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Question NeutronHP Cross Section Warnings 

Forum: Hadronic Processes
Date: 09 Mar, 2010
From: Neoh <Neoh>

Hi,

I'm simulating beam-target experiment with deuteron beam energies below 20MeV. I used G4EmStandardPhysics and QGSP_BIC_HP as physics list. When I initialized the run, I received warnings

NeutronHP: /Elastic/ file for Z = 8, A = 18 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Elastic///CrossSection/8_17_Oxygen
NeutronHP: /Elastic/ file for Z = 6, A = 13 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Elastic///CrossSection/6_nat_Carbon
NeutronHP: /Capture file for Z = 8, A = 18 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Capture//CrossSection/8_17_Oxygen
NeutronHP: /Elastic file for Z = 8, A = 18 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Elastic//CrossSection/8_17_Oxygen
NeutronHP: /Inelastic file for Z = 8, A = 18 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Inelastic//CrossSection/8_17_Oxygen
NeutronHP: /Capture file for Z = 6, A = 13 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Capture//CrossSection/6_nat_Carbon
NeutronHP: /Elastic file for Z = 6, A = 13 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Elastic//CrossSection/6_nat_Carbon
NeutronHP: /Inelastic file for Z = 6, A = 13 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Inelastic//CrossSection/6_nat_Carbon
 ### Adding tracking cuts for neutron  TimeCut(ns)= 10000  KinEnergyCut(MeV)= 0
NeutronHP: /Capture/ file for Z = 8, A = 18 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Capture///CrossSection/8_17_Oxygen
NeutronHP: /Capture/ file for Z = 6, A = 13 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Capture///CrossSection/6_nat_Carbon

To avoid such changes, I set the environment variable G4NEUTRONHP_SKIP_MISSING_ISOTOPES and re-initialize the run:

NeutronHP: /Elastic/ file for Z = 8, A = 18 is not found and CrossSection set to 0.
NeutronHP: /Elastic/ file for Z = 6, A = 13 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Elastic///CrossSection/6_nat_Carbon
NeutronHP: /Capture file for Z = 8, A = 18 is not found and CrossSection set to 0.
NeutronHP: /Elastic file for Z = 8, A = 18 is not found and CrossSection set to 0.
NeutronHP: /Inelastic file for Z = 8, A = 18 is not found and CrossSection set to 0.
NeutronHP: /Inelastic file for Z = 1, A = 1 is not found and CrossSection set to 0.
NeutronHP: /Inelastic file for Z = 1, A = 1 is not found and CrossSection set to 0.
NeutronHP: /Capture file for Z = 6, A = 13 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Capture//CrossSection/6_nat_Carbon
NeutronHP: /Elastic file for Z = 6, A = 13 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Elastic//CrossSection/6_nat_Carbon
NeutronHP: /Inelastic file for Z = 6, A = 13 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Inelastic//CrossSection/6_nat_Carbon
 ### Adding tracking cuts for neutron  TimeCut(ns)= 10000  KinEnergyCut(MeV)= 0
NeutronHP: /Capture/ file for Z = 8, A = 18 is not found and CrossSection set to 0.
NeutronHP: /Capture/ file for Z = 6, A = 13 is not found and NeutronHP will use /home/neohys/geant4/geant4.9.3/data/G4NDL3.13/Capture///CrossSection/6_nat_Carbon

Somehow not all isotope cross-sections were set to zero. May I know why is this happening?

Neoh

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