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Forum: Particles
Re: None production of GenericIon (Sara Vecchio)
Date: 06 Aug, 2005
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Fri, 15 Jul 2005, Sara Vecchio wrote:

> *** Discussion title: Particles
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/particles/156"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> By shooting protons on PMMA through a very complicated beam line (made
> of different materials), when I look the tracking verbosity I see a
> large variety of ions: C12, C13, O16, N15, O17, Be8, B11, Al27.. No C11,
> O15, C10 appear but this may be due by a wrong physics list, since I've
> seen them in previous simulations.
> 
> But I also see, quite often, the tracking of a "Generic Ion" (I've not
> yet checked whether they can also decay). If all the isotopes are
> identified by theirname and mass number.. what does the GenericIon stand
> for? Can this behaviour due to the physics list, too?
> 
> *********************************************************************************************************
> * G4Track Information:   Particle = neutron,   Track ID = 1293,   Parent ID = 1288
> *********************************************************************************************************
> 
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>     0     -128     47.7    -6.95      1.42        0        0         0 patientPhys initStep
>     1     -127     46.8    -5.57      1.42        0     1.82      1.82 patientPhys LElastic
>     2     -126     44.9    -2.86      1.35        0     3.57      5.39 patientPhys LElastic
>     3     -123     39.9     7.76      1.35        0     12.1      17.4 patientPhys LElastic
>     4     -116     26.9     35.2      1.35        0     31.2      48.6 patientPhys LElastic
>     5     -110     14.8     60.8         0        0     29.1      77.7 patientPhys LElastic
> 
> *********************************************************************************************************
> * G4Track Information:   Particle = GenericIon,   Track ID = 1296,   Parent ID = 1293
> *********************************************************************************************************
> 
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>     0     -126     44.9    -2.86    0.0705        0        0         0 patientPhys initStep
>     1     -126     44.9    -2.86    0.0355    0.035 0.000312  0.000312 patientPhys hLowEIoni
>     2     -126     44.9    -2.86   0.00917   0.0263 0.000312  0.000625 patientPhys hLowEIoni
>     3     -126     44.9    -2.86         0  0.00917 0.000312  0.000937 patientPhys hLowEIoni
>     4     -126     44.9    -2.86         0        0        0  0.000937 patientPhys RadioactiveDecay
> 
> 

Hi Sara,

If the problem still exist it may be a subject of bug report - GenericIon 
should not be created and tracked in any application.

If you will be able to trace in which interaction such particle was 
created, then it will help a lot to fix.

VI

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1 None: Re: production of GenericIon   (Sara Vecchio - 09 Sep, 2005)
(_ None: Re: production of GenericIon   (vnivanch@mail.cern.ch - 09 Sep, 2005)
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