Editing Default isomeric branching ratios (section)

== Calculating branching ratios from energy-dependent data ==

Calculating branching ratios from energy-dependent data is relatively easy using standard detectors. For example, the capture fractions of <sup>241</sup>Am to ground and metastable state of <sup>242</sup>Am can be obtained with detector input:

 <nowiki>
% --- Detector material:

mat Am241 1.0 95241.09c 1.0

% --- Detector: (reaction rates using spectrum in material "fuel")

det 1
dm fuel
dr 102 Am241 dr 102g  Am241 dr 102m  Am241</nowiki>

Branching ratios to ground and metastable states can then be obtained by dividing the results in the 2nd and 3rd detector bin with the result of the first bin. The ground state fraction can then be used as the input for the [[Input syntax manual#set isobra|set isobra]] card.

For a complete example, see:
* [[Branching ratio example|Serpent input file and post-processing script]]
* Energy-dependent branching data from JEFF-3.1 activation file: [[File:JEFF-3.1_activation_file.tgz]].

[[Category:Input]]