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Question Alpha-particles calorimetry at high energies (>10 Gev/n) 

Forum: Hadronic Processes
Date: 13 May, 2009
From: Nikolay Nikonov <Nikolay Nikonov>

Dear colleagues, I'm doing simulation of hadronic processes for alphas in tungsten calorimeter in wide energy range (0.2-300 GeV/n). To do it I use binary cascade model (physics list QGSP_BIC_HP). The problem that binary cascade works only up to 10 GeV/n and then I observe significant difference with real data.

Can you propose me a model, which is able to work above this energy region please? I need few alternatives to try. What about Geant4-DPMJET interface? Is it implemented already?

Nikolay.

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Idea Re: Alpha-particles calorimetry at high energies (>10 Gev/n)  by Vladimir Ivanchenko <Vladimir Ivanchenko>,   18 May, 2009
Re: Question Alpha-particles calorimetry at high energies (>10 Gev/n) (Nikolay Nikonov)
Hello Nikolay,

Probably, DPMJET is what you need, the interface was recently developed but not yet well known even inside G4. I will leave the possibility to answer how to use this interface to experts.

What would be useful is to show us the problem for high energy alpha interactions or to point to the published data.

VI

None Re: Alpha-particles calorimetry at high energies (>10 Gev/n)  by Nikolay Nikonov <Nikolay Nikonov>,   19 May, 2009
Re: Idea Re: Alpha-particles calorimetry at high energies (>10 Gev/n) (Vladimir Ivanchenko)
Hello Vladimir,

Yes, I hope that DPMJET could help here. I need just a few hints of experts to start work use this interface if it's ready.

The simulation that I'm doing is a simulation of complex detector. And tungsten calorimiter is a part of this detector. There is also anticoincidance plastic scintillatiors above calorimeter. Their goal is protect from particles, that hadronically interacts somewhere above the calorimeter or particles, that are going offside the main geometry.

To do this simulation for alpas I use QGSP_BIC_HP list

Of course, due to hadronic intercations, sometimes I have anticoincidance hitted even if I throw a particles in main geometry. So, if I define "efficiency" is a ratio of events without anticoincidance hitted to total number of events and plot this efficiency as function of partice kinetic energy, then I observe a "bump" at 10 GeV/n for alphas from 86% (<10GeV/n) to 93% (>10GeV/n). As I understood, there we have a switch from one model (INC) to another (QGSP). This bump shows that last model, seems gives me less secondaries to hit anticoincidance.

I would like to do a crosschecking BIC with DPMJET, which is valid start from 5 GeV/n. Probably DPMJET will be more precise.

Nikolay

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