Affiliation: | *Department of Nuclear Engineering, The University of Tennessee, Knoxville, TN 37996-2300, U.S.A. **Physics Department, Southern Illinois University, Carbondale, IL 62901, U.S.A. ***Materials Division, NASA Langley Research Center, Hampton, VA 23681, U.S.A. †Physics Department, Old Dominion University, Norfolk, VA 23529, U.S.A. |