Use of the optical theorem in polarized neutron small angle scattering from ferrofluid

The magnetization process in a homogeneous colloid of fine magnetite partic les suspended in water at low concentration is studied by means of small an gle scattering of polarized neutrons. The data have been analyzed over the whole range of the scattering pattern including the zone of the interferenc e between scattered and thoroughgoing neutron waves. The absolute scale nuc lear and magnetic-nuclear interference scattering cross sections were deduc ed. (C) 1999 Elsevier Science B.V. All rights reserved.