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• W4383314135 endingPage "A22" @default.
• W4383314135 startingPage "A22" @default.
• W4383314135 abstract "Context. The γ -process nucleosynthesis in core-collapse supernovae is generally accepted as a feasible process for the synthesis of neutron-deficient isotopes beyond iron. However, crucial discrepancies between theory and observations still exist: the average yields of γ -process nucleosynthesis from massive stars are still insufficient to reproduce the solar distribution in galactic chemical evolution calculations, and the yields of the Mo and Ru isotopes are a factor of ten lower than the yields of the other γ -process nuclei. Aims. We investigate the γ -process in five sets of core-collapse supernova models published in the literature with initial masses of 15, 20, and 25 M ⊙ at solar metallicity. Methods. We compared the γ -process overproduction factors from the different models. To highlight the possible effect of nuclear physics input, we also considered 23 ratios of two isotopes close to each other in mass relative to their solar values. Further, we investigated the contribution of C–O shell mergers in the supernova progenitors as an additional site of the γ -process. Results. Our analysis shows that a large scatter among the different models exists for both the γ -process integrated yields and the isotopic ratios. We find only ten ratios that agree with their solar values, all the others differ by at least a factor of three from the solar values in all the considered sets of models. The γ -process within C–O shell mergers mostly influences the isotopic ratios that involve intermediate and heavy proton-rich isotopes with A > 100. Conclusions. We conclude that there are large discrepancies both among the different data sets and between the model predictions and the solar abundance distribution. More calculations are needed; particularly updating the nuclear network, because the majority of the models considered in this work do not use the latest reaction rates for the γ -process nucleosynthesis. Moreover, the role of C–O shell mergers requires further investigation." @default.
• W4383314135 created "2023-07-07" @default.
• W4383314135 creator A5001465784 @default.
• W4383314135 creator A5031652360 @default.
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• W4383314135 creator A5048418222 @default.
• W4383314135 creator A5079368755 @default.
• W4383314135 creator A5084015104 @default.
• W4383314135 date "2023-08-25" @default.
• W4383314135 modified "2023-09-27" @default.
• W4383314135 title "The gamma-process nucleosynthesis in core-collapse supernovae. I. A novel analysis of gamma-process yields in massive stars" @default.
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