 In May 2009 , the IUPAC / IUPAP Joint Working Party reported on the discovery of copernicium and acknowledged the discovery of the isotope 283Cn . This implied the de facto discovery of the livermorium @-@ 291 isotope , from the acknowledgment of the data relating to its granddaughter 283Cn , although the livermorium data was not absolutely critical for the demonstration of copernicium 's discovery . Also in 2009 , confirmation from Berkeley and the Gesellschaft für Schwerionenforschung ( GSI ) in Germany came for the flerovium isotopes 286 to 289 , immediate daughters of the four known livermorium isotopes . In 2011 , IUPAC evaluated the Dubna team experiments of 2000 – 2006 . Whereas they found the earliest data ( not involving 291Lv and 283Cn ) inconclusive , the results of 2004 – 2006 were accepted as identification of livermorium , and the element was officially recognized as having been discovered . 
