Observations of super heavy nuclei at the Island of Stability with actinide targets and ORNL-UTK digital detection system at JINR Dubna by the JINR-ORNL-UTK-LLNL-Vanderbilt collaboration*

The observations of decay chains of flerovium and oganesson isotopes will be presented. The experiments utilized the DGFRS at Dubna, unique actinide target materials from ORNL REDC, and a highly segmented recoil-decay digital detection system. The targets were made out of 239Pu, 240Pu and of mixed californium with 249Cf, 250Cf and 251Cf content recovered from decayed 252Cf sources were irradiated by an intense 48Ca beam at JINR Dubna. The signals from all detectors were analyzed in parallel by digital and analog data acquisition systems. Decays of 285Fl, 284Fl [1,2]and of 294Og [3] were detected. The prospects for reaching new isotopes 295Og and 296Og will discussed. The enrichment of 251Cf target material might enable an ultimate experiment with 58Fe beam leading to the new nucleus 308(124) having a magic neutron number N=184.  1. Utyonkov et al, PR C 92, 034609, 2015.  2. Utyonkov et al, PR C 97, 014320, 2018.  3. Brewer et al, Phys. Rev. C, submitted.