Computational Infrastructure for Nuclear Astrophysics Scientific tool for generating thermonuclear reactions
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simulation simulate simulator physics simulator

Computational Infrastructure for Nuclear Astrophysics Description

Computational Infrastructure for Nuclear Astrophysics is a tool that can generate thermonuclear reaction rates from nuclear physics input. You can also create, merge, store, browse, and share libraries of reaction rates, plot rates and access rate parameters. Furthermore, you can calculate element synthesis occurring in astrophysical environments. A program in the Rate Generator calculates the thermonuclear reaction rate as a function of temperature from pointwise cross sections and S-factors as a function of energy. The reaction rate at a given temperature is the product of the cross section and relative velocity averaged over the Maxwell-Boltzmann relative energy distribution at that temperature. The original input data set can be interpolated and / or extrapolated using cubic splines and polynomials to improve the numerical integration. The program automatically searches for narrow resonances and treats these differently from smoothly varying energy intervals. Typically, 5,000~30,000 interpolated data points are numerically integrated using a Riemann sum approach. The integration is repeated typically for 60 temperature values over a range determined by calculating the Gamow window for the input data set. The program has been tested by comparing its results to those using 3 similar codes, as well as by integrating functions that can be solved analytically. The results of those tests will be made available upon request.

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