Nicholas Stone

Abstract:

The temperature dependence of -ray emission patterns from symmetric ordered nuclear-spin systems is discussed with particular reference to planar spin configurations. In particular, explicit expressions for "average statistical tensors" »q(I) are derived, for nuclear-spin structures with two-, three-, four-, and six-fold axes of symmetry. Several interesting identities are derived, which are useful aids in the analysis of a given nuclear orientation experiment. For example, if the nuclear structure possesses either a twofold or an effective twofold axis of symmetry, then the temperature isotherms for 22 vs 02 statistical-tensor diagrams are simply parallel straight lines. © 1979 The American Physical Society.