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HK: Hadronen und Kerne

HK 19: Application of Nuclear Techniques I

HK 19.4: Talk

Monday, March 16, 1998, 17:45–18:00, G

Neutron Magnetic Tomography — •H. Leeb, M. Hochhold, and F. Korinek — Institut für Kernphysik, TU Wien, Wiedner Hauptstraße 8-10, A-1040 Wien, Austria

Recently we proposed a tomographic extension of the three-dimensional neutron depolarization technique [1]. It is conjectured that the novel method allows the direct visualization of the magnetic domain structure within bulk ferromagnetic materials for the first time. The corresponding tomographic problem is much more involved than that of conventional x-ray tomography because of the tensorial character of the measured data. No analytical solution for the backprojection of the polarization data is presently known and it is even not clear whether a retrieval of the internal magnetic field distribution is possible. In this contribution we present numerical algorithms which take into account the tensorial character of the tomographic problem. Using simulated data we demonstrate the feasibility of the analysis of tomographic depolarization data. Our results indicate that the reconstruction of the magnetic domain structure within bulk materials is indeed possible. The experimental implementation of the method is discussed.

Work supported by FWF, project No. P10969-PHY

[1] M. Hochhold, H. Leeb and G. Badurek, J. Magn. Magn. Materials 157/158, 575 (1996).