Geometrical relationships illustrate the significance of the transformation between new and orbital quantum numbers. The semiclassical analysis of 6j coefficients by Ponzano and Regge clarifies the geometrical relationships and identifies a classically forbidden range, which can be singled out for its small contribution to the summation over the partial waves relevant to observable parameters (differential cross section and orientation).
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Chun‐Woo Lee (1986) studied this question.
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