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Sökning: WFRF:(Bergenwall B.)

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  • Bergenwall, B., et al. (författare)
  • Experimental kerma coefficients for carbon deduced from microscopic cross sections at 96 MeV incident neutron energy
  • 2004
  • Ingår i: Physics in Medicine and Biology. - : IOP Publishing. - 0031-9155 .- 1361-6560. ; 49:19, s. 4523-4542
  • Tidskriftsartikel (refereegranskat)abstract
    • The double-differential cross sections for (n, px), (n, dx), (n, tx), (n, (3)Hex) and (n, alphax) reactions in carbon have been measured at 96 MeV incident neutron energy. The various charged particles (inclusive spectra) were identified using A E-E techniques. From the experimental data, energy- and angle-differential as well as production cross sections were determined, and subsequently the partial and total kerma coefficients. The deduced partial and total kerma coefficients were compared to previous experimental results and theoretical calculations. The findings indicate that the deduced kerma coefficients for the hydrogen isotopes are in good agreement with those deduced from a previous measurement, and that the kerma coefficient values, in particular of the hydrogen isotopes, are systematically higher than values obtained from recent model calculations, which consequently resulted in a total kerma coefficient which is up to 30% higher than predicted by the calculations.
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  • Bergenwall, B., et al. (författare)
  • Neutron-induced light charged particle production in carbon at 96 MeV
  • 2005
  • Ingår i: Nuclear Physics A. - : Elsevier BV. - 0375-9474 .- 1873-1554. ; 747:2-4, s. 152-181
  • Tidskriftsartikel (refereegranskat)abstract
    • Differential cross sections of charged particle production, i.e., p, d, t, 3He-ions and α-particles, in 96 MeV neutron-carbon interactions have been measured at laboratory angles in the range 20° to 160° in steps of 20°. The experimental techniques are described as well as the procedures for acquisition, analysis, reduction and correction of the data. Results including double differential, energy-differential, angle-differential and total particle production cross sections are reported and constitute the first data set with five ejectiles at such a high neutron energy. Thanks to the low-energy thresholds, 50% of the production cross section of α-particles, and 85% of the production cross sections of protons and deuterons, could be measured. For α-particles, the measured fraction is much higher than what has been achieved earlier at lower energies. The results on the hydrogen isotopes agree fairly well with a previous measurement at 95 MeV and with recent GNASH calculations. For the helium isotopes, however, there are important discrepancies in spectral shape and magnitude between the new results and the model calculations.
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  • Dangtip, S, et al. (författare)
  • A facility for measurements of nuclear cross sections for fast neutron cancer therapy
  • 2000
  • Ingår i: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT. - : ELSEVIER SCIENCE BV. - 0168-9002. ; 452:3, s. 484-504
  • Tidskriftsartikel (refereegranskat)abstract
    • A facility for measurements of neutron-induced double-differential light-ion production cross-sections, for application within. e.g.. fast neutron cancer therapy, is described. The central detection elements are three-detector telescopes consisting of two
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  • Hildebrand, Angelica, et al. (författare)
  • Elastic Neutron Scattering at 96 MeV
  • 2004
  • Ingår i: Proc. Int. Conf. on Nuclear Data for Science and Technology.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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  • Hildebrand, A, et al. (författare)
  • Elastic neutron scattering at 96 MeV
  • 2005
  • Ingår i: Proc. of the Int. Conf. on Nuclear Data for Science and Technology: Santa Fé, New Mexico, USA, September 26-October 1, 2004. ; , s. 853-
  • Konferensbidrag (refereegranskat)
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  • Mermod, Philippe, et al. (författare)
  • 95 MeV neutron scattering on hydrogen, deuterium, carbon and oxygen
  • 2006
  • Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 74:5, s. 054002-
  • Tidskriftsartikel (refereegranskat)abstract
    • Three neutron-deuteron scattering experiments at 95 MeV have been performed recently at The Svedberg Laboratory in Uppsala. Subsets of the results of these experiments have been reported in two short articles, showing clear evidence for three-nucleon force effects. In this paper, we present a more detailed description of the experimental methods as well as further discussion of the results. In addition to neutron-deuteron scattering data, neutron-proton and C12(n,n) elastic scattering data have been measured for normalization purposes, and O16(n,n) data have been obtained for the first time at this energy. It was possible to extract C12(n,n') and O16(n,n') inelastic scattering cross sections to excited states below 12 MeV excitation energy. The inelastic scattering data (for both carbon and oxygen) are shown to have a significant impact on the determination of nuclear recoil kerma coefficients.
