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Current status of Geant4 Shielding Calculations

Current status of Geant4 Shielding Calculations. From T. Koi’s presentations before and after SATIF-8. Changes. Run much more statistics (x100) Use Japanese Evaluated Nuclear Data Library (JENDL) for elastic, inelastic High Energy Files (2004)

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Current status of Geant4 Shielding Calculations

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  1. Current status of Geant4 Shielding Calculations From T. Koi’s presentations before and after SATIF-8

  2. Changes • Run much more statistics (x100) • Use Japanese Evaluated Nuclear Data Library (JENDL) for elastic, inelastic • High Energy Files (2004) • Neutron- and proton-induced reaction data up to 3 GeV for 66 nuclides. • New data available for iron, concrete, brass • Use improved elastic final state generation

  3. Benchmarking

  4. Improved Result

  5. Benchmarking

  6. Improved Result

  7. neutron distribution inside iron from secondary neutrons emitted to 90 degrees from an iron target with 1 GeV protons Result of Geant4 is much lower than others Results of Geant4 Blue Solid Line

  8. Improved results neutron distribution inside iron from secondary neutrons emitted to 90 degrees from an iron target with 1 GeV protons

  9. Iron Neutron Attenuation Lengths Concrete

  10. Summary • Using new JENDL cross sections and final states increases neutron flux dramatically • Higher statistics also raises flux from original value • With these modifications, Geant4 prediction is much closer to that of other codes • Still about one order of magnitude scatter among other simulation codes.

  11. Data • New data at 1 GeV (S. Rokni) • Alex Howard pointed out data at other energies • TIARA shielding exp • LHC, SLAC beam dump • TARC

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