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Short-Lived Isotopes of Transfermium Elements: Studying Characteristics of Spontaneous Fissioning

Jul 4, 2018
5 pages
Published in:
  • Bull.Russ.Acad.Sci.Phys. 82 (2018) 6, 632-636,
  • Izv.Ross.Akad.Nauk Ser.Fiz. 82 (2018) 6.
  • Published: Jul 4, 2018
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Abstract: (Springer)
series of experiments performed in 2014–2015 using the SHELS separator and a beam of multicharged ions from the U-400 accelerator at the Flerov Laboratory of Nuclear Reactions (Joint Institute for Nuclear Research) in Dubna is described. In preparation for a large program of experiments with a beam of highly charged ions of50^{50}Ti, an experiment is performed to study the spontaneous fissioning (SF) of short-lived neutron-deficient isotope256^{256}Rf formed in complete fusion reaction50^{50}Ti +208^{208}Pb =256^{256}Rf + 2n. The half-life of256^{256}Rf is measured along with the probability of its SF decay. The average number of neutrons per one event of256^{256}Rf SF ( vˉ\bar v = 4.47 ± 0.09) is obtained for the first time. The results from experiments to study the SF of short-lived neutron-deficient isotopes synthesized in complete fusion reaction48^{48}Ca +204^{204}Pb →252^{252}No* are presented as well. Two short-lived activities attributed to the SF of the ground and isomeric states of250^{250}No are revealed. The half-life, total kinetic energies of fission fragments, and neutron multiplicities are measured for the obtained short-lived nuclei. The average numbers of neutrons per one SF event are vˉ\bar v = 4.38 ± 0.13 and vˉ\bar v = 3.90 ± 0.20, respectively, for SF activity with t1/2_{1/2} = 5.1 ± 0.3 and t1/2_{1/2} = 36 ± 3 μs.