4th International Summer School« Nuclear Physics Methods and Accelerators in Biology and Medicine »
Monte-Carlo simulations :FLUKA vs. MCNPX
Maxime ODEN – École des Mines de Nantes (France)
Spectroscopy dpt., Nuclear Physics Institute of ASCR
Antonín Krása, Mitja Majerle, Ondřej Svoboda, Vladimír Wagner
for the Energy plus Transmutation Energy plus Transmutation collaboration
Introduction Experiments are carried out at JINR to study
spallation
p + Pb => spallation reaction
Detection of neutron with to activation detectors (Au, Al, Bi).
Activation foils activities are measured thanks to a germanium detector.
Maxime ODEN - École des Mines de Nantes - Nuclear Physics Institute of ASCR
Phasotron experiment - bare Pb target
Lead targetBeam : proton 660 MeV
Energy plus Transmutation Set-up
Maxime ODEN - École des Mines de Nantes - Nuclear Physics Institute of ASCR
• target: Pb (28.66 kg) • blanket: U (206.4 kg)• shielding: Cd + (CH2)n
Beam :
proton 0.7/1/ 1.5 /2 GeV
deuteron 1.6 / 2.52 GeV
Energy plus Transmutation Set-up
MCNPX Simulation
The obtained experimental data are used to check prediction from MCNPX (a computer simulation code based on Monte Carlo method)
MCNPX can calculate neutrons fluence where the detectors are set up
Neutron fluence multiplied by cross-sections for activation reaction give simulated activation results
Results compared to experimental results show discrepancies at higher energies (1.5 GeV and 2 GeV)
MCNPX Simulation Ratio between experiment and MCNPX
simulation results :
0
1
2
3
4
5
0 5 10 15
Radial distance [cm]
Bex
p/B
sim
Au-196Au-194Au-193Au-192Au-191
FLUKA Simulation
Verify experiments with FLUKA code: Spectrum in phasotron experiment Reaction rate in radial detectors
Two ways to calculate activation results: Multiplication with cross-sections RESNUCLEi function
FLUKA Simulation neutrons fluence Phasotron experiment with proton beam (660MeV)
MCNPX
FLUKA
FLUKA SimulationEnergy plus Transmutation
Front view Side view
Radial detectors(gold foils)
1,0
2,0
3,0
4,0
5,0
2,5 4,5 6,5 8,5 10,5 12,5
Au-196Au-194Au-193Au-192Au-191
FLUKA Simulation Ratio between experiment and FLUKA simulation results (manual
mutliplication):
ratio
Radial distance (cm)
1,0
2,0
3,0
4,0
5,0
6,0
7,0
2 4 6 8 10 12 14
Au-196Au-194Au-193Au-192Au-191
FLUKA Simulation II Ratio between experiment and FLUKA simulation results with
RESNUCLEi scoring card:
ratio
Radial distance (cm)
Conclusion FLUKA results checked by comparison with
MNCPX
FLUKA and MCNPX are expected to give similar results
Maxime ODEN - École des Mines de Nantes - Nuclear Physics Institute of ASCR
Thank you for your attention
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