4th International Summer School

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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,
Ondrej Svoboda, Vladimír Wagner for the Energy
plus Transmutation collaboration
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Introduction

• Experiments are carried out at JINR to study
  spallation
• p Pb gt 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
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Phasotron experiment - bare Pb target
Lead target Beam proton 660 MeV
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Energy plus Transmutation Set-up

• 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
Maxime ODEN - École des Mines de Nantes - Nuclear
Physics Institute of ASCR
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Energy plus Transmutation Set-up
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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)

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MCNPX Simulation

• Ratio between experiment and MCNPX simulation
  results

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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

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FLUKA Simulation

• neutrons fluence
• Phasotron experiment with proton beam (660MeV)

MCNPX
FLUKA
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FLUKA Simulation Energy plus Transmutation
Side view
Front view
Radial detectors (gold foils)
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FLUKA Simulation

• Ratio between experiment and FLUKA simulation
  results (manual mutliplication)

ratio
Radial distance (cm)
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FLUKA Simulation II

• Ratio between experiment and FLUKA simulation
  results with RESNUCLEi scoring card

ratio
Radial distance (cm)
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Conclusion

• FLUKA results checked by comparison with MNCPX
• FLUKA and MCNPX are expected to give similar
  results

Thank you for your attention
Maxime ODEN - École des Mines de Nantes - Nuclear
Physics Institute of ASCR