A History and Analysis of the Discovery of Elements 104 and 105

Hyde, Earl K.; Hoffman, Darleane C.; Keller, O.

doi:10.1524/ract.1987.42.2.57

Cited by 37 publications

(33 citation statements)

References 12 publications

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“…The observed position of fission tracks was similar to that of hafnium and was interpreted by Zvara et al as being the expected position of ekatantalum. Quite different interpretations were suggested as well [4,5]. Also, it is not clear whether the SF activity observed was exclusively due to the decay of isotopes of element 105.…”

Section: Previous Chemical Studiesmentioning

confidence: 99%

Chemical Properties of Element 105 in Aqueous Solution: Halide Complex Formation and Anion Exchange into Triisoctyl Amine

et al. 1989

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Studies of the halide complexation of element 105 in aqueous solution were performed on 34-s 262 Ha produced in the 249 Bk( ls O,5n) reaction. The 262 Ha was detected by measuring the fission and alpha activities associated with its decay and the alpha decays of its daughter, 4.3-s 258 Lr. Time-correlated pairs of parent and daughter alpha particles provided a unique identification of the presence of 262 Ha. About 1600 anion exchange separations of 262 Ha from HCl and mixed HC1/HF solutions were performed on a one-minute time scale. Reversed-phase micro-chromatographic columns incorporating triisooctyl amine (TIOA) on an inert support were used in the computer-controlled liquid chromatography apparatus, ARCA II. -.

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Section: Previous Chemical Studiesmentioning

confidence: 99%

Chemical Properties of Element 105 in Aqueous Solution: Halide Complex Formation and Anion Exchange into Triisoctyl Amine

et al. 1989

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“…Keller [8] The choice of experimental techniques is limited, however, by the short half-lives and low production rates of hahnium isotopes.…”

Section: Previous Chemical Studies {Gas Phase Thermochromatography)mentioning

confidence: 99%

Aqueous Chemistry of Element 105

et al. 1988

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Studies of the aqueous phase chemistry of hahnium (element 105) were performed on 34-s 262Ha produced by the 249Bk(18o,5n) reaction. The reaction products were subjected to various rapid aqueous phase chemical separation procedures. 262Ha was identified by measuring the energy and time .distribution of the alpha particles and fission fragments emitted in its decay.Time-correlated pairs of alpha particles from the decay of 262Ha and its 4.3-s daughter, 258Lr, were also measured. Hahnium was found to adhere to glass surfaces upon fuming with concentrated nitric acid, a property very characteristic of the group 5 elements, niobium and tantalum.In other experiments, the *visiting Miller Research Professor, Berkeley, spring 1987 1 extraction behavior of hahnium from mixed nitric acid I hydrofluoric acid solutions into methyl isobutyl ketone was found to be different from that of tantalum.

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“…This value is comparable to the 60% given by Stender et al [3] using the same aerosol but having a considerably shorter transportation distance of only a few meters. [28]). …”

Section: -Safety and Monitoring Systemsmentioning

confidence: 99%

The Saphir Gas-Jet and a First Application to an On-Line Separation of Niobium

et al. 1989

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A gas-jet system is described which has been installed at one of the external beam lines of the reactor SAPHIR. By means of a Boral chopper between the target chamber and beam line timed production of fission products can be achieved. In a first experiment this gas-jet system was used to develop a continuous and fast separation for short-lived isotopes of niobium with half-lives down to 7 s using isothermal gas chromatography in quartz columns. As reactive gas HBr^j was used.

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A History and Analysis of the Discovery of Elements 104 and 105

Cited by 37 publications

References 12 publications

Chemical Properties of Element 105 in Aqueous Solution: Halide Complex Formation and Anion Exchange into Triisoctyl Amine

Chemical Properties of Element 105 in Aqueous Solution: Halide Complex Formation and Anion Exchange into Triisoctyl Amine

Aqueous Chemistry of Element 105

The Saphir Gas-Jet and a First Application to an On-Line Separation of Niobium

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