The investigation of properties of short-lived SF isotopes (Z > 100) at the focal plane of VASSILISSA separator
1 Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia
2 Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia
3 V.G. Khlopin Radium Institute, 194021 St. Petersburg, Russia
4 Manipal University, Madhav Nagar, Manipal, 576104 Karnataka, India
5 Institute for Nuclear Research and Nuclear Energy, 1784 Sofia, Bulgaria
6 Laboratory for Accelerator-Based Sciences, 7129 Somerset West, South Africa
Published online: 13 December 2013
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 ν̅ = 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 (ν̅ = 3.3 ± 0.3) and (ν̅ = 3.55 ± 0.50), respectively. Both values are determined for the first time.
© Owned by the authors, published by EDP Sciences, 2013
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