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Forum: Particles
Re: None Energy loss of ions (Take Saito)
Date: 31 Aug, 2004
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Tue, 31 Aug 2004, Take R. Saito wrote:

> *** Discussion title: Particles
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/particles/83"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hi, 
>  I am simulating some tracking detectors with ions. 
> I am kepping the velocity beta and the Lorentz factor 
> gamma to be 0.94 and ~3 respectively, which corresponds to 
> ions with about 1.9 A GeV. 
>  I am using /gun/ion command. 
>  If I do "/gun/ion 1 1 1" then it produced "proton". 
>  If I do "/gun/ion 2 4 2" then "alpha". 
> The energy loss in the material of alpha is about 4 
> times larger than for proton and it is consistent to the 
> expected z^2 dependence. However, the strange thing happens
> if I do "/gun/ion 3 6 3". The energy loss is much smaller than 
> for proton and the energy loss doesn't change if I change to 
> different ions and or I change the charge state. 
>  Could somebody help me to solve this problem? 
>  Thank you in advance. 
>  With my best regards, Take
>  

Try to look into example of PhysicsList in 
example/extended/electromagnetic/TestEm7,9 

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