Attempt to confirm superheavy element production in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ca</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>48</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>238</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>reaction
Κ. Ε. GregorichNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USAW. LovelandDepartment of Chemistry, Oregon State University, Corvallis, Oregon 97331, USAD. PetersonPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439, USAP.M. ZielińskiDepartment of Chemistry, University of California, Berkeley, California 94720, USAStephen NelsonDepartment of Chemistry, University of California, Berkeley, California 94720, USAYong Hee ChungDepartment of Chemistry, Hallym University, Chuncheon, Korea 200-702Ch. E. DüllmannDepartment of Chemistry, University of California, Berkeley, California 94720, USAC. M. FoldenDepartment of Chemistry, University of California, Berkeley, California 94720, USAK. AleklettDepartment of Chemistry, Uppsala University, SE-751 05 Uppsala, SwedenR. EichlerDepartement für Chemie und Biochemie, Universität Bern, CH-3012 Bern, SwitzerlandD. C. HoffmanDepartment of Chemistry, University of California, Berkeley, California 94720, USAJ. P. OmtvedtDepartment of Chemistry, University of Oslo, NO-0316 Oslo, NorwayG. K. PangDepartment of Chemistry, University of California, Berkeley, California 94720, USAJon M. SchwantesDepartment of Chemistry, University of California, Berkeley, California 94720, USAS. SovernaDepartement für Chemie und Biochemie, Universität Bern, CH-3012 Bern, SwitzerlandP. H. SprungerDepartment of Chemistry, Oregon State University, Corvallis, Oregon 97331, USARalf SudoweNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USARichard E. WilsonDepartment of Chemistry, University of California, Berkeley, California 94720, USAH. NitscheDepartment of Chemistry, University of California, Berkeley, California 94720, USA
2005lv
ABI
Abstract
An attempt to confirm production of superheavy elements in the reaction of $^{48}\mathrm{Ca}$ beams with actinide targets has been performed using the $^{238}\mathrm{U}$($^{48}\mathrm{Ca}$,3$n){}^{283}$112 reaction. Two $^{48}\mathrm{Ca}$ projectile energies were used that spanned the energy range where the largest cross sections have been reported for this reaction. No spontaneous fission events were observed. No \ensuremath{\alpha} decay chains consistent with either reported or theoretically predicted element 112 decay properties were observed. The cross-section limits reached are significantly smaller than the recently reported cross sections.
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