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[en] The properties of such haloid compounds of the element 114 are discussed as might be used for gas-phase-separation of the element from a mixture produced by nuclear reactions, viz. 114Cl₂, 114Cl₄, 114F₆. Boiling points and energies of dissociation are the properties evaluated by extrapolation. (orig.)

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[en] Studies of the superheavy elements form one of the pillars of the GSI research program. A unique combination of experimental facilities is installed at the GSI. Various topics, ranging from the synthesis of new elements, spectroscopy experiments to study the nuclear structures of the heaviest nuclei, highly accurate mass measurements beyond uranium, to chemical investigations of elements around element 114 and the synthesis of novel chemical superheavy element compound classes are being studied. This is complemented by fully relativistic quantum chemical calculations. As a recent highlight, the ²⁴⁴Pu(⁴⁸Ca,3-4n)^288,289 114 reaction was studied, leading to the observation of element 114 at the new gas-filled recoil separator TASCA. (orig.)

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[en] We report on the first independent verification of element 114 at Lawrence Berkeley National Laboratory (LBNL). In the past years the Dubna Gas Filled Recoil Separator (DGFRS) group reported the successful synthesis of superheavy elements (SHE) in numerous ⁴⁸Ca irradiations of actinide targets. Cross sections reported from these experiments are remaining rather constant at the level of a few picobarns, breaking the strong downward trend obvious in hot fusion reactions with other projectiles. Verification of the DGFRS results hence is of paramount importance, but for a long time, confirmation attempts failed to produce SHE in ⁴⁸Ca induced reactions. In a 8-day experiment at the Berkeley Gas-filled Separator (BGS) at LBNL we have observed production of two atoms of element 114 in the reaction ⁴⁸Ca(²⁴²Pu,3-4n)^287,286114. Based on the observed decay properties these decay chains were attributed to the decay of ²⁸⁷114 and ²⁸⁶114 produced in the 3n and 4n channel, respectively. Decay modes, lifetimes, and decay energies are consistent with those reported by the DGFRS group. The 1.4 pb cross sections measured in this work for both the 3n and 4n channels are lower than 3.6 pb and 4.5 pb, respectively, reported by the DGFRS group.

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[en] The ground state properties of even-even Z = 114 nuclei have been investigated in the relativistic mean-field theory with inclusion of deformations. The calculated binding energies agree well with values from macroscopic mass models. Calculations show that there exists a spherical shell at N = 184, because the quadrupole deformation at N = 184 is zero. For nuclei near N =162, there are small prolate deformations