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Nuclear Reactions Governing The Nucleosynthesis Of 44ti, L.-S. The, Donald D. Clayton, L Jin, Bradley S. Meyer
Nuclear Reactions Governing The Nucleosynthesis Of 44ti, L.-S. The, Donald D. Clayton, L Jin, Bradley S. Meyer
Publications
Large excesses of 44Ca in certain presolar graphite and silicon carbide grains give strong evidence for 44Ti production in supernovae. Furthermore, recent detection of the 44Ti c line from the Cas A super-nova remnant by the Compton Gamma Ray Observatory Compton Telescope shows that radioactive 44Ti is produced in supernovae. These make the 44Ti abundance an observable diagnostic of supernovae. Through use of a nuclear reaction network, we have systematically varied reaction rates and groups of reaction rates to experimentally identify those that govern 44Ti abundance in core-collapse supernova nucleosynthesis. We survey the nuclear-rate dependence by repeated calculations of the …
Theory Of Quasi-Equilibrium Nucelosynthesis And Applications To Matter Expanding From High Temperature And Density, Bradley S. Meyer, Tracy D. Krishnan, Donald D. Clayton
Theory Of Quasi-Equilibrium Nucelosynthesis And Applications To Matter Expanding From High Temperature And Density, Bradley S. Meyer, Tracy D. Krishnan, Donald D. Clayton
Publications
Our first purpose is construction of a formal theory of quasi-equilibrium. We define quasi-equilibrium, in its simplest form, as statistical equilibrium in the face of an extra constraint on the nuclear populations. We show that the extra constraint introduces a uniform translation of the chemical potentials for the heavy nuclei and derive the abundances in terms of it. We then generalize this theory to accommodate any number of constraints. For nucleosynthesis, the most important constraint occurs when the total number of heavy nuclei Yh within a system of nuclei differs from the number that would exist in nuclear statistical equilibrium …