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The JRC Laboratory of Neutron Physics Peter Rullhusen peter.rullhusen@ec.europa.eu

The JRC Laboratory of Neutron Physics Peter Rullhusen peter.rullhusen@ec.europa.eu. Nuclear activities at IRMM Unit for Isotopic Measurements safeguards radionuclide metrology nuclear targets preparation Unit for Neutron Measurements neutron-induced reactions

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The JRC Laboratory of Neutron Physics Peter Rullhusen peter.rullhusen@ec.europa.eu

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  1. The JRC Laboratory ofNeutron PhysicsPeter Rullhusenpeter.rullhusen@ec.europa.eu

  2. Nuclear activities at IRMM • Unit for Isotopic Measurements safeguardsradionuclide metrologynuclear targets preparation • Unit for Neutron Measurements neutron-induced reactions cross sections, resonance parametersfission fragmentsfission neutron multiplicities and spectrastandard cross sections modelling of the fission processtechnical developments: data acquisition using fast signal digitisers Frisch-gridded ionisation chambers, time-projection chambers detector arrays for n, g measurements

  3. direct actions in FP7 - Euratom • Basic Research in Nuclear Physics and Neutron Data Standards • Standard cross-sections • Theory / modelling • Exploratory research, technical developments • Neutron Data for Waste Transmutation andSafety of Different Reactor Systems • transmutation of long-lived radioactive waste • Accelerator-driven systems • U-Pu and Th-U fuel cycles • Generation IV Nuclear Energy Systems

  4. Th-U fuel cycle: 232Th(n,g) measurements in the Resolved Resonance Region: IAEA-CRP F4.10.20 “Evaluated Data for the Th-U Fuel Cycle”

  5. The Geel Linear Accelerator GELINA n measurements with very high energy resolution using time-of-flight technique

  6. neutron production target: depleted uranium, Hg cooled

  7. GELINA - Main operating modes

  8. New detector arrays (n,n’g) detector setup: 8 x HPGe @ 110° and 150° Digitized acquisition (n,g) detector setup: 10 x C6D6 @ 60° and 120° W/4p = 0.8 Digitized acquisition

  9. 7 MV Van de Graaff accelerator • Belt-charged CN Van de Graaff from High Voltage Engineering (installed 1978, new accelerator tube installed 1999) • Radio frequency ion source. ECR ion source to be installed late 2007 • Proton-, deuteron- and alpha beams • DC and pulsed mode • 10-50 mA DC beam current dependent on ion and beam line • Fast pulsing, fwhm 2.0 ns at 2.5 MHz, 1.25 MHz or 0.625 MHz, and 0.1 mA average current • Slow pulsing, minimum width of 10 ms, continuously adjustable frequency up to 5 kHz. • ~108 neutrons/s/cm2, 1 cm from target (DC mode) • 6 beam lines (on 2 levels) • Operated 24 hours/day, 7 days/week in periods of 4 weeks

  10. Neutron field production 7Li(p,n)7Be En: 0 - 5.3 MeV T(p,n)3He En: 0 - 6.2 MeV D(d,n)3He En: 1.8 - 10.1 MeV T(d,n)4He En: 12.1 - 24.1 MeV • nuclear reaction, • neutron emission angle, • ion energy. 0 deg. 20 cm 40 deg. 80 deg.

  11. Neutron field characteristics *Neutron fluence in 74 deg. Angle.

  12. Activation cross-sections • shielding materials:activation • structural materials:radiation damage charged-part. prod. • modelling:adapt parameters

  13. 16O(n,)13C 30% uncertainty  100 pcm in keff for UOX,MOX fuel accounts for 25% of total He production

  14. NEPTUNE: New pulsed and tunable neutron source beam chopper at VdG for measurements in the ms to ms range

  15. VERDI: Velocity for direct particle identification fission fragment properties: Z, A, Ekin  identification of pre-cursors for delayed neutron emission two-arm spectrometer 16 fission fragment detectors FP n

  16. NUDAME Transnational Access to IRMM neutron data facilities • FP6 EURATOM programme • 3000 supplementary data-taking hours for external users • 18 experiments approved by PAC, April 1, 2005 – March 31, 2008

  17. EUFRAT: new TA proposal for Euratom FP7 programme • positive evaluation  contract negotiations • 4 years (2008 – 2012) • 5600 supplementary data-taking hours for external users • start-up probably April 2008 if you are interested: check out our website http://www.irmm.jrc.be

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