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Forum: Hadronic Processes
Re: Question Energy Conservation violation warning while using INCLXX physics list (Dipak Rimal)
Date: 15 Dec, 2014
From: Davide Mancusi <Davide Mancusi>

Hello Dipak,

On Mon, 15 Dec 2014 19:27:49 GMT, Dipak Rimal wrote:

> Hello G4 experts I am trying to use INCLXX physics to simulate
> interaction of 1 GeV proton on Hg target. I am getting frequent energy
> conservation violation warnings such as:
> 
> [INCL++] Warning: energy conservation violated by 6.73985 MeV in
> 47.8781-MeV neutron + Be9 inelastic reaction, in direct kinematics. Will
> resample. [INCL++] Warning: maximum number of tries exceeded for the
> proposed 5.14186-MeV proton + Hg201 inelastic reaction, in direct
> kinematics.

These warnings are harmless. The first one is typically generated in corner cases of reactions on light nuclei. Note that events violating energy conservation are resampled, so your calculation will always satisfy energy conservation. The second warning is emitted because Geant4 requested an inelastic event for the mentioned projectile-target combination (because the parametrized proton reaction cross section does not vanish), but INCL++ cannot generate one (because e.g. the proton is below INCL++'s internal Coulomb barrier).

Both cases are corner cases. Similar things happen in all models; INCL++ is just a more chatty about it. You should not worry too much about them, unless you are specifically interested in e.g. sub-barrier reactions.

> The simulation even quits sometimes after exceeding maximum number of
> tries. I tried the latest release of GEANT4 ( 10.1 ) too but I still get
> same warning messages.

If the simulation quits or crashes unexpectedly, it cannot be due to these warnings.

> This happens for low energies interactions. Since I am working on low
> energy regime, I am a bit concerned about these warnings. Can you please
> comment on the severity of these warnings and possible resolutions?

If you are interested in a precise description of reactions below ~50 MeV, then intranuclear-cascade models are not your best bet. How low is your low energy?

Cheers, Davide

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1 None: Re: Energy Conservation violation warning while using INCLXX physics list   (Dipak Rimal - 18 Dec, 2014)
1 Idea: Re: Energy Conservation violation warning while using INCLXX physics list   (Vladimir Ivanchenko - 18 Dec, 2014)
2 None: Re: Energy Conservation violation warning while using INCLXX physics list   (Yuan Hu - Apr 25, 17:44)
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