Y. Watanabe, L. N. Hand, S. Herb, and A. Russell^*,†

• Laboratory of Nuclear Studies, Cornell University, Ithaca, New York 14853

C. Chang, K. K. W. Chen, D. J. Fox^‡, A. Kotlewski, and P. F. Kunz^†,§

• Physics Department, Michigan State University, East Lansing, Michigan 48824

S. C. Loken and M. Strovink^∥

• Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

W. Vernon^†

• Physics Department, University of California, San Diego, La Jolla, California 92037

• ^*Present address: Texaco Exploration Canada, Ltd., Calgary, Alta., Canada.
• ^†Work supported in part by the National Science Foundation.
• ^‡Deceased.
• ^§Now at Stanford Linear Accelerator Center, Stanford, Calif. 94305.
• ^∥Work supported in part by the U. S. Atomic Energy Commission.