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Fix Th-234 LNHB ensdf parsing #1270

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Fix the parsing of Th-234 in the LNHB ensdf file. This change checks for repeated levels with the same energy and different spin-parity that are included in the ensdf file to represent an isomeric transition. The low probability level is neglected now, because no probability is provided for the transition. Previously, both levels contained high probability beta decays towards them and were treated equivalently, leading to an incorrect decay scheme. Note that the NNDC Th-234 ensdf file was treated correctly.

@rtownson rtownson added the bug label Mar 18, 2025
@rtownson rtownson added this to the Release 2026 milestone Mar 18, 2025
@rtownson rtownson self-assigned this Mar 18, 2025
@rtownson rtownson requested a review from a team as a code owner March 18, 2025 13:57
Fix the parsing of Th-234 in the LNHB ensdf file. This change checks for
repeated levels with the same energy and different spin-parity that are
included in the ensdf file to represent an isomeric transition. The low
probability level is neglected now, because no probability is provided
for the transition. Previously, both levels contained high probability
beta decays towards them and were treated equivalently, leading to
an incorrect decay scheme.
@rtownson rtownson force-pushed the fix-radionuclide-th-234 branch from ee65b9f to caba693 Compare March 18, 2025 14:03
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