Problem 970

Summary: Branching ratio of weak gamma lines artificially set to 1e-5
Product: Geant4 Reporter: Luciano Pandola <luciano.pandola>
Component: processes/hadronic/models/de_excitation/photon_evaporationAssignee: aatos.heikkinen
Status: RESOLVED FIXED    
Severity: trivial    
Priority: P5    
Version: other   
Hardware: All   
OS: All   

Description Luciano Pandola 2007-09-20 14:36:27 CEST 
The branching ratio of all very weak gamma lines (< 1-e5) is artificially set to 1e-5. This causes some rare lines to be produced more often than in the reality. While in most applications the effect is negligible, it may have an importance for  the 2505-keV line of Co-60 (table of isotopes: 2e-8, Geant4: 1e-5).

The problem comes from line #189 of G4NuclearLevelManager.cc:
const G4double minProbability = 0.001;

I suggest this value to be substantially lowered, e.g.
const G4double minProbability = 1e-8;
Comment 1 Luciano Pandola 2008-01-31 16:04:49 CET 
The bug has been fixed (see patch described below) in version 9.1.