Abstract
The shell structure of heavy nuclei with Z > 104, which can be produced in actinide-based complete fusion reactions, is studied with a modified two-center shell model. Using the macroscopic-microscopic approach, mass excesses and Q α -values are calculated and compared with available experimental data. The production cross sections of new superheavy nuclei decisively depend on the position of the proton shell closure.
Highlights
The experiments on complete fusion reactions with 48 Ca beam and various actinide targets were successfully carried out at FLNR (Dubna), GSI (Darmstadt), and LBNL (Berkeley) [1,2,3,4,5,6] in order to synthesize superheavy nuclei with Z = 112 − 118
In Ref. [16] we proposed a microscopic-macroscopic approach based on the two-center shell model (TCSM) [17]
The value of survival probability strongly depends on B f − Bn, the difference between the height B f of the fission barrier and the neutron separation energy Bn
Summary
The found experimental trend of the nuclear properties (Qα -values and half-lives) and cross sections of the superheavy elements (SHE) produced with Ca-induced reactions reveals the increasing stability of nuclei approaching the spherical closed neutron shell N = 184, and indicates a relatively small effect of the proton shell at Z = 114 [7, 8]. There is a hope to synthesize new SHE with Z ≥ 119 by using the present experimental set-ups and actinide-based reactions with neutron-rich stable projectiles heavier than 48 Ca. Modified microscopic-macroscopic approach
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