Inter-comparison of Particle production (2) H. Hirayama1,2 and T. Sanami1 1KEK, High Energy Accelerator Research Organization 2Nuclear Regulation Authority

Problems for an Inter-comparison of particle production proposed for SATIF-12 Incident particle Pencil beam of protons with following energy 1 GeV, 10 GeV and 100 GeV Target materials and their sizes Targets geometry is the cylinder 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

General Tendency Comparison of neutron spectra 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 Neutron Fluence above 20 MeV Differences between code are small for 1 GeV proton. For 10 and 100 GeV protons at Al and Cu targets, differences become larger by increasing of the angle.

Future Themes Compare total cross section used at each code Compare total neutron fluence and total energy fluence at each angle and emitted from the target Comparison with experimental results Selection of experiments to be compared Others items

Revised problems for an Inter-comparison of particle production proposed for SATIF-13 Incident particle Pencil beam of protons with following energy 1 GeV, 10 GeV and 100 GeV Target materials and their sizes Targets geometry is the cylinder 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 (1) Neutron spectrum above 20 MeV in n/MeV/sr/proton at 0, 15, 30, 45, 60 ,90,120,150 degrees with angular width ±0.5 degrees. (2) Angular integral neutron spectrum above 20 MeV in n/MeV/cm2 proton (3) Energy integral neutron fluence for (1) and (2)

Summary of contributors for particle production calculation (2) Name of participants and organizations Code Data Base Physical model Norihiro MATSUDA (JAEA) and PHITS development team PHITS Original (PHITS) INCL4.6(<3GeV)+JAM(>3GeV)+GEM Koi Tatsumi (SLAC) Geant4 v10.02.p02 (use "Shielding" physics list) BERT style cascade up to 5GeV and from 4 GeV Fritof (FTF) string model Pedro Vaz, Yuriy Romanets (INST) MCNPX version 2.7.0 Default Toshiya Sanami (KEK) MARS 1516 Original MARS

Comparison of neutron fluence above 20 MeV Difference is relatively small. Al : within 96 % Cu : within 60 % Au : within 103 % Difference of total neutron energy above 20 MeV emitted from the target is within almost factor 2 between Al, Cu and Au for protons from 1 GeV to 100 GeV.

Comparison of neutron energy ｆluence above 20 MeV Difference is small. Al : within 46 % Cu : within 76 % Au : within 39 % Difference of total neutron energy above 20 MeV emitted from the target is less than 76 % between Al, Cu and Au for protons from 1 GeV to 100 GeV.

Comparison of Neutron Spectrum at 0 degree Large differences exist between codes especially for 1 GeV proton.

Comparison of angular integral neutron energy fluence above 20 MeV For 1 GeV proton, differences are relatively small except 0 degree. For 10 GeV protons, similar differences exit for all angle. For 100 GeV, differences at 0 degree are smaller than other angle.

General tendency Differences between code are small for total neutron and total neutron energy emitted from target on 1 GeV Relatively large differences exist in the comparison angular spectrum especially at 0 degree.

Future action Fluka results are desired for this intercomparison. It is desired to check models especially for angular distributions by code developers and reflect to this comparison. Experimental results are necessary for 0 degree. Other items

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