Survey of r ‐Process Models

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Abstract
We present a large survey of r-process nucleosynthesis models. The parameters varied are the initial electron-to-baryon ratio, Ye, the entropy per baryon, s, and the dynamical timescale, τ0. These quantities usefully characterize the abundances expected from any explosive event. The calculations were strictly adiabatic in the sense that s was held constant throughout, which is more realistic than the standard ρ ∝ T3 parameterization. We also assumed steady mass loss and a radial outflow at constant velocity. By focusing on production of the r-process isotopes with mass near A = 195, one of the peaks in the solar system's r-process distribution, we provide constraints on the conditions necessary for production of these isotopes. These constraints should prove useful to supernova modelers seeking the r-process site.