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The concept of contrast variation due to nuclear polarization has been reformulated with the emphasis on small angle neutron scattering (SANS) of polymers in solution. SANS has been performed on solid solutions of polystyrene in deuterated toluene. The hydrogen nuclei have been polarized dynamically by the solid effect. Using an unpolarized neutron beam, a nuclear polarization of 50 % enhanced the intensity of the small angle scattering by a factor of 2 with respect to a non-polarized sample

The method of pseudomagnetic slow neutron precession has been used to obtain the spin-dependent (incoherent) scattering length of ~ 1V with a better precision than obtained before by other methods. The result, b § =12.81_+0.08 fm, is consistent with the earlier values.

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