Spin-dependent scattering lengths of slow neutrons with nuclei by pseudomagnetic measurements

The spin-dependent scattering length of slow neutrons by the nuclei 23Na, 59Co, 63Cu, 65Cu, 195Pt, 197Au and 207Pb, as well as the mean value for the two isotopes of Tl and Ag in the natural element have been obtained by measuring the precession of the neutron spins as a function of nuclear polarization. A revised value for 91Zr is also given. The method has been extended for use with magnetic materials. Using f.c.c. and hexagonal cobalt, it is shown that these pseudomagnetic measurements may give precise information on the internal field seen by the nuclei.