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  • Pomp, S, et al. (författare)
  • Nuclear Data for Medicine and Electronics
  • 2004
  • Ingår i: Proceedings of the International Workshop on Nuclear Data for the Transmutation of Nuclear Waste. - 3000122761
  • Konferensbidrag (refereegranskat)
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  • Pomp, S, et al. (författare)
  • The new Uppsala neutron beam facility
  • 2005
  • Ingår i: Proc. of the Int. conf. on Nuclear Data for Sceince and Technology: Santa Fé, New Mexico, USA, September 26-October 1, 2004. ; , s. 780-
  • Konferensbidrag (refereegranskat)
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  • Somsak, Dangtip, et al. (författare)
  • Facility for measurements of nuclear cross sections for fast neutron cancer therapy
  • 2000
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - 0168-9002 .- 1872-9576. ; 452:3, s. 484-504
  • Tidskriftsartikel (refereegranskat)abstract
    • A facility for measurements of neutron-induced double-differential light-ion production cross-sections, for application within, e.g., fast neutron cancer therapy, is described. The central detection elements are three-detector telescopes consisting of two silicon detectors and a CsI crystal. Use of ?E-?E-E techniques allows good particle identification for p, d, t, 3He and alpha particles over an energy range from a few MeV up to 100 MeV. Active plastic scintillator collimators are used to define the telescope solid angle. Measurements can be performed using up to eight telescopes at 20░ intervals simultaneously, thus covering a wide angular range. The performance of the equipment is illustrated using experimental data taken with a carbon target at En = 95 MeV. Distortions of the measured charged-particle spectra due to energy and particle losses in the target are corrected using a newly developed computer code. Results from such correction calculations are presented.
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  • Tippawan, U., et al. (författare)
  • Light-ion production in the interaction of  96 MeV neutrons with silicon
  • 2004
  • Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 69:6
  • Tidskriftsartikel (refereegranskat)abstract
    • Double-differential cross sections for light-ion (p, d, t, He-3, and alpha) production in silicon, induced by 96 MeV neutrons, are reported. Energy spectra are measured at eight laboratory angles from 20degrees to 160degrees in steps of 20degrees. Procedures for data taking and data reduction are presented. Deduced energy-differential, angle-differential, and production cross sections are reported. Experimental cross sections are compared to theoretical reaction model calculations and experimental data in the literature.
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  • Öhrn, Angelica, et al. (författare)
  • Elastic scattering of 96 MeV neutrons from iron, yttrium, and lead
  • 2008
  • Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 77:2, s. 024605-
  • Tidskriftsartikel (refereegranskat)abstract
    • Data on elastic scattering of 96 MeV neutrons from Fe-56, Y-89, and Pb-208 in the angular interval 10-70 degrees are reported. The previously published data on Pb-208 have been extended, as a new method has been developed to obtain more information from data, namely to increase the number of angular bins at the most forward angles. A study of the deviation of the zero-degree cross section from Wick's limit has been performed. It was shown that the data on Pb-208 are in agreement with Wick's limit while those on the lighter nuclei overshoot the limit significantly. The results are compared with modern optical model predictions, based on phenomenology and microscopic nuclear theory. The data on Fe-56, Y-89, and Pb-208 are in general in good agreement with the model predictions.
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  • Resultat 1-34 av 34

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