PICKUP BEHAVIOR 123 lengths in the wave functions for the alpha particle in Li 6 , and for the proton in He 3 , respectively; rj is defined, approximately, by tam7 = 7/Z+l/Zfo. This result has the same form as the deuteron pickup angular distribution. However, because Z is smaller than the corresponding K, appropriate for deuteron pickup, the oscillations in the backward direction can be fitted only with a much larger radius than for the other process. This is illustrated by curve d in Fig. 4, computed from the relation above, at 18.5 Mev for ro=8.4XlO~1 3 cm, with arbitrary normalization. Also, the angular distribution should shift considerably on lowering the proton energy. This is illustrated by curve c, in Fig. 3, calculated for the same radius, at 15 Mev. The impossibly large radius, and the fact that no shift is observed between the angular distributions at the two energies, suggest that the minimum, observed N. P. HEYDENBURG AND G. M. TEMMER
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