Author: C. Morse |  Citation: Nucl. Data Sheets 182, 130 (2022). |  Cutoff date: 14-Sep-2021 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-3226 keV SYS(n)= 5560 keV SYS(p)= 3694 keV SYQ(α)= 9888 keV SY
Reference: 2021WA16

  A  287Fl α decay (0.4 S) 

General Comments:

$ 283Cn has been observed as the product of the 238U(48Ca,3n) reaction at GSI (2007Ho18) and RIKEN (2017Ka31); as the α-decay product of 287Fl at GSI (2012Ho12), LBNL (2009St21), and JINR (2004Og12,2004Og07,2006Og05); and in gas-phase chemistry experiments JINR (2007Ei03,2008Ei03,2010Ei01). In all cases, the nuclei were identified based on the observation of time- and position-correlated chains of α decays, terminated by spontaneous fission. Comparison of the observed decay properties to those previously observed allowed the members of the chains to be assigned to known nuclei.

$ 2016Ho09 revises the assignment of chain #1 in 2012Ho12 to have 291Lv as its progenitor, which decays through 283Cn. 2016Ho09 also suggests that the "missing α " events in 2004Og12 are actually spontaneous fission of 283Cn. This revision is adopted here except for the third entry in Table III of 2004Og12.

$ Other: 1999Og07, 1999Og05, 2004Og02 claim observation of 283Cn, but the properties of the decay chains identified in these works do not agree with subsequent publications.

$ 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-)=754, ΔS(n)=824, ΔS(p)=851, ΔQ(α)=113 (2021Wa16)

Q-value: S(2n)=12753 syst 732, S(2p)=6514 syst 788 (2021Wa16)

XREF T1/2(level)
  0A 4.6 s +10-7 
% α = 85
% SF = 15

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Additional Level Data and Comments:


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