In this investigation the isotope effect of uranium in the system Dowex 50 resin/ α- hydroxyisobutyrate solution was studied by mass spectrometry. A recycle ion exchange column was used for the separation experiments. The dependence of the isotope effect on the pH value and on the concentration of the α-hydroxyisobutyrate solution used as eluent was investigated. In the case of a 0.07 ᴍ and a 0.22 ᴍ α-hydroxyisobutyrate solution the elementary separation factor of uranium was calculated to be 1.00019 and 1.00006, respectively. In both cases an enrichment of 235U in relation to 238U was found in the solution.In addition the distribution factor of the uranyl ions in the investigated system was determined in the pH range between 2 and 6. The distribution factor depends strongly on the pH value. With increasing pH values the distribution factor decreases.The results obtained for the elementary separation factor and the distribution factor are compared with other investigations.
Proton induced nuclear reaction / 236 U target / 234,235 Np and 236 Pu / Excitation function / Thick-target yield Summary. The production of 235 Np and 236 Pu by the reactions 236 U( p, 2n) 235 Np and 236 U( p, nβ − ) 236 Pu using the K-130 cyclotron of the University of Jyväskylä was investigated. The cross sections for the reactions were determined. Thicktarget yield curves were derived based on the cross sections. The results are discussed and compared with previous data on other reactions leading to the formation of the same end products. The thick-target yield of 235 Np in the 236 U( p, 2n) reaction is about 50 percent higher than the yield obtained in the 238 U( p, 4n) reaction leading to this nuclide at comparable particle energies. The purity of 236 Pu produced in the 236 U( p, nβ − ) reaction is more than ten times better than for earlier known as the purest reaction 237 Np( p, 2n + pnβ − ) 236 Pu.
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