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• W1973809886 abstract "We study the sensitivity of presupernova evolution and supernova nucleosynthesis yields of massive stars to variations of the helium-burning reaction rates within the range of their uncertainties. The current solar abundances from Lodders are used for the initial stellar composition. We compute a grid of 12 initial stellar masses and 176 models per stellar mass to explore the effects of independently varying the 12C(α, γ)16O and 3α reaction rates, denoted Rα, 12 and R3α, respectively. The production factors of both the intermediate-mass elements (A = 16–40) and the s-only isotopes along the weak s-process path (70Ge, 76Se, 80Kr, 82Kr, 86Sr, and 87Sr) were found to be in reasonable agreement with predictions for variations of R3α and Rα, 12 of ±25%; the s-only isotopes, however, tend to favor higher values of R3α than the intermediate-mass isotopes. The experimental uncertainty (one standard deviation) in R3α(Rα, 12) is approximately ±10%(±25%). The results show that a more accurate measurement of one of these rates would decrease the uncertainty in the other as inferred from the present calculations. We also observe sharp changes in production factors and standard deviations for small changes in the reaction rates, due to differences in the convection structure of the star. The compactness parameter was used to assess which models would likely explode as successful supernovae, and hence contribute explosive nucleosynthesis yields. We also provide the approximate remnant masses for each model and the carbon mass fractions at the end of core-helium burning as a key parameter for later evolution stages." @default.
• W1973809886 created "2016-06-24" @default.
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• W1973809886 date "2013-04-29" @default.
• W1973809886 modified "2023-09-30" @default.
• W1973809886 title "THE IMPACT OF HELIUM-BURNING REACTION RATES ON MASSIVE STAR EVOLUTION AND NUCLEOSYNTHESIS" @default.
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• W1973809886 doi "https://doi.org/10.1088/0004-637x/769/1/2" @default.
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