On line ion exchange isolation of short lived Zr, Hf, Mo, Ta, and W isotopes as homologs of transactinide elements

The short-lived isotopes of W and their descendants have been isolated from from the nuclear reaction products arising in the bombardment of samarium target with 24Mg ions at the U-400 cyclotron of JINR-Dubna. Chemical separations were performed using previously elaborated fast and continuous ion exchange method. In the similar way were isolated products of 235U fission, obtained at the microtron MT-25 during irradiation of 235U with photo-neutrons. (authors). 1 fig., 3 refs