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They are also grateful to E. d'Arterriare and J. P. Nadai for the helpful discussions and for making data available prior to publication. The comments of R. Castaing, Paris, and S. S. Markowitz of the Lawrence Radiation Laboratories, Berkeley, Calif., are also greatly appreciated. One of us (D.S.) also acknowledges the hospitality of M. Calvin of the Lawrence Radiation Laboratory, Berkeley, Calif., during which various aspects of this paper were completed.

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