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Forum: Biasing and Scoring
Re: Question Negative number of interaction length warning with GEANT4.10.1 (Stefan E. Mueller)
Date: 07 Jan, 2015
From: Marc Verderi <Marc Verderi>

Hi Stefan,

I believe I understand the reason of this. Please try to update your 
code on the basis on GB01.

Best regards,
Marc

On 01/07/2015 12:14 PM, Stefan E. Mueller wrote:
> *** Discussion title: Biasing and Scoring
>
> 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
>
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