Work had also been done at the Joint Institute for Nuclear Research in Dubna, Russia from 1998 to synthesise the heavier isotope Cn in the hot fusion reaction U(Ca,3n) Cn; most observed atoms of Cn decayed by spontaneous fission, although an alpha decay branch to Ds was detected. While initial experiments aimed to assign the produced nuclide with its observed long half-life of 3 minutes based on its chemical behaviour, this was found to be not mercury-like as would have been expected (copernicium being under mercury in the periodic table), and indeed now it appears that the long-lived activity might not have been from Cn at all, but its electron capture daughter Rg instead, with a shorter 4-second half-life associated with Cn. (Another possibility is assignment to a metastable isomeric state, Cn.) While later cross-bombardments in the Pu+ Ca and Cm+ Ca reactions succeeded in confirming the properties of Cn and its parents Fl and Lv, and played a major role in the acceptance of the discoveries of flerovium and livermorium (elements 114 and 116) by the JWP in 2011, this work originated subsequent to the GSI's work on Cn and priority was assigned to the GSI.