Supplement to Experiment in Physics
Figure 16
Figure 16. The unique, once-forbidden spectrum of 91Y. The best theoretical fit is that which gives a straight line. The Fermi theory alone, a1 =1, does not give a straight line. The correction factor a1 = C[(W2 - moc2) + (Wo - W)2], does give a linear plot. From Konopinski and Langer (1953)
