Search for new isotopes of element 112 by irradiation of 238U with 48Ca

Yu Ts Oganessian, A. V. Yeremin, G. G. Gulbekian, S. L. Bogomolov, V. I. Chepigin, B. N. Gikal, V. A. Gorshkov, M. G. Itkis, A. P. Kabachenko, V. B. Kutner, A. Yu Lavrentev, O. N. Malyshev, A. G. Popeko, J. Roháč, R. N. Sagaidak, S. Hofmann, G. Münzenberg, M. Veselsky, S. Saro, N. IwasaK. Morita

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The reaction 48Ca+238U was investigated at the recoil separator VASSILISSA at the Flerov Laboratory of Nuclear Reactions, JINR Dubna, in attempts to synthesize new isotopes of element 112. The experiments were performed at two beam energies resulting in excitation energies of the compound nucleus of 33 and 39 MeV. The collected beam dose was 3.5×1018 and 2.2×1018, respectively. Two spontaneous fission events were observed at the lower beam energy, which tentatively were assigned to the new neutron rich isotope 283112 produced in the reaction 238U(48Ca,3n)283112. The measured cross-section is (5.0 +6.3-3.2) pb and the half-life is (81 +147-32) s. No event was observed at the higher beam energy resulting in the upper cross-section limit of 7.3 pb.

Original languageEnglish
Pages (from-to)63-68
Number of pages6
JournalEuropean Physical Journal A
Issue number1
Publication statusPublished - 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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