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Forum: Particles
Re: Question How do I define 37Ar^- (Spencer Behling)
Date: 19 Aug, 2011
From: Spencer Behling <Spencer Behling>

I am able to get a partially working version of 37Ar^{1-}. After playing around with things more I did the following

G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable(); G4ParticleDefinition* ion = particleTable->GetIon(18,37,0); vertex = new G4PrimaryVertex(EventVertex,0); G4PrimaryParticle* particle = new G4PrimaryParticle(ion, evMaker->dMomentumX(), evMaker->dMomentumY(), evMaker->dMomentumZ()); particle->SetMass(massOf37ArMinus*MeV/c_squared); particle->SetCharge(-1.*eplus); vertex->SetPrimary(particle);

That works except for the decay to Ar37 + e-. I am still working on a scheme to deal with that.

What makes me sad is that geant cannot draw this particle the right way. See the attached picture. If I also create a positron and draw the particles by charge then they both come out the same color. It is clear from the picture that the tracking thinks that the positron and ion are charged differently since they propagate in an electric field in opposite directions. If I use an electron the track is red as expected. I wonder if this is the correct way to define Ar{1-}? If I did it properly in the way that geant expected would it then behave properly or am I doing it the right way and this is just a bug?

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/08/19/07.48-96007-geantFub.png

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1 Feedback: Re: How do I define 37Ar^-   (Gumplinger Peter - 19 Aug, 2011)
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