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Forum: Hadronic Processes
Re: Question problem with PionMinusAbsorptionAtRest (He Miao)
Date: 01 Aug, 2006
From: Vladimir IVANTCHENKO <>

On Mon, 17 Jul 2006, He Miao wrote:

> *** Discussion title: Hadronic Processes
> Email replies to must include:
>   In-Reply-To: <"/hadronprocess/538">
>   Subject: ...change this to be about your reply.
> Hi,
> I generated 100~500MeV pi- to my detector, and I found 13% of them was
> absorbed in the scintillator, through the process
> G4PionMinusAbsorptionAtRest, and created a pi0 at rest. The scintillator
> consists of C and H, with about 10cm thick. However, another process
> G4PiMinusAbsorptionAtRest will not produce secondary particles, like
> pi0s.
> I'm wondering which model is reasonable, and whether the cross section
> of PionMinusAbsorptionAtRest is right? If it is, there will be a lot of
> gammas from rest pi0s, with about 70MeV momentum, which can be observed
> in the shower counter.
> I use Geant4.8.0, QGSP, while it's the same with other hadronic packages
> or previous versions.
> He Miao


In the release 8.1 we propose as the main process of simulation of pion 
stopping provided by CHIPS subpackage. If you will start to use G4 8.1p01, 
the QGS type of PhysicsList will provide much more reliable results for 
pi- stopping.


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