By means of the magneto-optical Faraday effect the influence of neutron irradiation on the critical current density of Nb3Sn diffusion layers of large grain size is investigated. For influences of Φ{nvt(E > 0.1 MeV)} 0.1 MeV)} > 4 × 1018 is caused due to the overlap of defect cascades. In addition to the defect cascades the matrix is perturbed by antisite defects leading to a nearly homogeneous distribution of the radiation induced disorder. Within the framework of the direct summation model the measured critical current density can be described sufficiently well. Mittels des magnetooptischen Faradayeffektes wird die Dosisabhangigkeit der kritischen Stromdichte neutronenbestrahlter Nb3Sn Diffusionsschichten groser mittlerer Korngrose untersucht. Der Anstieg der kritischen Stromdichte bei kleinen Bestrahlungsdosen Φ{nvt(E > 0.1 MeV)} 0,1 MeV)} > 4 × 1018 beobachtet man einen starken Abfall der kritischen Stromdichte, herruhrend von Uberlappungseffekten benachbarter Defektkaskaden. Unter Annahme einer nahezu homogenen Verteilung der strahlungsinduzierten Fehlordnung lassen sich die gemessenen Stromdichten im Rahmen des direkten Summationsmodells befriedigend beschreiben.
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Klein et al. (1981) studied this question.
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