From 4e059a4d2b435fae41902a8cef1834b69cc5727c Mon Sep 17 00:00:00 2001 From: Paul Romano Date: Mon, 21 Nov 2016 14:10:40 -0600 Subject: [PATCH] Use isomeric state, not excited state, for fission products. After a discussion with Dave Brown from BNL, it was confirmed that FPS in the ENDF-6 format for fission product yields refers to the isomeric state, not the excited state. --- openmc/data/decay.py | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/openmc/data/decay.py b/openmc/data/decay.py index 35bc113451..41929c034d 100644 --- a/openmc/data/decay.py +++ b/openmc/data/decay.py @@ -114,10 +114,10 @@ class FissionProductYields(EqualityMixin): yields = {} for j in range(n_products): Z, A = divmod(int(values[4*j]), 1000) - excited_state = int(values[4*j + 1]) + isomeric_state = int(values[4*j + 1]) name = ATOMIC_SYMBOL[Z] + str(A) - if excited_state > 0: - name += '_e{}'.format(excited_state) + if isomeric_state > 0: + name += '_m{}'.format(isomeric_state) yield_j = ufloat(values[4*j + 2], values[4*j + 3]) yields[name] = yield_j