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Is there any software which is able to simulate D-T interaction for example and get temperature-crosssection curve without referencing to any experimental data?

Do we have quantum-level simulation working for anything more complex than hydrogen?

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This is usually in a resonance region--- you have intermediate bound states that decay to the final product, and so it is very difficult to model. I doubt there is canned software. It should be doable using an effective field theory, but I don't think the code exists, or the measurements on the bound state properties. – Ron Maimon Sep 24 '12 at 7:44
Geant can presumably simulate this reaction, but it will be based on a parameterization of the data rather than an ab inito calculation, so I assume that is not what you want. There are certainly some low level simulation of moderately complex systems, but not being a specialist in that area I can't tell you either where to look or what is currently cutting edge. – dmckee♦ Sep 24 '12 at 23:08

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