Spontaneous-fission decay properties and production cross-sections for the neutron-deficient nobelium isotopes formed in the 44, 48Ca + 204, 206, 208Pb reactions |
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| Authors: | AV Belozerov ML Chelnokov VI Chepigin TP Drobina VA Gorshkov AP Kabachenko ON Malyshev IM Merkin YuTs Oganessian AG Popeko RN Sagaidak AI Svirikhin AV Yeremin G Berek I Brida Š Šáro |
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| Institution: | (1) Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia, RU;(2) Comenius University, SK-84215 Bratislava, Slovakia, SK |
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| Abstract: | Heavy-ion fusion reactions 48Ca + 204Pb and 44Ca + 208Pb leading to the same compound nucleus 252No* were run in attempts to produce new neutron-deficient spontaneous-fission isotopes of 249,250No using the electrostatic separator VASSILISSA. Production cross-sections for the spontaneous-fission activities with the
half-lives 5.6 and 54 μs observed in these reactions are compared with the measured ones for the well-known isotopes of 251 - 255No formed in the heavy-ion fusion reactions 48Ca + 206Pb and 48Ca + 208Pb. The obtained excitation functions for the reaction products formed after the evaporation of 1-4 neutrons from the corresponding
compound No nuclei have been compared with similar data obtained earlier and results of statistical model calculations.
Received: 26 July 2002 / Accepted: 5 November 2002 / Published online: 18 March 2003
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ID="a"e-mail: eremin@sunvas.jinr.ru
Communicated by J. ?yst? |
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| Keywords: | PACS 21 10 Dr Binding energies and masses – 23 60 +e Alpha decay – 25 70 -z Low and intermediate energy heavy-ion reactions – 25 85 Ca Spontaneous fission |
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