Magnetic rotations in 198Pb and 199Pb within covariant density functional theory

TL;DR

This paper uses covariant density functional theory to successfully model magnetic rotation in 198Pb and 199Pb, reproducing experimental spectra, transition probabilities, and the shears mechanism.

Contribution

It demonstrates that covariant density functional theory can accurately describe magnetic rotation phenomena in lead isotopes, aligning well with experimental data and phenomenological models.

Findings

Good agreement with experimental energy spectra and transition probabilities.

Confirmation of the shears mechanism and large B(M1) transitions decreasing with spin.

Successful microscopic, self-consistent description of magnetic rotation.

Abstract

Well-known examples of shears bands in the nuclei 198Pb and 199Pb are investigated within tilted axis cranking relativistic mean-field theory. Energy spectra, the relation between spin and rotational frequency, deformation parameters and reduced $M1$ and $E2$ transition probabilities are calculated. The results are in good agreement with available data and with calculations based on the phenomenological pairing plus-quadrupole-quadrupole tilted-axis cranking model. It is shown that covariant density functional theory provides a successful microscopic and fully self-consistent description of magnetic rotation in the Pb region showing the characteristic properties as the shears mechanism and relatively large B(M1) transitions decreasing with increasing spin.