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bug in geant4 9.2 ? helium counter, energies of secondaries.  

Forum: Hadronic Processes
Date: 29 Jan, 2009
From: Marcin Kasztelan <Marcin Kasztelan>

Hello. Probably I found a bug in new geant4-09-02 (19-December-2008) ************************************************************* My simulations: I simulate neutron helium counters. In the process n+3He -> p + tritium + 764 keV It worked ok to version 9.1 of geant but now i have wrong energies of secondaries in that reaction. Off course I use the same source code of my program. ------------------------------------------- My material: Material: Licznik_gas density: 2.236 mg/cm3 RadL: 62.954 m Nucl.Int.Length: 468.405 m Imean: 180.463 eV temperature: 294.00 K pressure: 5.50 atm ---> Element: Hel3 (He3) Z = 2.0 N = 3.0 A = 3.02 g/mole ---> Isotope: He3 Z = 2 N = 3 A = 3.02 g/mole abundance: 100.00 % ElmMassFraction: 22.89 % ElmAbundance 89.19 % ---> Element: Krypton (Kr) Z = 36.0 N = 83.8 A = 83.80 g/mole ElmMassFraction: 77.11 % ElmAbundance 10.81 % -------------------------------------------- And some output from geant4 9.1: ********* BEGIN ****************** ************************************************************* Geant4 version Name: geant4-09-01-patch-03 (12-September-2008) Copyright : Geant4 Collaboration Reference : NIM A 506 (2003), 250-303 WWW : http://cern.ch/geant4 ************************************************************* <<< Geant4 Physics List engine packaging library: PACK 5.4 <<< Geant4 Physics List simulation engine: LHEP_PRECO_HP 3.2 ********************************************************************************************************* * G4Track Information: Particle = neutron, Track ID = 1, Parent ID = 0 ********************************************************************************************************* Step# X(mm) Y(mm) Z(mm) KinE(MeV) dE(MeV) StepLeng TrackLeng NextVolume ProcName 0 -115 350 0 2.4e-08 0 0 0 World initStep 1 -100 372 -87.5 2.4e-08 0 91.4 91.4 Licznik_ob Transportation 2 -100 372 -88.5 2.4e-08 0 1.04 92.5 CENTER Transportation 3 -98.8 374 -97.1 0 0 9.02 101 CENTER NeutronInelastic :----- List of 2ndaries - #SpawnInStep= 2(Rest= 0,Along= 0,Post= 2), #SpawnTotal= 2 --------------- : -98.8 374 -97.1 0.573 proton : -98.8 374 -97.1 0.191 triton :----------------------------------------------------------------- EndOf2ndaries Info --------------- ********************************************************************************************************* * G4Track Information: Particle = triton, Track ID = 3, Parent ID = 1 ********************************************************************************************************* Step# X(mm) Y(mm) Z(mm) KinE(MeV) dE(MeV) StepLeng TrackLeng NextVolume ProcName 0 -98.8 374 -97.1 0.191 0 0 0 CENTER initStep 1 -99 374 -98.6 0.0212 0.17 1.79 1.79 CENTER hIoni 2 -98.9 373 -99.2 0 0.0212 0.779 2.57 CENTER hIoni ********************************************************************************************************* * G4Track Information: Particle = proton, Track ID = 2, Parent ID = 1 ********************************************************************************************************* Step# X(mm) Y(mm) Z(mm) KinE(MeV) dE(MeV) StepLeng TrackLeng NextVolume ProcName 0 -98.8 374 -97.1 0.573 0 0 0 CENTER initStep 1 -98.7 374 -97.1 0.568 0.00345 0.0525 0.0525 CENTER hIoni :----- List of 2ndaries - #SpawnInStep= 1(Rest= 0,Along= 0,Post= 1), #SpawnTotal= 1 --------------- : -98.7 374 -97.1 0.00102 e- :----------------------------------------------------------------- EndOf2ndaries Info --------------- ********* END ****************** and output from newest geant4-09-02 (19-December-2008) ********* BEGIN ****************** ********************************************************************************************************* * G4Track Information: Particle = neutron, Track ID = 1, Parent ID = 0 ********************************************************************************************************* Step# X(mm) Y(mm) Z(mm) KinE(MeV) dE(MeV) StepLeng TrackLeng NextVolume ProcName 24 -159 328 -124 1.08e-08 0 0 591 grafit2 initStep 25 -125 319 -104 1.08e-08 0 40.7 632 World Transportation 26 -112 315 -95.3 1.08e-08 0 16.2 648 Licznik_ob Transportation 27 -110 315 -94.3 1.08e-08 0 1.91 650 CENTER Transportation 28 -105 313 -91.5 0 0 5.45 655 CENTER NeutronInelastic :----- List of 2ndaries - #SpawnInStep= 2(Rest= 0,Along= 0,Post= 2), #SpawnTotal= 2 --------------- : -105 313 -91.5 0.954 proton : -105 313 -91.5 0.319 triton :----------------------------------------------------------------- EndOf2ndaries Info --------------- ********************************************************************************************************* * G4Track Information: Particle = triton, Track ID = 22, Parent ID = 1 ********************************************************************************************************* Step# X(mm) Y(mm) Z(mm) KinE(MeV) dE(MeV) StepLeng TrackLeng NextVolume ProcName 0 -105 313 -91.5 0.319 0 0 0 CENTER initStep 1 -105 312 -91.1 0.132 0.187 2.09 2.09 CENTER hIoni 2 -104 310 -90.8 0.044 0.0881 1.61 3.7 CENTER hIoni 3 -104 309 -90.8 0 0.044 1.11 4.81 CENTER hIoni ********************************************************************************************************* * G4Track Information: Particle = proton, Track ID = 21, Parent ID = 1 ********************************************************************************************************* Step# X(mm) Y(mm) Z(mm) KinE(MeV) dE(MeV) StepLeng TrackLeng NextVolume ProcName 0 -105 313 -91.5 0.954 0 0 0 CENTER initStep 1 -105 314 -91.5 0.95 0.00246 0.1 0.1 CENTER hIoni :----- List of 2ndaries - #SpawnInStep= 1(Rest= 0,Along= 0,Post= 1), #SpawnTotal= 1 --------------- : -105 314 -91.5 0.00198 e- :----------------------------------------------------------------- EndOf2ndaries Info --------------- ********* END ****************** As we see a secondaries have wrong energies: proton 0.954 MeV - should have 0.573 MeV tritium 0.319 MeV - should have 0.191 MeV Can somebody help me with that? Greetings Marcin Kasztelan --------------------------------------------------------------------

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Re: bug in geant4 9.2 ? helium counter, energies of secondaries.   by Koi, Tatsumi <Koi, Tatsumi>,   06 Feb, 2009 Re: bug in geant4 9.2 ? helium counter, energies of secondaries. (Marcin Kasztelan) Hi Marcin, Thank you for reporting this problem. The reaction(n-3He->p+T) Q value from Geant4 nuclear masses become 1273keV. If we use masses of AME2003, then the Q value becomes your value 763keV. I did not expect this level difference between them. The reason is clear, however more investigation required for fix. Does some one do full comparison nuclear mass (or atomic mass) of Geant4 to AME2003? Tatsumi 1 Re: bug in geant4 9.2 ? helium counter, energies of secondaries.   (Koi, Tatsumi - 05 Mar, 2009) Re: bug in geant4 9.2 ? helium counter, energies of secondaries.   (Marcin Kasztelan - 05 Mar, 2009)

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