Attempt to confirm superheavy element production in the 48 Ca + 238 U reaction

K. E. Gregorich,1 W. Loveland,2 D. Peterson,3 P. M. Zielinski,1,4 S. L. Nelson,1,4 Y. H. Chung,5 Ch. E. Düllmann,1,4 C. M. Folden III,1,4 K. Aleklett,6 R. Eichler,7,8 D. C. Hoffman,1,4 J. P. Omtvedt,9 G. K. Pang,4 J. M. Schwantes,4,10 S. Soverna,7,8 P. Sprunger,2 R. Sudowe,1 R. E. Wilson,1,4 and H. Nitsche1,4 1Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 2Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA 3Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA 4Department of Chemistry, University of California, Berkeley, California 94720, USA 5Department of Chemistry, Hallym University, Chuncheon, Korea 200-702 6Department of Chemistry, Uppsala University, SE-751 05 Uppsala, Sweden 7Labor für Radiound Umweltchemie, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland 8Departement für Chemie und Biochemie, Universität Bern, CH-3012 Bern, Switzerland 9Department of Chemistry, University of Oslo, NO-0316 Oslo, Norway 10Isotope & Nuclear Chemistry, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA (Received 24 March 2005; published 14 July 2005)