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Forum: Hadronic Processes
Re: None First inelastic interaction point of hadronic processes (Soon Yung Jun)
Date: 10 Apr, 2007
From: michel maire <michel maire>

User Soon Yung Jun wrote:

>> To get the first inelastic interaction point of pions inside a G4Region 
>> (an envelope for G4VFastSimulationModel), I tried the following code 
>> segment;
>> 
>> G4StepPoint* postStep = fastTrack.GetPrimaryTrack()->GetStep()->GetPostStepPoint();
>> G4String procName = postStep->GetProcessDefinedStep()->GetProcessName();  
>> 
>> if(procName == "PionPlusInelastic" || procName == "PionMinusInelastic") {
>>   isFirst = true;
>> }
>> 
>> The resultant total step length (x) after pions enter a detector volume
>> (an envelope) by this method gave much shorter distance than expected - 
>> I expect that the first inelatic interaction point would follow 
>> exp^{-x/lambda0} where lambda0 is the interaction length of the detector.  
>> What am I missing?  Thanks for your help.
>> 

 1 - Is the envelope the first volume ? or the pion has already
 travelled in previous volume(s) ?

 2 - Is the size of the envelope big enough compared to lambda0 ? 
 otherwise the result is biased by non interactive pions.

                    Michel Maire

 examples/extended/electromagnetic/TestEm14 (and Em13) does this
 computation in case of electromagnetic interactions. See Readme    

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1 None: Re: First inelastic interaction point of hadronic processes   (Soon Yung Jun - 10 Apr, 2007)
(_ None: Re: First inelastic interaction point of hadronic processes   (michel maire - 12 Apr, 2007)
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