Default isomeric branching ratios
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Revision as of 13:30, 24 September 2016 by Jaakko Leppänen (Talk | contribs) (Created page with "Branching ratios to isomeric states are used in burnup calculation for the production of long-lived meta-stable nuclides, such as <sup>241m</sup>Am or <sup>148m</sup>Pm. The d...")
Branching ratios to isomeric states are used in burnup calculation for the production of long-lived meta-stable nuclides, such as 241mAm or 148mPm. The data is not available in ACE format cross section libraries and must therefore be obtained elsewhere. Serpent provides three options for defining the branching ratios:
- Use of default constant ratios (see table below)
- Use of user-defined constant ratios (see the set isobra option)
- Use of energy-dependent ratios read from ENDF format files (see the set bralib option)
User-defined constant ratios override the default values, energy-dependent data overrides constant ratios.
The default constant branching ratios from update 2.1.27 on are:
