)16O reaction rate, complicates precision tests of stellar models.  A global R-matrix analysis of the available data relevant to the low-energy 12C(α,γ)16O cross section, including recent measurements of the angular distribution isotropy of the narrow 2.68-MeV resonance, will be presented.  The thermonuclear reaction rate, error analysis, and recommendations for future experiments will also be discussed.