Authors:L. Guseva, Z. Szeglowski, Dinh-Thi Lien, B. Kubica, G. Tikhomirova, and S. Timokhin
On-line chemistry studies of short-lived isotopes of Os and Re, as homologs of 108 (Hs) and 107 (Bh), respectively, produced
in the nuclear reactions at the (LNR, Dubna) cyclotron have been carried out. It was shown, that Os and Re are not sorbed
on cation exchangers, but very strongly sorbed on anion exchangers from diluted HCl solutions. Re is also retained by a TOPO
containing sorbent and may be separated from Os. The possibilities of chemical species and oxidation states investigation
of short-lived transactinide elements by continuous chromatography have been shown.
Authors:Z. Szeglowski, Dinh-Thi Lien, L. Guseva, S. Timokhin, B. Kubica, and G. Tikhomirova
Ion-exchange behavior of Re and Os as homolgs of Bh and Hs, respectively, has been studied in the sulfuric acid media. The distribution coefficients of 183Re and 185Os as well as of other radionuclides between Dowex-50 and H2SO4 solutions were determined as a function of the acid concentration. It was shown, that cation-exchange column may be used for the separation of Os, Re and W from elements of III group, whereas anion-exchange column for their concentration from diluted sulfuric acid solutions. The 0.05M H2SO4 was used for continuous on-line separation of short-lived Os isotopes produced in the nuclear reactions: nat.Dy(20Ne, xn)Os. Radionuclides of Os, Re and W were strongly sorbed on anion-exchange column only.
Authors:Z. Szeglowski, L. Guseva, Dinh Thi Lien, V. Domanov, B. Kubica, G. Tikhomirowa, O. Constantinescu, M. Constantinescu, and A. Yakushev
The short-lived isotopes of W and their descendants have been separated from nuclear reaction products arising in the bombardment
of samarium target with24Mg ions at the U-400 cyclotron of JINR-Dubna. Chemical separations were performed using previously elaborated fast and continuous
ion exchange. In similar way products of235U fission, obtained at the microtron MT-25 during irradiation of235U target with photoneutrons were separated.
Authors:Z. Szeglowski, H. Bruchertseifer, V. Brudanin, G. Buklanov, O. Constantinescu, Dinh Lien, V. Domanov, L. Guseva, M. Hussonnois, G. Tikhomirowa, I. Zvara, and Yu. Oganessian
Some short-lived isotopes of Hf, Ta and W, synthesized at the U-400 cyclotron of JINR-Dubna, have been isolated using a previously elaborated fast continuous method of chemical isolation of element 104 from nuclear reaction products. The products were transported by a NaCl aerosol jet, from the irradiated targets to a separation device in which Hf, Ta and W were isolated by using three coupled ion-exchange columns.
Authors:Z. Szeglowski, H. Bruchertseifer, V. Brudanin, G. Buklanov, O. Constantinescu, Dinh Thi Lien, V. Domanov, L. Guseva, M. Hussonnois, G. Tikhomirova, I. Zvara, and Yu. Oganessian
The short-lived isotopes of W and their descendants have been isolated from the products of the bombardment of144Sm with24Mg by a fast continuous ion-exchange method, using HF solution media. The feasibility of this method for isolation of element 106 is discussed.
Authors:D. Schumann, R. Dressler, St. Taut, H. Nitsche, Z. Szeglowski, B. Kubica, L. Guseva, G. Tikhomirova, A. Yakushev, O. Constantinescu, V. Domanov, M. Constantinescu, Dinh Lien, Yu. Oganessian, V. Brudanin, I. Zvara, and H. Bruchertseifer
The title goal was achieved using a DOWEX 50Wx8 cation exchange column saturated with La(OH)3 and ammonia solution as eluent. Hf, Ta and Lu were adsorbed on this column, whereas W remained in the solution. This chemical system may be used for fast on-line separations of element 106.