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

2. 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

3. 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.

4. 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

5. 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)

6. 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

7. 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.

11. 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.

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

25. 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.

35. 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.

36. 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

37. Supplement slides