• [1]

    S. P. Ahlen et al., Science, 217(1982), 1139.[2] K. Jamil et al.. Nucl.Instr. Meth. to be published.[3] M. H. Salamon et al., Nucl. Instr. Meth. in Phys. Rev, B6(1985), 504.[4] E. V. Benton U. S. Naval Radiological Defence Laboratory TR-68-14 (1968).[5]W . H. Barkas et al., National Academy of Science-National Research Council Publication-1133, 103(1964)[6] H. L. Bradt et al., Phys. Rev., 77(1950), 54.[7] G. D. Westfall et al., Phys. Rev., C19(1979), 1309.[8] M. L. Tincknell et al., Phys. Rev. Lett, 51(1983), 1948.