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We have used effective reaction rates (ERR) for the helium burning reactionsto predict the yield of the gamma-emitting nuclei 26Al, 44Ti, and 60Fe in corecol- lapse supernovae. The variations in the predicted yields for values of thereaction rates allowed by the ERR are much smaller than obtained previously,and smaller than other uncertainties. A "filter" for supernova nucleosynthesisyields based on pre-supernova structure was used to estimate the effect offailed supernovae on the initial mass function-averaged yields; thissubstantially reduced the yields of all these isotopes, but the predicted yieldratio 60Fe/26Al was little affected. The robustness of this ratio is promisingfor comparison with data, but it is larger than observed in nature; possiblecauses for this discrepancy are discussed.

the astrophysical journal. letters

Reducing Uncertainties in the Production of the Gamma Emitting Nuclei  26Al, 44Ti, and 60Fe in Core Collapse Supernovae by Using Effective Helium  Burning Rates