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Forum: Event and Track Management
Re: Question Confusion about G4Step
Date: 18 Aug, 2017
From: Makoto Asai <Makoto Asai>

You should check the process for PostStepPoint.

On Fri, 18 Aug 2017 22:36:13 GMT, frolandh wrote:
> To Whom it May Concern,
> I'm trying to determine angles in elastic collisions, which I get from
> the momentum vector of the parent particle's prestep point and the
> momentum vector of the secondary particle's track (from the function
> GetSecondaryInCurrentStep()). I specify the parent prestep point's
> process to be "hadElastic", however the momentum of the parent from
> prestep to poststep doesn't change, which confuses me.
> How can I get the momentum direction of the parent particle right before
> an elastic collision with a secondary particle?
> Thank you

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