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Neutron Spectrometry with H e -3 proportional counters

Neutron Spectrometry with H e -3 proportional counters. M. Manolopoulou 1 , M. Fragopoulou 1 , S. Stoulos 1 , E. Vagena 1 , W. Westmeier 2 , M. Zamani 1 1 School of Physics, Aristotle University of Thessaloniki, Hellas 2 Philipps-Universität, 35032 Marburg, Germany. Outline .

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Neutron Spectrometry with H e -3 proportional counters

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  1. Neutron Spectrometry with He-3 proportional counters M. Manolopoulou1, M. Fragopoulou1, S. Stoulos1, E. Vagena1, W. Westmeier2, M. Zamani1 1School of Physics, Aristotle University of Thessaloniki, Hellas 2Philipps-Universität, 35032 Marburg, Germany

  2. Outline Operational characteristics of the counter Energy Calibration Efficiency Calibration Simulation with Geant4 and comparison with the experimental results Neutron spectrum unfolding example RAD2012

  3. Thermal – epithermal peak (764 keV) He-3 counter spectra Fullenergy peak Recoil peak 3He(n,elastic) 0.75*En 3He(n,p)3H Q=764 keV 3He(n,d)2H Q=-3.3 MeV RAD2012

  4. Counter characteristics • Gas Pressure 6 Atm • Gas Mixture 3He 65% Kr 33% CO2 2% • Diameter 5 cm • Effect. length 15 cm • Cathode SS304, 0.9 mm • Anode Tungsten, 25 μm Cd cover 1.2 mm RAD2012

  5. Irradiations at the Institute of Nuclear Physics, Demokritos, Athens Proton Beam: 2.0 – 5.0 MeV 7Li(p, n)7Be En = 0.23 – 3.3 MeV Deuteron Beam: 1.4–7.8 MeV 2H(d, n)3He En = 3.7 – 10.7 MeV Full energy peak NIM A 562(2006) 371 “Studies on the response of He-3 and He-4 proportional counters to monoenergetic fast neutrons“ RAD2012

  6. Energy calibration of Recoil peak RAD2012

  7. Comparison of energy calibration for Full-energy and Recoil peaks RAD2012

  8. Pulse height loss of recoil events RAD2012

  9. Pulse height loss of recoil events NIM A 618 (2010) 284-293. “Non linearity of recoil pulse height events in He-3 tubes” RAD2012

  10. Irradiations at the PTB calibrated neutron field RAD2012

  11. Pulse height distributions obtained with He-3 counter 2.5 MeV 565 keV 1.2 MeV RAD2012

  12. Geant4 simulation results RAD2012

  13. Simulation results folded with resolution function RAD2012

  14. Experimental and simulated spectra RAD2012

  15. Calculated neutron fluence during irradiation of the extended natU/Pb-assembly with 1.6 GeV deuterons RAD2012

  16. Comparison of experimental and simulated spectra RAD2012

  17. Neutron yield energy distribution RAD2012

  18. Conclusions Thank you for your attention He-3 proportional counter response can be simulated with Geant4 provided that besides the spectrometry functions, recombination coefficient of 3He recoiling nucleus will be determined experimentally. Using the calculated response with Geant4, neutron energy distribution of a neutron field in the MeV energy region can be determined for the energy range ~ 0.2 – 7 MeV. No prior knowledge of neutron energy distribution is required. VARNA 2011

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