Crossection issue

Particles, Track, Event, Run and Biasing
1

Hello, In my runs I am getting a lot of missing cros-ssection issues mentioned below, is this normal?

-Thanks

@@@ G4ParticleHPInelastic instantiated for particle neutron data directory variable is G4NEUTRONHPDATA pointing to /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6/Inelastic
@@@ G4ParticleHPInelasticData instantiated for particle neutron data directory variable is G4NEUTRONHPDATA pointing to /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6
NeutronHP: /Capture file for Z = 6, A = 12 is not found and NeutronHP will use /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6/Capture/CrossSection/6_nat_Carbon
NeutronHP: /Elastic file for Z = 6, A = 12 is not found and NeutronHP will use /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6/Elastic/CrossSection/6_nat_Carbon
NeutronHP: /Inelastic file for Z = 6, A = 12 is not found and NeutronHP will use /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6/Inelastic/CrossSection/6_nat_Carbon
NeutronHP: /Capture file for Z = 6, A = 12 is not found and NeutronHP will use /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6/Capture/CrossSection/6_nat_Carbon
NeutronHP: /Elastic file for Z = 6, A = 12 is not found and NeutronHP will use /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6/Elastic/CrossSection/6_nat_Carbon
NeutronHP: /Inelastic file for Z = 6, A = 12 is not found and NeutronHP will use /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6/Inelastic/CrossSection/6_nat_Carbon
NeutronHP: /Capture file for Z = 6, A = 12 is not found and NeutronHP will use /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6/Capture/CrossSection/6_nat_Carbon
NeutronHP: /Elastic file for Z = 6, A = 12 is not found and NeutronHP will use /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6/Elastic/CrossSection/6_nat_Carbon
NeutronHP: /Inelastic file for Z = 6, A = 12 is not found and NeutronHP will use /homes/sanchitsharma/Geant4/Install_M/share/Geant4-10.6.0/data/G4NDL4.6/Inelastic/CrossSection/6_nat_Carbon
2

That just means that the cross sections files for those nuclei aren’t in the G4NDL database. You can use other sources for your NeutronHP data, for example a group in Spain has put many libraries (ENDF, JEFF) into a format geant4 can use here:
https://www-nds.iaea.org/geant4/

From there you just have to point your G4NEUTRONHPDATA environmental variable to the location of those files (check your geant4make that you source at the start of every simulation for how to do that).