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
> **************************
>
>
>
--
This archive was generated by hypermail 2b29 : Fri Jan 02 2004 - 02:46:51 MET