Energy Dependence for Direct Pair Production by Relativistic Oxygen Ions King, D. T. ; Derrickson, J. H. ; Eby, P. B. ; Fountain, W. F. ; Gregory, J. C. ; Moon, K. H. ; Ogata, T. ; Parnell, T. A. ; Dong, B. L. ; Takahashi, Y. Abstract Publication: International Cosmic Ray Conference Pub Date: August 1991 Bibcode: 1991ICRC....4..241K