 Two further atoms were reported by the institute during their second experiment during April – May 2001 . In the same experiment they also detected a decay chain which corresponded to the first observed decay of flerovium in December 1998 , which had been assigned to 289Fl . No flerovium isotope with the same properties as the one found in December 1998 has ever been observed again , even in repeats of the same reaction . Later it was found that 289Fl have different decay properties and that the first observed flerovium atom may have been its nuclear isomer 289mFl . The observation of 289mFl in this series of experiments may indicate the formation of a parent isomer of livermorium , namely 293mLv , or a rare and previously unobserved decay branch of the already @-@ discovered state 293Lv to 289mFl . Neither possibility is certain , and research is required to positively assign this activity . 
