Dresden 2003 – wissenschaftliches Programm
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DF: Dielektrische Festkörper
DF 2: Elektrische und optische Eigenschaften II
DF 2.1: Hauptvortrag
Montag, 24. März 2003, 14:30–15:10, HSZ/403
Neutron Physics with Photorefractive Materials — •Romano A. Rupp1, Martin Fally1, Christian Pruner1, Jürgen Vollbrand2, Andreas Schreyer2 und Roland P. May3 — 1Inst. f. Experimentalphysik, Univ. Wien, Boltzmanngasse 5, A-1090 Wien, Austria — 2GeNF/TESLA, Inst. f. Werkstoffforschung, Abt. WFN (Neutronen-/Synchrotronstreuung), GKSS-Forschungszentrum, Postfach 1160, D-21494 Geesthacht, Germany — 3Institut Laue-Langevin, B.P.156, F-38042 Grenoble, Cedex 9, France
The probability amplitude for quanta interacting with matter can be determined from their field equation including appropriate terms for the interaction. In systems without generation or annihilation of quanta, the concept of a refractive-index field may be used to describe the solutions approximately. This generalized refractive index depends on the properties of both, of the quanta and of matter. For example, for photons the interaction is described by the dielectric tensor and for neutrons by the potential of the nuclear interaction. If changes of the refractive index are induced by an electric field or by irradiation with photons, we call the medium electrooptic or photorefractive, respectively. Presenting results of neutron diffraction experiments we discuss the electro-neutronoptic and the photo-neutronrefractive effects for LiNbO3 and photopolymers. We report on the realization of interferometers for cold neutrons based on holographic gratings written in photorefracive materials and point out the importance of neutron coherence in the experiments.