Fission of super-heavy elements: $^{132}$Sn-plus-the-rest, or $^{208}$Pb-plus-the-rest ?

TL;DR

This study investigates how doubly magic nuclei $^{132}$Sn and $^{208}$Pb influence the fission fragment mass distributions of super-heavy elements, using a dynamical Langevin approach across a range of nuclei.

Contribution

It provides a detailed analysis of the impact of these magic nuclei on fission fragment distributions in super-heavy elements, clarifying their effects in different mass regions.

Findings

$^{208}$Pb has a negligible effect on light super-heavy nuclei.

In heavy super-heavies, symmetric and asymmetric peaks are comparable.

Fragment mass distributions show peaks near $A_F$=208 for heavy super-heavy nuclei.

Abstract

In this work we try to settle down the controversial predictions on the effect of doubly magic nuclei $^{132}$Sn and $^{208}$Pb on the mass distributions of fission fragments of super-heavy nuclei. For this we have calculated the mass distribution of super-heavy nuclei from $^{286}$Cn to $^{306}$122 within the dynamical 4-dimensional Langevin approach. We have found that in "light" super-heavies the influence of $^{208}$Pb on the mass distributions is present but negligible small. In "heavy" super-heavies, Z=120-122, the (quasi)symmetric peaks and strongly asymmetric peaks at fragment mass $A_F$ close to $A_F$=208 are of comparable magnitude.