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48Ca+249Bk fusion reaction leading to element Z = 117: long-lived α-decaying 270Db and discovery of 266Lr.
The superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. TheExpand
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Production and decay of element 114: high cross sections and the new nucleus 277Hs.
The fusion-evaporation reaction 244Pu(48Ca,3-4n){288,289}114 was studied at the new gas-filled recoil separator TASCA. Thirteen correlated decay chains were observed and assigned to the productionExpand
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First Superheavy Element Experiments at the GSI Recoil Separator TASCA: The Production and Decay of Element 114 in the 244Pu(48Ca,3-4n) Reaction
Experiments with the new recoil separator, Transactinide Separator and Chemistry Apparatus (TASCA), at the GSI were performed by using beams of Ca-48 to irradiate targets of Pb206-208, which led toExpand
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Spectroscopy of element 115 decay chains.
A high-resolution α, x-ray, and γ-ray coincidence spectroscopy experiment was conducted at the GSI Helmholtzzentrum für Schwerionenforschung. Thirty correlated α-decay chains were detected followingExpand
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Gas chemical investigation of hafnium and zirconium complexes with hexafluoroacetylacetone using preseparated short-lived radioisotopes
Abstract Volatile metal complexes of the group 4 elements Zr and Hf with hexafluoroacetylacetonate (hfa) have been studied using short-lived radioisotopes of the metals. The new technique of physicalExpand
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On the discovery of new elements (IUPAC/IUPAP Provisional Report)
Abstract Almost thirty years ago the criteria that are currently used to verify claims for the discovery of a new element were set down by the comprehensive work of a Transfermium Working Group, TWG,Expand
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Multi-quasiparticle states in (256)Rf
Excited states in (256)Rf were populated via the Pb-208(Ti-50,2n) fusion-evaporation reaction. Delayed gamma-ray and electron decay spectroscopy was performed and three isomeric states in (256)Rf hExpand
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New superheavy element isotopes: ²⁴²Pu(⁴⁸Ca,5n) ²⁸⁵114.
The new, neutron-deficient, superheavy element isotope ²⁸⁵114 was produced in ⁴⁸Ca irradiations of ²⁴²Pu targets at a center-of-target beam energy of 256 MeV (E*=50  MeV). The α decay of ²⁸⁵114wasExpand
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First Direct Measurements of Superheavy-Element Mass Numbers.
An experiment was performed at Lawrence Berkeley National Laboratory's 88-in. Cyclotron to determine the mass number of a superheavy element. The measurement resulted in the observation of twoExpand
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Decay spectroscopy of element 115 daughters: ²⁸⁰Rg → ²⁷⁶Mt and ²⁷⁶Mt → ²⁷²Bh
Author(s): Gates, JM; Gregorich, KE; Gothe, OR; Uribe, EC; Pang, GK; Bleuel, DL; Block, M; Clark, RM; Campbell, CM; Crawford, HL; Cromaz, M; Di Nitto, A; Dullmann, CE; Esker, NE; Fahlander, C;Expand
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