Author: C. Morse |  Citation: Nucl. Data Sheets 182, 167 (2022) |  Cutoff date: 14-Sep-2021 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-2682 keV SYS(n)= 5400 keV SYS(p)= 4173 keV SYQ(α)= 9388 keV SY
Reference: 2021WA16

  A  289Fl α decay (2.4 S) 

General Comments:

$ 285Cn has been observed as the α-decay daughter of 289Fl at JINR (2000Og05,2002Og09,2004Og07), GSI (2011Ga19,2012Ho12), and RIKEN (2017Ka66); and in gas-phase chemistry experiments at JINR (2010Wi14) and GSI (2014Ya33). Events were identified based on the observation of time- and position-correlated α-decay chains terminated by spontaneous fission. The decay properties of the chains were compared to those known in the literature to assign each decay to specific nuclei.

$ Other: One decay chain containing 285Cn is reported in 1999Og10, but these results have not been reproduced.

$ Half-lives, branching ratios, and α-decay energies in this evaluation have been computed from the individual events listed in the references above. Half-life uncertainties have been computed according to the method of 1984Sc13. An additional 10 keV systematic uncertainty is assumed for the α-decay energies, which is added in quadrature to the averaged statistical uncertainty.

Q-value: ΔQ(β-)=926, ΔS(n)=915, ΔS(p)=712, ΔQ(α)=116 (2021Wa16)

Q-value: S(2n)=12393 syst 797, S(2p)=7321 syst 712 (2021Wa16)

XREF T1/2(level)
  0A 33 s +10-6 
% α = 100
% SF < 6

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Additional Level Data and Comments:


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