Toroidal high-spin isomers in light nuclei with N not equal to Z

TL;DR

This paper predicts and analyzes the existence of toroidal high-spin isomeric states in light nuclei with N not equal to Z, extending previous findings to a broader mass range using cranked Skyrme-Hartree-Fock calculations.

Contribution

It demonstrates the occurrence of N not equal to Z toroidal high-spin isomers in light nuclei, revealing systematic properties and specific examples within the mass range 28 to 52.

Findings

Identification of N not equal to Z toroidal high-spin isomers in specific nuclei.

Systematic patterns similar to N=Z isomers observed in N not equal to Z cases.

Examples include $^{36}_{16}$S and $^{40}_{18}$Ar with high angular momentum.

Abstract

The combined considerations of both the bulk liquid-drop-type behavior and the quantized aligned rotation with cranked Skyrme-Hartree-Fock approach revealed previously [Phys. Lett. B 738 (2014) 401] that even-even, N=Z, toroidal high-spin isomeric states have general occurrences for light nuclei with A between 28 and 52. We find that in this mass region there are in addition N not equal to Z toroidal high-spin isomers when the single-particle shells for neutrons and protons occur at the same cranked frequency $\hbar \omega$. Examples of N not equal to Z toroidal high-spin isomers, $^{36}_{16}$S$_{20}$($I$=74$\hbar$) and $^{40}_{18}$Ar$_{22}$($I$=80,102$\hbar$), are located and examined. The systematic properties of these N not equal to Z toroidal high-spin isomers fall into the same regular (muti-particle)-(muti-hole) patterns as other N=Z toroidal high-spin isomers.