Message: Negative number of interaction length warning with GEANT4.10.1 Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

Question Negative number of interaction length warning with GEANT4.10.1 

Forum: Biasing and Scoring
Date: 07 Jan, 2015
From: Stefan E. Mueller <Stefan E. Mueller>

Hi,

I have an application in which I bias the cross section for the processes "GammaToMuPair" and "muonNuclear".

Running this application with GEANT 4.10.1, I see a lot of warnings in the logfile:

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : BIAS.GEN.13
      issued by : G4InteractionLawPhysical::UpdateInteractionLengthForStep(...)
 Negative number of interaction length for `LawForOperationXSchange-GammaToMuPair' -0.000202403, set it to zero !

*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------
(I get similar warnings for the "muonNuclear"-process).

This was not the case when running with GEANT4.10.0-Patch3. 

It might be just a warning, however, I am a little bit confused about the possibility that an interaction
 length can become negative at all (and then is set to zero!). 

The scaling factors which I provide to bias the cross sections are in any case positive.

Is this behavior of geant 4.10.1 intended?

Best regards,

Stefan

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 None: Re: Negative number of interaction length warning with GEANT4.10.1   (Marc Verderi - 07 Jan, 2015)
(_ Ok: Re: Negative number of interaction length warning with GEANT4.10.1   (Stefan E. Mueller - 09 Jan, 2015)
 Add Message Add Message
to: "Negative number of interaction length warning with GEANT4.10.1"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews