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Re: Question he3 energy losses
Date: 23 Apr, 2017
From: Michael H. Kelsey <Michael H. Kelsey>

On Sun, 23 Apr 2017 08:03:54 GMT, elder wrote:
> Hello All,
> 
>   recently I have included he3 ions into my Geant4.10.1  simulations. My experimental setup is pretty simple: vacuum, air (400 mm), two sets of plastic BC-408 scintillation detectors (thin 2 mm and 20 mm thick).
> In PhysicsList I have the following processes:
> 
> if (particleName == "alpha"||particleName == "deuteron"|| particleName == "He3" ||particleName == "triton")
>     {
>       G4ionIonisation* ionIoni = new G4ionIonisation();
>       pmanager->AddProcess(new G4hMultipleScattering, -1, 1, 1);
>       pmanager->AddProcess(ionIoni,       -1, 2, 2);
> 
>       }
> 
> When I check tritons energy losses in each part of the setup, the
> results seems ok (confirmed with TRIM calculations), whereas for He3
> energy losses are too high. I have checked this for Geant4.10.1 as well
> as for the latest version of Geatn4. I have used ions energies around
> 100-200 MeV. For example: He3 energy at 20 deg :
> 
> ~ 230 MeV to reach the thick detector (it should be around 40 MeV ...)
> 
> ~ 120 MeV to reach the thin detector
> 
> tritons energy at 20 deg :
> 
> ~ 40 MeV to reach the thick detector
> 
> ~ 23 MeV to reach the thin detector
> 
> I have used defaultCutValue=0.02 mm and tested with higher and lower
> values, with no success for He3.
> 
> Can U comment on this ? It seems like for He3 stopping power is too
> high.

You'll need to look at the cross-section data used in G4 to be sure, but just naively, since He3 has twice the charge of H3, the dE/dx should be higher by a factor of four, which will radically increase the stopping power.

    -- Michael Kelsey

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1 Feedback: Re: he3 energy losses   (elder - 24 Apr, 2017)
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