Problem 628

Summary: GetCharge method of G4StepPoint returns peculiar value for charge
Product: Geant4 Reporter: corneliu
Component: trackingAssignee: kurasige
Status: RESOLVED INVALID    
Severity: normal    
Priority: P2    
Version: 6.1   
Hardware: PC   
OS: Linux   

Description corneliu 2004-05-27 08:29:40 CEST 
Hi,
 I've encountered a problem with the GetCharge method of the G4StepPoint class.
It is returning very strange values for the charge of GenericIons (eg. 2.1 for
Oxygen-16??). These ions are produced in fragmentation reactions using the
G4LightIonBinaryCascade model. I am using geant4.6.1 linux redhat 9.0 gcc 3.2.
Regards,
Iwan
Comment 1 kurasige 2004-06-06 10:10:59 CEST 
It is not a bug.
The GetCharge method of the G4StepPoint gives "dynamic" charge of the particle.
For the ions produced by hadronic processes, PDGCharge in G4ParticleDefinition
is the charge of the nucleus (i.e. equal to atomic number * eplus). On the other
hand, the dynamic charge is the effective charge of the ion (see
G4EffectiveCharge class under processes/hadronic/util).
In Geant4, eplus is set to 1 (see CLHEP/Units/SystemOfUnits.h). So, the value of
2.1 is OK.