Fusion-fission probabilities, cross sections and structure notes of super-heavy nuclei

TL;DR

This paper evaluates fusion-fission probabilities and cross sections of superheavy nuclei using the FBD model, discusses structural effects like K-isomerism, and provides predictions for elements Z=119 and 120.

Contribution

It introduces the application of the Fusion by Diffusion model for predicting superheavy element production and systematically calculates nuclear properties using a microscopic-macroscopic approach.

Findings

FBD model effectively predicts known isotopes like Lv and Og.

Predictions for Z=119 and 120 are less optimistic.

Structural effects such as K-isomerism may enhance stability.

Abstract

Fusion - fission probabilities in the synthesis of heaviest elements are discussed in the context of the latest experimental reports. Cross sections for superheavy nuclei are evaluated using "Fusion by Diffusion" (FBD) model. Predictive power of this approach is shown for experimentally known Lv, Og isotopes and predictions given for Z=119,120. Ground state and saddle point properties as: masses, shell corrections, pairing energies and deformations necessary for cross section estimations are calculated systematically within the multidimensional microscopic - macroscopic method based on the deformed Woods-Saxon single particle potential. In the frame of FBD approach predictions for production of elements heavier than Z = 118 are not too optimistic. For this reason, and because of high instability of superheavy nuclei, we comment on some structure effects, connected with the K-isomerism phenomenon which could lead to a significant increase in the stability of these systems.