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Träfflista för sökning "WFRF:(Lecolley Francois René) "

Sökning: WFRF:(Lecolley Francois René)

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1.
  • Bevilacqua, Riccardo, 1974-, et al. (författare)
  • Light-ion production in the interaction of 175 MeV neutrons with iron and bismuth
  • 2011
  • Ingår i: Journal of Korean Physical Society : Proceedings of the International Conference on Nuclear Data for Science and Technology.
  • Konferensbidrag (refereegranskat)abstract
    • <p>We have measured double-differential (angle and energy) cross sections for light-ion (p, d, t, <sup>3</sup>He and α) production in the interaction of quasi-monoenergetic 175 MeV neutrons with iron and bismuth. Measurements have been performed at the The Svedberg Laboratory, Uppsala (Sweden), using the Medley setup which allows low-energy thresholds and wide energy and angular ranges. Medley is a spectrometer system consisting of eight three-element telescopes placed at angles from 20◦ to 160◦, in steps of 20◦. Each telescope is composed of two silicon surface barrier detectors and a CsI(Tl) scintillator, to perform particle identification,fully stop the produced light-ions and measure their kinetic energy. The time-of-flight was used to reduce the contribution from the low energy tail in the accepted incident neutron spectrum. We report double-differential production cross sections for protons, deuterons, tritons, <sup>3</sup>He and α particles and compare them with model calculations with TALYS-1.2.</p>
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2.
  • Bevilacqua, Riccardo, 1974-, et al. (författare)
  • Medley spectrometer for ligh ions in neutron induced reactions at 175 MeV
  • 2011
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. - 0168-9002 .- 1872-9576. ; 646:1, s. 100-107
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We have upgraded the Medley spectrometer to measure neutron-induced double differential cross-sections for light-ion production, with neutron energies up to 175 MeV. Measurements were performed at the quasi-monoenergetic neutron beam line at the The Svedberg Laboratory, in Uppsala (Sweden). Medley is a spectrometer system composed of eight three-element telescope detectors; Delta E-E technique is used for particle identification and total kinetic energy measurement. We have improved particle separation and installed new detectors that fully stop ions with kinetic energy up to 170 MeV. To reduce the contribution of the low energy tail in the quasi-monoenergetic neutron spectrum, we have applied time-of-flight techniques and investigated the results for measurements with 175 MeV neutrons. We have investigated the response function of the CsI(Tl) scintillators and describe a method for efficiency correction. We have studied the signal-to-background ratio of the new configuration of the spectrometer and of the collimation system. A method to obtain absolute cross-section normalization, separating the peak neutrons from the low-energy tail, is proposed. Finally we have characterized the 175 MeV quasi-monoenergetic neutron spectrum with the Medley spectrometer. This upgraded configuration has been used in 2007 and 2009 for light-ion production measurements at 175 MeV from C, Si, O, Fe, Bi and U.</p>
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3.
  • Bevilacqua, Riccardo, et al. (författare)
  • Medley spectrometer for light ions in neutron-induced reactions at 175 MeV
  • 2011
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. - 0168-9002 .- 1872-9576. ; 646:1, s. 100-107
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We have upgraded the Medley spectrometer to measure neutron-induced double differential cross-sections for light-ion production, with neutron energies up to 175 MeV. Measurements were performed at the quasi-monoenergetic neutron beam line at the The Svedberg Laboratory, in Uppsala (Sweden). Medley is a spectrometer system composed of eight three-element telescope detectors; Delta E-E technique is used for particle identification and total kinetic energy measurement. We have improved particle separation and installed new detectors that fully stop ions with kinetic energy up to 170 MeV. To reduce the contribution of the low energy tail in the quasi-monoenergetic neutron spectrum, we have applied time-of-flight techniques and investigated the results for measurements with 175 MeV neutrons. We have investigated the response function of the CsI(Tl) scintillators and describe a method for efficiency correction. We have studied the signal-to-background ratio of the new configuration of the spectrometer and of the collimation system. A method to obtain absolute cross-section normalization, separating the peak neutrons from the low-energy tail, is proposed. Finally we have characterized the 175 MeV quasi-monoenergetic neutron spectrum with the Medley spectrometer. This upgraded configuration has been used in 2007 and 2009 for light-ion production measurements at 175 MeV from C, Si, O, Fe, Bi and U.</p>
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4.
