Main Decay Modes of Super Heavy Nuclei | 75210
International Research Journals

Educational Research

All submissions of the EM system will be redirected to Online Manuscript Submission System. Authors are requested to submit articles directly to Online Manuscript Submission System of respective journal.

Main Decay Modes of Super Heavy Nuclei


D N Poenaru

Several laboratories in the world, like GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt, Germany; JINR Dubna, Russia Nat. Livermore Lab., USA and RIKEN Japan are trying to produce super heavy (SH) nuclei with atomic numbers Z>118 using cold fusion reactions (with just one neutron-evaporation or hot fusion (with 3-4 evaporation neutrons) and 48Ca projectile beam. Until now the main decay modes of SHs, allowing identifying the new element were alpha decay (AD) and spontaneous fission (SF), with a clear advantage of using AD chains, leading to a well-known final nucleus. We would like to point out that in some cases with large atomic number Z (usually Z>120) cluster radioactivity (CR) may compete as well, opening a new opportunity in this field. In order to illustrate this new finding, we shall present the results of our calculations for the following nuclides: 297,299,300119 and 299,300,301,302120. 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 AD. 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 Yukawaplus-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 CR of 300,302120 we predict a branching ratio relative to AD of -0.10 and 0.49, respectively, meaning that it is worth trying to detect such kind of decay modes in competition with AD. Whenever possible we calculate the Q-values by using the latest experimental evaluation of the masses. Otherwise the W4 atomic mass model is our choice.

Share this article