Attempts to chemically investigate element 112
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R. Eichler
Summary
Two experiments aiming at the chemical investigation of element 112 produced in the heavy ion induced nuclear fusion reaction of 48Ca with 238U were performed at the Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany. Both experiments were designed to determine the adsorption enthalpy of element 112 on a gold surface using a thermochromatography setup. The temperature range covered in the thermochromatography experiments allowed the adsorption of Hg at about 35 °C and of Rn at about -180 °C. Reports from the Flerov Laboratory for Nuclear Reactions (FLNR), Dubna, Russia claim production of a 5-min spontaneous fission (SF) activity assigned to 283112 for the 238U(48Ca,3n) 283112 reaction. Hence, Experiment I was designed to detect spontaneously fissioning (SF) isotopes of element 112 with half-lives (t1/2) longer than about 20 s. 11 high-energy events were detected. 7 events exhibit a deposition pattern resembling a chromatographic peak in the vicinity of Rn deposition. However, the energy of the events observed in Experiment I was lower than expected for a SF-decay of 283112. Therefore, these events could not be unambiguously attributed to the decay of 283112. In contradiction with earlier publications newer reports from FLNR Dubna claim that 283112 decays by α-particle emission (Eα = 9.5 MeV) with t1/2 = 4 s followed by a SF-decay of 279Ds (t1/2 = 0.2 s). Therefore, Experiment II was designed to be sensitive to both claimed decay properties of 283112. However, during this experiment neither short α-SF correlations nor SF coincidences were detected. The conclusion is that 283112 was not unambiguously detected, neither in Experiment I nor in Experiment II.
© by Oldenbourg Wissenschaftsverlag, München
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- Electroplating/electrodissolution/recovery cycle for rhodium target used for an industrial scale cyclotron production of palladium-l03
- Effects of phosphate and ionic strength upon uranium(VI) sorption onto alumina as a function of pH
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Artikel in diesem Heft
- Attempts to chemically investigate element 112
- Distribution studies on Th(IV), U(VI) and Pu(IV) using tri-n-butylphosphate and N,N-dialkyl amides
- Solvent extraction studies on Th(IV) and U(VI) using PolyEthylene Glycol (PEG) based aqueous biphasic system (ABS) with 18-crown-6
- The aqueous complexation of thorium with citrate under neutral to basic conditions
- Production of [124I]-iodine on an 11 MeV cyclotron
- Electroplating/electrodissolution/recovery cycle for rhodium target used for an industrial scale cyclotron production of palladium-l03
- Effects of phosphate and ionic strength upon uranium(VI) sorption onto alumina as a function of pH
- Adsorption of lanthanum to goethite in the presence of gluconate
