On-line separation of short-lived tungsten isotopes from tantalum, hafnium and lutetium by adsorption on ion exchangers from aqueous ammonia solution

Schumann, D.; Dressler, R.; Taut, Steffen; Nitsche, H.; Szeglowski, Ζ.; Kubica, Β.; Guseva, L. I.; Tikhomirova, G. S.; Yakushev, A.; Constantinescu, O.; Domanov, V. P.; Constantinescu, M.; Lien, Dinh Thi; Oganessian, Yu. Ts.; Brudanin, V.; Zvára, I.; Bruchertseifer, H.

doi:10.1007/bf02165053

Cited by 9 publications

(3 citation statements)

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“…Literature data show that carrier-free tungsten isotopes form anionic compounds in ammonia solution which are not coprecipitated with La(OH) 3 [17]. Anionic monomeric species of W and Mo are formed already at pH 3.7 [18], and from calculations, the same behavior with only slight differences is expected for Sg [19].…”

Section: Seaborgiummentioning

confidence: 85%

Chemical procedure applied for the identification of Rf/Db produced in the ⁴⁸Ca +²⁴³Am reaction

Schumann¹

2005

Radiochimica Acta

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Element 115 / Dubnium / Rutherfordium / Aqueous chemistry / Fluoride complexes Summary.A chemical separation procedure for Rf/Db is described which was applied to a long-lived decay product from the nuclear fusion reaction 48 Ca + 243 Am . A 1.2 mg thick 243 Am target was bombarded by 247 MeV 48 Ca particles. The recoiling products were collected in a thick Cu catcher for about one day and then subjected to a chemical separation procedure that included an ion exchange from dilute HF solutions. Final samples were prepared on 30 µg/cm 2 thick polyethylene (PE) foils and counted in 4π-geometry for α-particles and spontaneous fission (SF) coincidences. The detector arrays were surrounded by 3 He detectors to also assay prompt neutrons. Decontamination factors from actinides of about 10 5 were achieved. Group 6 (W) to 14 (Pb) elements as models for their heavier homologues were shown to be separated from the Rf/Db fraction with more than 90%. In eight final samples, representing a total beam dose of 3.4 × 10 18 particles, 15 SF events were detected. The decay pattern points to a single component with a half-life of ≈ 32 h, which shows a chemical behavior similar to the lighter homologues of group 4 and 5 elements.

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Section: Seaborgiummentioning

confidence: 85%

Chemical procedure applied for the identification of Rf/Db produced in the ⁴⁸Ca +²⁴³Am reaction

Schumann¹

2005

Radiochimica Acta

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“…First, the gas-jet passed a degasser system which was slightly modified with respect to the device described in [8] : in order to decrease the transport time from the target chamber to the detector position two instead of four filters inside the degasser were used. This decreased the chemical yield to 25%, but lowered the transport time from the production site to the detector to 20 s.…”

Section: Methodsmentioning

confidence: 99%

“…Under these conditions the tungsten fraction passed the cation exchange column and could be adsorbed on a following DOWEX 1X8 (200-400 mesh) column. Details of the chemical set-up and the column preparation are given in [8]. With this setup it was possible to detect isotopes with half-lives down to about 5 s.…”

Section: Methodsmentioning

confidence: 99%

Rapid Communication: First Observation of y-Ray Emission Assigned to the Decay of 164W

et al. 1997

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Radiochemistry and radiochemical separations

Bujdosó

1999

J Radioanal Nucl Chem

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On-line separation of short-lived tungsten isotopes from tantalum, hafnium and lutetium by adsorption on ion exchangers from aqueous ammonia solution

Cited by 9 publications

References 3 publications

Chemical procedure applied for the identification of Rf/Db produced in the ⁴⁸Ca +²⁴³Am reaction

Chemical procedure applied for the identification of Rf/Db produced in the ⁴⁸Ca +²⁴³Am reaction

Rapid Communication: First Observation of y-Ray Emission Assigned to the Decay of 164W

Radiochemistry and radiochemical separations

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On-line separation of short-lived tungsten isotopes from tantalum, hafnium and lutetium by adsorption on ion exchangers from aqueous ammonia solution

Cited by 9 publications

References 3 publications

Chemical procedure applied for the identification of Rf/Db produced in the 48Ca +243Am reaction

Chemical procedure applied for the identification of Rf/Db produced in the 48Ca +243Am reaction

Rapid Communication: First Observation of y-Ray Emission Assigned to the Decay of 164W

Radiochemistry and radiochemical separations

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Chemical procedure applied for the identification of Rf/Db produced in the ⁴⁸Ca +²⁴³Am reaction

Chemical procedure applied for the identification of Rf/Db produced in the ⁴⁸Ca +²⁴³Am reaction