J. Phys. IV France 03 (1993) C8-471-C8-474
Supermirrors study by neutron multireflectionB. BALLOT1, A. MENELLE1, K. AL USTA2, B. FARNOUX1 and F. SAMUEL2
1 Laboratoire Léon Brillouin, CEA-CNRS, CE Saclay, 91191 Gif-sur-Yvette cedex, France
2 Cilas, Route de Nozay, BP 27, 91460 Marcoussis, France
We present here time of flight neutron multireflection measurements. This technique has been developed at the Laboratoire Léon Brillouin (Saclay-France). Used in the investigation of supermirrors NiC/Ti, it allows us to increase the precision of the measurement of the most important part of the curve for technological applications : the extension of the total reflection plateau. The results on three systems (58Ni single layer, multilayer NiC/Ti, supermirror NiC/Ti) are presented in this paper. Beyond the good quality of the mirrors, they demonstrate the very good reliability of such a measurement. Moreover, they show that compared to a classical single reflection measurement, multireflection experiment enables us to increase the accuracy of the reflectivity value measured on the extended plateau.
© EDP Sciences 1993