Just to complete this;
adding this functionality to VMC was required by Geant4
VMC users; it is available from the version 1.1
of Geant4 VMC.
Best regards,
Ivana
==============================================================
e-mail: Ivana.Hrivnacova@cern.ch
address: Institut Physique Nucleaire, 91406 Orsay, France
phone: (33) 01 69 15 65 94
==============================================================
On Thu, 18 Dec 2003, Federico Carminati wrote:
> Right,
> what happens is fundamentally NOTHING, in the sense that GEANT3 does not
> model hadronic interactions of ions *at all*. I am surprised you see any
> hadronic interaction for everything with A>1. The latest version of FLUKA
> handles ion interactions, but this is not yet completely interafaced with
> the VMC. Fed
>
> On Thu, 18 Dec 2003, Ivana Hrivnacova wrote:
>
> >
> > Hi Paolo,
> >
> > I will only explain what does Geant3 VMC
> > when you call gMC->DefineIon(..) in your
> > VMC application class:
> >
> > gMC->DefineIon(...) adds a geant3 particle via
> > Gstpart(...) function with setting the ITRTYP code
> > (type of tracking routine) to ITRTYP=8.
> > Then this particle definition is also added to TDatabasePDG
> > (if it does not yet exist here) and mapped to the geant3
> > particle id.
> >
> > What happens next is a question for Geant3 experts.
> >
> > Regards,
> >
> > Ivana
> >
> > ==============================================================
> > e-mail: Ivana.Hrivnacova@cern.ch
> > address: Institut Physique Nucleaire, 91406 Orsay, France
> > phone: (33) 01 69 15 65 94
> > ==============================================================
> >
> > On Tue, 16 Dec 2003, paolo maestro wrote:
> >
> > > Hi,
> > > I defined in the method AddParticles of my class
> > > inheriting from TVirtualMCApplication some ions through:
> > >
> > > gMC->DefineIons("He4",2, 4, 2, 0, 3.75309);
> > > gMC->DefineIons("Li6",3, 6, 3,0 , 5.62963);
> > > gMC->DefineIons("B10",5, 10, 5,0 , 9.38272);
> > > and so on.
> > > Then I switched off the hadrons interaction in geant3
> > > by selecting the FLUKA generator.
> > > In my application I have a calorimeter
> > > preceeded by a carbon target acting as a pre-shower .
> > > I noticed that when I run with protons or nuclei as D, He up to Li6
> > > the hadronic cascades occur with a rate according to the total number of
> > > interaction
> > > lengths of my detector.
> > > But with heavier nuclei (starting from B10) the hadronic interactions
> > > seem to be switched off
> > > and nuclei pass through the calorimeter as minimum ionizing particles.
> > > The situation is even worse by using the geisha generator. Infact in
> > > this case all the nuclei behave as mips.
> > > Which is the reason of these behaviours ?
> > > Is it due to some limitation of the fluka/geisha generator inside
> > > geant3?
> > > Or do I have to do something else to run properly with ions?
> > > Thanks.
> > > Best regards
> > > Paolo
> > >
> > >
> > > **************************
> > > Paolo Maestro
> > > Universita' di Siena-INFN
> > > Phone ++39-050-2214349
> > > Fax ++39-050-2214317
> > > **************************
> > >
> > >
> > >
> >
> >
>
>
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