Neutron multiplicity at spontaneous fission of 246Fm

The neutron-deficient isotope 246Fm , produced in the complete fusion reaction40Ar$ + $208Pb, was investigated. The main goal of the experiment was to determine the neutron multiplicity at spontaneous fission of this isotope. For experiments aimed at the study of spontaneous fission of transfermium nuclei improvements in the focal plane detector system of recoil separator VASSILISSA have been made. A neutron detector consisting of 54 3He -filled counters has been mounted around the focal-plane detector chamber. From the experimental data the average number of neutrons per spontaneous fission of 246Fm was determined ($ \bar{{\nu}}$ = 3.55±0.5) .

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