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Added clarification regarding sampling fission reactions.

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Paul Romano 2012-07-26 13:11:12 -04:00
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docs/source/methods/physics.rst
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@ -797,7 +797,8 @@ second-chance fission, etc. An ACE table either lists the partial fission
reactions with secondary energy distributions for each one, or a total fission
reaction with a single secondary energy distribution.
When a fission reaction is sampled in OpenMC, the following algorithm is used to
When a fission reaction is sampled in OpenMC (either total fission or, if data
exists, first- or second-chance fission), the following algorithm is used to
create and store fission sites for the following generation. First, the average
number of prompt and delayed neutrons must be determined to decide whether the
secondary neutrons will be prompt or delayed. This is important because delayed