Andrey Semchenkov

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The electron shell structure of superheavy elements, i.e., elements with atomic number Z ≥ 104, is influenced by strong relativistic effects caused by the high Z. Early atomic calculations on element 112 (copernicium, Cn) and element 114 (flerovium, Fl) having closed and quasi-closed electron shell configurations of 6d(10)7s(2) and 6d(10)7s(2)7p1/2(2),(More)
The analysis of a large body of heavy ion fusion reaction data with medium-heavy projectiles (6 < or = Z < or = 18) and actinide targets suggests a disappearance of the 3n exit channel with increasing atomic number of the projectile. Here, we report a measurement of the excitation function of the reaction (248)Cm ((26)Mg,xn)(274-x)Hs and the observation of(More)
The fusion-evaporation reaction 244Pu(48Ca,3-4n){288,289}114 was studied at the new gas-filled recoil separator TASCA. Thirteen correlated decay chains were observed and assigned to the production and decay of {288,289}114. At a compound nucleus excitation energy of E{*}=39.8-43.9  MeV, the 4n evaporation channel cross section was 9.8{-3.1}{+3.9}  pb. At(More)
M. Schädel, D. Ackermann, L.-L. Andersson, J. Ballof, M. Block, R.A. Buda, W. Brüchle, I. Dragojevi , Ch.E. Düllmann, J. Dvorak, K. Eberhardt, J. Even, J.M. Gates, J. Gerl, A. Gorshkov, P. Golubev, R. Graeger, K.E. Gregorich, E. Gromm, W. Hartmann, F.P. Heßberger, D . Hild, R. Hoischen, A. Hübner, E. Jäger, J. Khuyagbaatar, B. Kindler, I. Kojouharov, J.V.(More)
CHEM-SHE-01 On the production and chemical separation of Hs (element 108) 183 Experiment Proposal Number: U205 Authors: Dvorak, J.; Krücken, R.; Nebel, F.; Novackova, Z.; Türler, A.; Wierczinski, B.; Yakushev, A.; Brüchle, W.; Jäger, E.; Schimpf, E.; Schädel, M.; Semchenkov, A.; Kuznetsov, A.; Chelnokov, M.; Yeremin, A.; Düllmann, C. E.; Nagame, Y.;(More)
L.-L. Andersson1, D. Rudolph1, P. Golubev1, R. Hoischen1,2, E. Merchán1,3, D. Ackermann2, Ch.E. Düllmann2, J. Gerl2, F.P. Heßberger2, E. Jäger2, J. Khuyagbaatar2, I. Kojouharov2, J. Krier2, N. Kurz2, W. Prokopowicz2, M. Schädel2, H. Schaffner2, B. Schausten2, E. Schimpf2, A. Semchenkov2,4, H.-J. Wollersheim2, A. Türler4, A. Yakushev4, K. Eberhardt5, J.(More)
L.-L. Andersson1, D. Rudolph2, D. Ackermann3, Ch.E. Düllmann3, K. Eberhardt4, J. Even4, U. Forsberg2, J. Gellanki2, J. Gerl3, P. Golubev2, R. Hoischen2,3, R.-D. Herzberg1, F.P. Heßberger3, E. Jäger3, J. Khuyagbaatar3, I. Kojouharov3, J.V. Kratz4, J. Krier3, N. Kurz3, E. Merchán3, W. Prokopowicz3, M. Schädel3, H. Schaffner3, B. Schausten3, E. Schimpf3, A.(More)
The scientific program at the TASCA gas-filled separator [1] requires the highest possible UNILAC beam intensities. Presently, they are of the order of one particle microampere and a significant increase is in preparation. To make use of these intensities a windowless differential pumping system (DPS) was installed and a computer program was developed to(More)
Theoretical calculations predict 270Hs (Z=108, N=162) to be a doubly magic deformed nucleus, decaying mainly by alpha-particle emission. In this work, based on a rapid chemical isolation of Hs isotopes produced in the 26Mg+248Cm reaction, we observed 15 genetically linked nuclear decay chains. Four chains were attributed to the new nuclide 270Hs, which(More)