Alpha decay and cluster radioactivity of heavy superheavy nuclei

Superheavy nuclei of interest for the forthcoming synthesis of the isotopes with Z = 119,120 are investigated. One of the very interesting experiment was performed at the velocity filter SHIP (GSI Darmstadt) trying to produce 299120 in a fusion reaction 258Cm(54Cr,3n)299120. We report calculations of alpha decay half-lives using four models: AKRA (Akrawy), ASAF (Analytical Super-Asymmetric Fis-sion), UNIV (Universal Formula), and semFIS (Semi-empirical formula based on Fis-sion Theory). The released energy, Q, is calculated using the theoretical model of atomic masses WS4, see Phys. Rev. C 84 (2011) 014333 and Phys. Lett. B 734 (2014) 215. For 92,94Sr cluster radioactivity of 300,302120 we predict a branching ratio rela-tive to alpha decay of -0.10 and 0.49, respectively, which is expected to be measured in a forthcoming experiment.