The calculation of thermonuclear reaction rates is a complicated and involved process.
General information on reaction rates can be found in a recent textbook.
The rates are calculated according to a method described here. In brief, each nuclear
physics input quantity has an assigned probability density function. A code, called "RatesMC", samples
these functions randomly many times using a Monte Carlo algorithm, and outputs reaction rates and associated
rate probability densities. More information can be found under Details. Running this code on our server requires registering and logging into our site, though input files are freely available.
If you would like to compute reaction rates with the code "RatesMC", you need to
supply an input file that contains the nuclear physics input [that is, quantities such as
resonance energies and strengths, non-resonant S-factors, partial widths, upper limits,
and so on]. The input file must be in the same format as those published here and here.
That paper also explains the input file format.
~ Starting the MC Simulation ~
Display Default Input Files
To run the Monte Carlo simulation on our STARLIB server, copy/paste the input file for your
desired reaction into the box below. The format of the input file is very important, so
it will be easier for you to edit an existing input file (based on our
evaluation). You can access
the appropriate file for your desired reaction by using the submission boxes (see RateLibrary or click for explanation of input formats).
It is assumed that all nuclides are in their ground states. For special cases, metastable states can be chosen (see Details).
The input file will appear in the box below and may be copied/pasted into a
text editor. As an example, the input file for the 22Na(p,g)23Mg reaction is shown below.
Sample input file for 22Na(p,g)23Mg :
~ Monitoring the MC Simulation ~
Access Output Files
To monitor your simulations, abort simulations, and download output files, enter the email address you used to begin your simulations.
These pages are maintained by Anne Sallaska and Christian Iliadis, in collaboration with Art Champagne (UNC),
Sumner Starrfield (ASU), and Frank Timmes (ASU). For comments, send a message to the webmaster.
Supported by the National Science Foundation under award number AST-1008355 and
by the DOE under grant number DE-FG02-97ER41041.