P. A. Wilk

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The discovery of a new chemical element with atomic number Z=117 is reported. The isotopes (293)117 and (294)117 were produced in fusion reactions between (48)Ca and (249)Bk. Decay chains involving 11 new nuclei were identified by means of the Dubna gas-filled recoil separator. The measured decay properties show a strong rise of stability for heavier(More)
293 118 reaction was repeated. No events corresponding to the synthesis of element 118 were observed with a total beam dose of 2.6 x 10 18 ions. The simple upper limit cross sections (1 event) were 0.9 and 0.6 pb for evaporation residue magnetic rigidities of 2.00 T m and 2.12 T m, respectively. A more detailed cross section calculation, accounting for an(More)
Yu. Ts. Oganessian,* F. Sh. Abdullin, P. D. Bailey, D. E. Benker, M. E. Bennett, S. N. Dmitriev, J. G. Ezold, J. H. Hamilton, R.A. Henderson, M.G. Itkis, Yu. V. Lobanov, A.N. Mezentsev, K. J. Moody, S. L. Nelson, A.N. Polyakov, C. E. Porter, A. V. Ramayya, F. D. Riley, J. B. Roberto, M.A. Ryabinin, K. P. Rykaczewski, R. N. Sagaidak, D. A. Shaughnessy, I. V.(More)
We report the experimental con rmation of the production of element 110 by an independent group. In the bombardment of a 208Pb target with a 309 MeV 64Ni beam we have observed two chains of timeand positioncorrelated events. Each chain consisted of the implantation of an evaporation residue followed by the emission of -particles. We attribute these two(More)
In April-May, 2001, the previously reported experiment to synthesize element 118 using the 208Pb(86Kr,n)293118 reaction was repeated. No events corresponding to the synthesis of element 118 were observed with a total beam dose of 2.6 x 10 ions. The simple upper limit cross sections (1 event) were 0.9 and 0.6 pb for evaporation residue magnetic rigidities of(More)
Yu. Ts. Oganessian,1,* F. Sh. Abdullin,1 P. D. Bailey,2 D. E. Benker,2 M. E. Bennett,3 S. N. Dmitriev,1 J. G. Ezold,2 J. H. Hamilton,4 R. A. Henderson,5 M. G. Itkis,1 Yu. V. Lobanov,1 A. N. Mezentsev,1 K. J. Moody,5 S. L. Nelson,5 A. N. Polyakov,1 C. E. Porter,2 A. V. Ramayya,4 F. D. Riley,2 J. B. Roberto,2 M. A. Ryabinin,6 K. P. Rykaczewski,2 R. N.(More)
R. Eichler, Ch. Düllmann, H.W. Gäggeler (Univ. Bern & PSI), B. Eichler, D.T. Jost, D. Piquet, L. Tobler, A. Türler, P. Zimmermann (PSI), T. Häfeli, V.M. Lavanchy (Univ. Bern) K.E. Gregorich, D.C. Hoffman, U. Kirbach, C.A. Laue, H. Nitsche, J. Patin, D.A. Shaughnessy, D. Strellis, P. Wilk (UCB&LBNL) R. Dressler (TU Dresden), S. Hübener, S. Taut, A. Vahle(More)
Manganese oxides, present as minor phases in the vadose zone, have been previously shown to sequester large quantities of plutonium under environmental conditions. We are now continuing these studies with Np(V). Sorption onto manganite (MnOOH) and hausmannite (Mn3O4) at solid-to-solution ratios of 2.5-3.3 mg/mL has been studied as a function of neptunium(More)
In April-May, 2001, the previously reported experiment to synthesize element 118 using the Pb(Kr,n)118 reaction was repeated. No events corresponding to the synthesis of element 118 were observed with a total beam dose of 2.6 × 10 ions. The simple upper-limit cross-sections (1 event) were 0.9 and 0.6 pb for evaporation residue magnetic rigidities of 2.00 Tm(More)
293 118 reaction was repeated. No events corresponding to the synthesis of element 118 were observed with a total beam dose of 2.6 x 10 18 ions. The simple upper limit cross sections (1 event) were 0.9 and 0.6 pb for evaporation residue magnetic rigidities of 2.00 T m and 2.12 T m, respectively. A more detailed cross section calculation, accounting for an(More)
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