James Daley^*

• Department of Physics, University of California at Berkeley, Berkeley, California 94720

Marvin Douglas^†, Lars Hambro^‡, and Norman M. Kroll^†

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

• ^*Work supported in part by the U. S. Air Force Office of Scientific Research.
• ^†Work supported in part by the U. S. Atomic Energy Commission.
• ^‡Work supported in part by the National Science Foundation.