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Question p-bar annihilation with hydrogen simulated by CHIPS 

Keywords: CHIPS, annihilation
Forum: Hadronic Processes
Date: 31 Dec, 2006
From: ZHANG <zh.zhang@fz-juelich.de>

Dear Folks,

First of all - happy new year.

Second, I simulate p-bar annihilation with hydrogen by GEANT4-07-00-cand-03 and CHIPS.

The following is an example from simulation.

********************************************************************************
* G4Track Information:   Particle = anti_proton,   Track ID = 1,   Parent ID = 0
********************************************************************************

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng      Process
    0      0 fm      0 fm      0 fm   38.9 keV     0 eV      0 fm      0 fm       initStep
    1    1.7 cm  -6.01 mm  -7.78 mm   38.9 keV7.22e-11 eV   1.96 cm   1.96 cm     Transportation
    2    1.7 cm  -6.01 mm  -7.79 mm      0 eV   38.9 keV  2.21 mum  1.96 cm       hIoni
    3    1.7 cm  -6.01 mm  -7.79 mm      0 eV      0 eV      0 fm   1.96 cm       CHIPSNuclearAbsorptionAtRest
    :----- List of 2ndaries - #SpawnInStep=  5(Rest= 5,Along= 0,Post= 0), #SpawnTotal=  5 ---------------
    :    1.7 cm  -6.01 mm  -7.79 mm    114 MeV       pi+
    :    1.7 cm  -6.01 mm  -7.79 mm    135 MeV       pi-
    :    1.7 cm  -6.01 mm  -7.79 mm    281 MeV       pi0
    :    1.7 cm  -6.01 mm  -7.79 mm    368 MeV       pi0
    :    1.7 cm  -6.01 mm  -7.79 mm    294 MeV       pi0
    :----------------------------------------------------------------- EndOf2ndaries Info ---------------

But there is an error messenger in the output:

---Warning---G4QEnv::Const:a#ofINPHadr=1,tPDG=90000000

or:

---Warning---G4QEnv::Const:a#ofINPHadr=2,tPDG=90000000

......

I checked the source code of G4QEnviroment, that means no projectile or target. When I change the target to He, Be, Au..., the error messenger disappeared. Do you have any idea where I did wrong? Why did I got secondary particles even if no projectile or target? Is the results of secondary partiles resonable that I can use them?

Thanks a lot in advance.

ZHANG

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