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Forum: Hadronic Processes
Date: 23 Mar, 2011
From: Gianfranco Gargano <Gianfranco Gargano>

Hy, I'm trying to simulate a 150 MeV proton in a water cube. There's a strange effect: the sum of all energies deposed in the water cube is not 150 MeV. I have considered the energy which escape from the water cube (neutrons or gammas), but anyway seems that in the last proton interaction near 15 MeV disappear. I'm using an energy cut value of 0.01mm and no step max limitation. This is the physics list I'm using:

>   AddTransportation();
>   G4DecayPhysics* DP = new G4DecayPhysics();
>   DP->ConstructProcess();
>   G4EmStandardPhysics_option3* EmSP = new G4EmStandardPhysics_option3(1);
>   EmSP->ConstructProcess();
>   G4EmExtraPhysics* EmEP = new G4EmExtraPhysics();
>   EmEP->ConstructProcess();
>   G4HadronElasticPhysics* HEP = new G4HadronElasticPhysics();
>   HEP->ConstructProcess();
>   G4QStoppingPhysics* QSP = new G4QStoppingPhysics();
>   QSP->ConstructProcess();
>   G4IonBinaryCascadePhysics* IBCP = new G4IonBinaryCascadePhysics();
>   IBCP->ConstructProcess();
>   G4NeutronTrackingCut* NTC = new G4NeutronTrackingCut();
>   NTC->ConstructProcess();
>   HadronPhysicsQGSP_BIC* HPQGSP = new HadronPhysicsQGSP_BIC();
>   HPQGSP->ConstructProcess();

The problem is energy dependent (at energy below 100 MeV the energy is conserved) and seems to be connected with the use of: 'HadronPhysicsQGSP_BIC'. Someone have suggestion?

As you can see in the attached file at proton interaction #424 it loose 71.6 MeV, and if you look forward you can see a N15 carrying 1.24 MeV, a gamma carrying 6.15 MeV (it exit from the 'world' carrying 2 MeV), a proton carrying 3.11 MeV and another proton carrying 49 MeV. The sum of this energies is near 59 MeV. But it should be 71.6 MeV... why?


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1 Idea: Re: Energy Conservation in Hadronic Inelastic Process   (Vladimir Ivanchenko - 23 Mar, 2011)
(_ Question: Re: Energy Conservation in Hadronic Inelastic Process   (Gianfranco Gargano - 23 Mar, 2011)
(_ Idea: Re: Energy Conservation in Hadronic Inelastic Process   (Vladimir Ivanchenko - 23 Mar, 2011)
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