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Inter-comparison of Particle production

Inter-comparison of Particle production. H. Hirayama and T. Sanami KEK, High Energy Accelerator Research Organization. Proposal new inter-comparison at SATIF-11. From “ Inter-comparison of Medium-Energy Neutron Attenuation in Iron and Concrete (8) ” at SATIF-10

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Inter-comparison of Particle production

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  1. Inter-comparison of Particle production H. Hirayama and T. Sanami KEK, High Energy Accelerator Research Organization

  2. Proposal new inter-comparison at SATIF-11 • From “Inter-comparison of Medium-Energy Neutron Attenuation in Iron and Concrete (8)” at SATIF-10 • There were large difference in neutron spectrum between code at 4m inside iron • To know the reason of this difference, new inter-comparison was proposed • Comparison of neutron production by high energy proton • Comparison of angular neutron spectrum at various angle • Compare between code+model • To see difference between code and model used

  3. Results presented at SATIF-10

  4. Problems for an Inter-comparison of particle production • Incident particle • Pencil beam of protons with following energy • 1 GeV, 10 GeV and 100 GeV • Target materials and their sizes • Targets geometry is thecylinder • Source protons incident on the center of the cylinder bottom • Target detector distance from the center of the cylinder is 500cm • Al : length 40cm, diameter 4.0cm and density 2.7g/cm3 • Cu : length 16cm, diameter 1.6cm and density 8.63 g/cm3 • Au : length 10cm, diameter 1.0cm and density 19.3 g/cm3 • Quantities to be calculated • Neutron spectrum above 20 MeV in n/MeV/sr/proton • at 15, 30, 45, 60 ,90,120,150 degrees with angular width ±0.5 degrees

  5. Summary of contributors forparticle production calculation

  6. Comparison of Neutron Spectrum

  7. MCNPX larger than others. Shape of FLUKA is different from others.

  8. MCNPX and Geant4 Smaller than others above 1GeV.

  9. FLUKA 2011 drops around 400MeV MCNPX and Geant4 Smaller than others above 1GeV.

  10. FLUKA 2011 drops around 350MeV MCNPX and Geant4 Smaller than others above 1GeV.

  11. FLUKA 2011 drops around 400MeV MARS larger than others above 400MeV

  12. FLUKA 2011 drops around 400MeV MARS larger than others above 400MeV

  13. FLUKA 2011 drops around 350MeV MCNPX and Geant4 Smaller than others above 500MeV.

  14. General Tendency • There are large differences between codes in this simple calculation. • Reflect particle production model used • Relations between codes are different on targets, proton energies and angles. • Comparison of MARS with different model show the dependence of particle production model used. • It is recommended to find the reason of difference between the 2 results of FLUKA.

  15. Comparison of Neutron Fluence above 20 MeV

  16. Differences between code become larger at large angle.

  17. Differences between code become larger at large angle. MCNPX results are larger and PHITS results are smaller than others.

  18. Differences between code become larger at large angle.

  19. Differences between code become larger at large angle. MCNPX results are larger and PHITS results are smaller than others.

  20. MCNPX results are larger and MARS results are smaller than others.

  21. Geant4 results are larger and MARS results are smaller than others.

  22. General tendency • Differences between code are small for 1 GeV proton. • For 10 and 100 GeV protons, differences become larger by increasing of the angle. • It is recommended to calculate total neutron fluence and energy fluence leaves from the target at each angle together with neutron spectrum.

  23. Future Themes • Compare total cross section used at each code • Compare total neutron fluence and total energy fluenceemitted from the target • Comparison with experimetntalresults • Selection of experiments to be compared • Others items

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