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Question Warning message using QGSP_BIC_HP physics list 

Forum: Physics List
Date: 06 Jul, 2008
From: Stephen Dowdell <Stephen Dowdell>

Hi,

I'm using version 4.9.1.p01 to simulate a proton beam on a water phantom. It was suggested to me to use the QGSP_BIC_HP physics list for my simulations.

During a simulation, I get the following warning message: G4HadronElastic WARNING ekin= -1.1368684e-13 after scattering of proton p(GeV/c)= 398.56811 on proton

The final number in the warning changes each time the warning is present. Sometimes the ekin value is doubled.

It appears that after scattering the kinetic energy is for some reason negative. I'm curious if this warning could have an effect on the results of the simulation. The magnitude is quite small so I'm not sure how significant the effect will be. Is there a way I can ensure that these warnings no longer happen?

Many thanks, Stephen

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1 Idea: Re: Warning message using QGSP_BIC_HP physics list   (Vladimir Ivanchenko - 07 Jul, 2008)
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