1. For a simple derivation see for instanceBeta- and Gamma-Ray Spectroscopy (edited byK. Siegbahn, New York, 1955), Chapter XIX (I) byH. Frauenfelder, § 3.
2. L. C. Biedenharn andM. E. Rose:Rev. Mod. Phys.,25, 729 (1953). These tables are reproduced in ref. (1), Appendix V.
3. M. Ferentz andN. Rosenzweig:Argonne National Laboratory Report 5324 (1954).
4. For a survey of this subject and further references seeH. Frauenfelder. ref. (1), § 9.
5. G. Racah:Phys. Rev.,62, 938 (1942).