Possible decay chains of superheavy nuclei in forthcoming experiments

Production of superheavy (SH) nuclei with Z>118 is the next goal of several laboratories who have been active until now in this field, e.g. GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt, Germany, JINR Dubna, Russia, Nat. Livermore Lab., USA, and RIKEN Japan. We would like to investigate the competition of three decay modes, α decay (αD), cluster radioactivities (CR), and spontaneous fission (SF) of the following nuclides: ^297,299,300119 and ^{299,300,301,302}120. The most reliable method to identify a new SH is by αD chains leading to well known final nuclei. Nevertheless, sometimes the main decay mode could be SF, and this may complicate the experiments. For heavier SHs, e.g. Z>120 it is possible that even CR may compete. We are using mainly the following models: ASAF (Analytical Super-Asymmetric Fission); UNIV (Universal Formula), and semFIS (Semi-empirical formula based on Fission Theory) to study αD. ASAF and UNIV are useful for CR. A dynamical model based on cranking inertia tensor allows us to calculate SH half-lives. Strutinsky's macroscopic-microscopic method with Yukawa-plus-exponential (Y+EM) liquid drop and the best two-center shell model are necessary to calculate the total deformation energy. For pairing we have to solve the BCS system of two equations. For ³⁸Sr cluster radioactivity of ^300,302120 we predict a branching ratio relative to α decay of -0.10 and 0.49, respectively, meaning that it is worth trying to detect such kind of decay modes in competition with α decay. Whenever possible we calculate the Q-values by using the latest experimental evaluation of the masses [Chinese Physics C 41 (2017) 030003]. Otherwise the W4 atomic mass model [Phys. Lett. B 734 (2014) 2215] is our choice. This document is composed of an abstract and the slides of the presentation. (authors)