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Forum: Hadronic Processes
Re: Question Energy Conservation violation warning while using INCLXX physics list (Dipak Rimal)
Re: None Re: Energy Conservation violation warning while using INCLXX physics list (Davide Mancusi)
Date: Apr 25, 17:44
From: Yuan Hu <Yuan Hu>

Hello Davide,

I am trying to use Geant4 to simulate D(40MeV)-Li reaction and the neutron they produced react with other materials. And I am using the INCL++ right now. Is it a suitable physics list for me?

Thanks.

Yuan Hu

On Mon, 15 Dec 2014 22:29:12 GMT, Davide Mancusi wrote:

> 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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