Svirikhin, Alexandr and Andreev, Alexander and Dushin, Victor and Chelnokov, M.L and Chepigin, Victor and Gupta, M and Isaev, Andrey and Izosimov, Igor and Katrasev, D.E and Kuznetsov, A.N and Malyshev, O.N and Minkova, Ani and Mullins, S and Popeko, A.G and Sokol, E.A and Yeremin, Alexander (2013) The investigation of properties of short-lived SF isotopes (Z 100) at the focal plane of VASSILISSA separator. In: EPJ Web of Conferences 62, 03005 (2013).

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Abstract

For experiments aimed at the study of spontaneous fission of transfermium nuclei improvements in the focal plane detector system of recoil separator VASSILISSA have been made. A neutron detector consisting of 54 3He-filled counters has been mounted around the focal-plane detector chamber. The reaction 48Ca +206Pb = 2n +252No is used for tuning the separator settings and calibrating the detector system with the spontaneous fission of the 252No. The average neutron number per 252No spontaneous fission event is as large as ¯ν = 4.06 ± 0.12. The short-lived heavy isotopes 244,246Fm, produced in the complete fusion reactions 40Ar +206,208Pb, are investigated. The average number of neutrons per spontaneous fission of 244,246Fm from the experimental data were ( ¯ν = 3.3 ± 0.3) and ( ¯ν = 3.55 ± 0.50), respectively. Both values are determined for the first time

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