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  • Electronic Resource  (2)
  • 61.40  (1)
  • Neutronenkleinstwinkelstreuung  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Investigation of heavy ion produced defect structures in insulators by small angle scattering (1985)
    Springer
    Applied physics 37 (1985), S. 37-46 
    Details
    ISSN: 1432-0630
    Keywords: 61.80 ; 61.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Fast heavy ions produce stable defects in most dielectrica. As examples mica, Polyethylenterephtalat and Polystyrol were irradiated with Ar, Ni, Kr, Xe and U ions in an energy range from 0.5 up to 20 MeV/u. The resulting defects were investigated by neutron and x-ray small-angle scattering. The ion beam supplied by the UNILAC accelerator at GSI Darmstadt is characterized by its small emittance, the well defined mass, charge and energy of the ions and their stochastical distribution in the phase space. In scattering experiments the system of scattering centers created by these ions causes a scattered intensity distribution which strongly depends on the orientation of the sample with respect to the unscattered neutron or x-ray beam. This dependence is investigated and explained. By a mathematical model — describing form, size, and density of the average ion track — the measured intensity distribution is simulated. Based on the model, computer procedures are written, simulating the scattering experiment by varying the most important experimental and instrumental parameters and calculating the expected theoretical intensity distribution on the detector. The parameter values of this model — the maximum density difference in the track, length of the defect, and radial dimension — are determined by least square fits to the measured data. A simple description of the dependence of these parameters on the ion energy can be given in relation to the energy loss of the primary ion. It is not only possible now to predict an expected track, to calculate its volume and the number of missing atoms, but moreover to check theories of the track formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617867
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  • 2
    Electronic Resource
    Electronic Resource
    Neutronenkleinstwinkelstreuung an Roten Blutzellen (1981)
    Springer
    Colloid & polymer science 259 (1981), S. 227-237 
    Details
    ISSN: 1435-1536
    Keywords: Kontrastvariation ; Neutronenkleinstwinkelstreuung ; Rote Blutzellen ; Streuvielfachheit ; Vielfachstreuung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary Neutron small-angle scattering from red blood cells has been studied in the region of very small scattering angles (Camera D11, Institut Laue-Langevin, Grenoble). The performance of the camera was examined near the limits of its resolution. In the region of single scattering the usual methods of evaluation have been successfully applied: the radius of gyration was determined as 2.8±0.2μ and the specific surface as 1.7 ± 0.6μ−1. In the region of multiple scattering a value of 1.7±0.3μ−1 resulted for the specific surface. The term “multiplicity of the scattering” was introduced which facilitates the classification and the evaluation of the measurements. By an application of the theoretical work ofLuzzati and ofSoulé resp. the measurements could be satisfactorily interpreted for all regions of scattering although it was in some cases not possible to exclude completely an influence of the refraction.
    Notes: Zusammenfassung Neutronenstreumessungen im Kleinstwinkelbereich wurden an Roten Blutzellen vorgenommen (Gerät D11, Institut Laue-Langevin, Grenoble). Die Meßmöglichkeiten des Geräts an der Auflösungsgrenze wurden erprobt. Im Einfachstreubereich konnten die üblichen Auswerteverfahren erfolgreich verwendet werden: der Streumassenradius wurde zu 2.8 ± 0.2 μ und die Spezifische Oberfläche zu 1.7 ± 0.6 μ−1 bestimmt. Im Vielfachstreubereich wurde die Spezifische Oberfläche zu 1.7 ± 0.3 μ−1 ermittelt. Durch Einführung des Begriffs der Streuvielfachheit lassen sich die Messungen besser einordnen. Mit den theoretischen Beugungsansätzen vonLuzzati bzw. Soulé war es möglich, die Messungen in allen Streubereichen zufriedenstellend zu deuten, obwohl teilweise ein Einfluß der Brechung von vorneherein nicht ganz ausgeschlossen werden konnte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01381765
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    Paper (German National Licenses)
    Fulltext
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