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Forum: Event and Track Management
Re: Question Force interaction in a volume (Christophe Hugon)
Date: 14 Jul, 2015
From: Marc Verderi <Marc Verderi>

Hello,

Forcing an interaction is doable since 10.0. Please have a look at 
example/extended/biasing/GB02 . You may also scale the cross-section by 
a large factor (in what case, please see GB01).

Likely this example GB02, mimicing the force collision scheme of MCNP, 
provides more than you need (ie : it has a force collision part + a 
force uncollided one, to cover all cases, but you may need only the 
collision part). Adapting this example to better fit your need is 
doable. Please let us know if you would be interested by this.

Also, Geant4 does not have neutrino interactions yet. Do you provide 
your own ?

Marc


On 07/14/2015 05:13 PM, Christophe Hugon wrote:
> *** Discussion title: Event and Track Management
>
> Hello, I'm simulating a neutrino telescope. Therefore it is in water in
> which you have weak interaction of neutrino. But the problem is that the
> cross section is extremely low, thus I would have to generate a
> tremendous number of neutrino to get only one event. My question is: Is
> it possible to force the interaction of the neutrinos in the target
> material (sea water)? I read in the forum that it was in development,
> but not yet available.
>
> The way I though was: Generate a neutrino in the target material and
> force to do the next step discrete process interaction immediately, i.e.
> without propagation (which could be light years). Is there a (maybe
> nasty but) simple way such as putting the transportation speed at 0?
>
> Thank you for your help
>
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