  • Bevilacqua, Riccardo, et al. (författare)
  • Neutron induced light-ion production from Iron and Bismuth at 175 MeV
  • 2010
  • Ingår i: CNR '09 : SECOND INTERNATIONAL WORKSHOP ON COMPOUND NUCLEAR REACTIONS AND RELATED TOPICS.
  • Konferensbidrag (refereegranskat)abstract
    • <p>We have measured light-ion (p, d, t, He-3 and alpha) production in the interaction of 175 MeV neutrons with iron and bismuth, using the MEDLEY setup. A large set of measurements at 96 MeV has been recently completed and published, and now higher energy region is under investigation. MEDLEY is a conventional spectrometer system that allows low-energy thresholds and offers measurements over a wide angular range. The system consists of eight telescopes, each of them composed of two silicon surface barrier detectors, to perform particle identification, and a Csl(Tl) scintillator to fully measure the kinetic energy of the produced light-ions. The telescopes are placed at angles from 20 degrees to 160 degrees, in steps of 20 degrees. Measurements have been performed at The Svedberg Laboratory, Uppsala (Sweden), where a quasi mono-energetic neutron beam is available and well characterized. Time of flight techniques are used to select light-ion events induced by neutrons in the main peak of the source neutron spectrum. We report preliminary double differential cross sections for production of protons, deuterons and tritons in comparison with model calculations using TALYS-1.0 code.</p>
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5.
  • Tesinsky, Milan, et al. (författare)
  • MCNPX simulations of the SCANDAL setup for measurement of neutron scattering cross section at 175MeV
  • 2010
  • Ingår i: Physica Scripta. - 0031-8949 .- 1402-4896. ; 81:6, s. 065202
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The Scattered Nucleon Detection Assembly (SCANDAL) setup at The Svedberg Laboratory has been used to produce neutron elastic scattering cross section data at 175MeV for bismuth and iron. This work presents MCNPX simulations of the experimental setup and aims to describe processes and data important for the upcoming off-line data analysis. In the experiment, neutrons scattered off the target are converted to protons, which are stopped in scintillator crystals. The results include a description of the proton spectra dependence on the neutron-to-proton conversion angle, suggesting a cut at a conversion angle of 15.2 degrees. Calculation of the hit position gates indicates high proton leakage from the crystals. A study of the converter describes the role of its chemical composition and also the role of other plastic scintillators on the proton spectra. The neutron-to-proton conversion efficiency of the converter simulated by MCNPX is 5.1x10(-4) and corresponds to theoretical predictions.</p>
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6.
  • Tesinsky, Milan, et al. (författare)
  • MCNPX simulations of the SCANDAL setup for measurement of neutron scattering cross section at 175MeV
  • 2010
  • Ingår i: Physica Scripta. - 0031-8949 .- 1402-4896. ; 81:6, s. 065202
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The Scattered Nucleon Detection Assembly (SCANDAL) setup at The Svedberg Laboratory has been used to produce neutron elastic scattering cross section data at 175MeV for bismuth and iron. This work presents MCNPX simulations of the experimental setup and aims to describe processes and data important for the upcoming off-line data analysis. In the experiment, neutrons scattered off the target are converted to protons, which are stopped in scintillator crystals. The results include a description of the proton spectra dependence on the neutron-to-proton conversion angle, suggesting a cut at a conversion angle of 15.2 degrees. Calculation of the hit position gates indicates high proton leakage from the crystals. A study of the converter describes the role of its chemical composition and also the role of other plastic scintillators on the proton spectra. The neutron-to-proton conversion efficiency of the converter simulated by MCNPX is 5.1x10(-4) and corresponds to theoretical predictions.</p>
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