Objective: additional identification of odd Z=113, 115 and 117 nuclei Radioactive properties of even-Z nuclei In accordance with the criteria for the discovery.

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Presentation transcript:

Objective: additional identification of odd Z=113, 115 and 117 nuclei Radioactive properties of even-Z nuclei 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.

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

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

Gas-Filled Recoil Separator  = 1.8 m B  max = 3.1 Tm max gradient = 13 T/m

Target thickness mg/cm 2 E lab (MeV)E exc (MeV)Beam dose x Number of chains

Radioactive properties of odd-Z nuclei

Production properties of odd-Z nuclei: yield curve

Radioactive properties of odd-Z nuclei

Db SF/  Future experiments: excitation function identification of Z by X-rays of 268 Rf identification of Z by X-rays of 268 Rf

Summary: Discovery of elements 113 and 115 produced in 2003 was confirmed by observation of 21 new decay chains originating from , the product of the 3n-evaporation channel of the reaction 243 Am+ 48 Ca. Decay properties of all the six nuclei , , 280 Rg, 276 Mt, 272 Bh, and 268 Db synthesized in 2003 are in full agreement with those measured in the recent experiments. Excitation function of the reaction 243 Am+ 48 Ca 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 which was produced for the first time in the reaction 249 Bk( 48 Ca,4n) as the descendant nucleus of The isotope was synthesized in two cross bombardments.

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 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, 2 Yu.S. Tsyganov, 1 V.K. Utyonkov, 1 A.A. Voinov, 1 G.K. Vostokin, 1 and P.A. Wilk 5 1 Joint Institute for Nuclear Research, RU Dubna, Russian Federation 2 Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3 University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA 4 Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA 5 Lawrence Livermore National Laboratory, Livermore, California 94551, USA 6 Research Institute of Atomic Reactors, RU Dimitrovgrad, Russian Federation

261 Sg 