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Objective: additional identification of odd Z=113, 115 and 117 nuclei

Objective: additional identification of odd Z=113, 115 and 117 nuclei. Radioactive properties of even-Z nuclei. New results on the synthesis of element 115 in the reaction 243 Am+ 48 Ca V.K. Utyonkov.

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Objective: additional identification of odd Z=113, 115 and 117 nuclei

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  1. Objective: additional identification of odd Z=113, 115 and 117 nuclei Radioactive properties of even-Z nuclei New results on the synthesis of element 115 in the reaction 243Am+48Ca V.K. Utyonkov In accordance with the criteria for the discovery of elements previously established by the 1992 IUPAC/IUPAP Transfermium Working Group (TWG), and reinforced in subsequent IUPAC/IUPAP JWP discussions, it was determined that the Dubna-Livermore collaborations share in the fulfillment of those criteria both for elements Z = 114 and 116.

  2. Production properties of even-Z nuclei: yield curve Cross bombardments

  3. chemical identification: group 5 element 268Db 1. More decay chains 2. Excitation function 3. Cross bombardments Cross bombardments

  4. Gas-Filled Recoil Separator max gradient = 13 T/m r = 1.8 m Br max = 3.1 Tm

  5. Radioactive properties of odd-Z nuclei

  6. Radioactive properties of odd-Z nuclei

  7. Production properties of odd-Z nuclei: yield curve

  8. Radioactive properties of odd-Z nuclei

  9. Future experiments: excitation function identification of Z by X-rays of 268Rf 266-270DbSF/b

  10. Summary: Discovery of elements 113 and 115 produced in 2003 was confirmed by observation of 21 new decay chains originating from 288115, the product of the 3n-evaporation channel of the reaction 243Am+48Ca. Decay properties of all the six nuclei 288115, 284113, 280Rg, 276Mt, 272Bh, and268Db synthesized in 2003 are in full agreement with those measured in the recent experiments. Excitation function of the reaction 243Am+48Ca was measured at three lower projectile energies. Experiments are to be continued. Discovery of element 117 was confirmed by registration of the decay chain of 289115 which was produced for the first time in the reaction 249Bk(48Ca,4n) as the descendant nucleus of 293117. The isotope 289115 was synthesized in two cross bombardments.

  11. Yu.Ts. Oganessian,1F.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 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. Sagaidak,1 D.A. Shaughnessy,5 I.V. Shirokovsky,1 M.A. Stoyer,5 V.G. Subbotin,1 R. Sudowe,3 A.M. Sukhov,1 R. Taylor,2Yu.S. Tsyganov,1 V.K. Utyonkov,1 A.A. Voinov,1 G.K. Vostokin,1 and P.A. Wilk5 1Joint Institute for Nuclear Research, RU-141980 Dubna, Russian Federation 2Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA 4Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA 5Lawrence Livermore National Laboratory, Livermore, California 94551, USA 6Research Institute of Atomic Reactors, RU-433510 Dimitrovgrad, Russian Federation

  12. 261Sga-g K (Rf) L (Rf)

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