The D = 10 -E, x E8 field theory limit of the heterotic string is compactified on the non-symmetric coset space Sp(4)/SU(2) x U(l) that is known in the limit of decoupled gravity to give three standard fermion generations, with SU (5) Allowing for non-vanishing fermion bilinear condensates, and assuming the conventional form of the supersymmetry transformations, we prove the presence of a family of N = 1 supersymmetric background field configurations. This requires the non-compact space to be flat: (Minkow~ki)~, while the 3-form HMNp is non-vanishing and proportional to the torsion on the internal manifold. All equations of motion, including that of the dilaton, are satisfied.

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The effect of the elastic fields of dislocations on y-ray perturbed angular correlations in paramagnets has been investigated. The y-ray directional correlations are perturbed by magnetic hyperfine and nuclear Zeeman interactions. Tho crystal imperfections cause the hyperfine splittings to vary from ion to ion. The frequency-averaged perturbation factor taking into account these variations is obtained.

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