1. J. S. Higgins, L. K. Nicholson, and J. B. Hayter, “Observation of single chain motion in a polymer melt,” preprint (1980).
2. V. F. Sears, “Dynamic theory of neutron diffraction,” Can. J. Phys. 56: 1262 (1978).
3. Bound scattering length refers to scattering length of a nucleus which is fixed in space. Measurement of scattering length is normally made in a situation where the nucleus is free to recoil. The measurement gives free scattering length a which is related to b by b = [(A+1)/A]a where A is atomic weight of the nucleus. See G. E. Bacon, Neutron Diffraction, 2d ed., Oxford (1975) for tabulation of values of b.
4. H. Rauch, and D. Petrascheck, “Dynamical neutron diffraction and its application,” in Neutron Diffraction, ed. by H. Dachs, Springer-Verlag, Berlin (1978).
5. The Fermi approximation is discussed clearly in R. G. Sachs, Nuclear Theory, Addison-Wesley, Reading, Mass. (1953). p. 91.