In-beam spectroscopy of medium- and high-spin states in $^{133}$Ce

TL;DR

This study extends the level scheme of $^{133}$Ce to high energies and spins, revealing multiple bands and triaxial shapes through experimental data and theoretical models.

Contribution

It provides new high-spin level data and confirms triaxiality in $^{133}$Ce using advanced experimental and theoretical techniques.

Findings

Extended level scheme up to 22.8 MeV and spin 93/2

Identified 11 quadrupole and 2 dipole bands

Confirmed pronounced triaxiality in all observed bands

Abstract

Medium and high-spin states in $^{133}$Ce were investigated using the $^{116}$Cd($^{22}$Ne, $5n$) reaction and the Gammasphere array. The level scheme was extended up to an excitation energy of $\sim22.8$ MeV and spin 93/2 . Eleven bands of quadrupole transitions and two new dipole bands are identified. The connections to low-lying states of the previously known, high-spin triaxial bands were firmly established, thus fixing the excitation energy and, in many cases, the spin parity of the levels. Based on comparisons with cranked Nilsson-Strutinsky calculations and tilted axis cranking covariant density functional theory, it is shown that all observed bands are characterized by pronounced triaxiality. Competing multiquasiparticle configurations are found to contribute to a rich variety of collective phenomena in this nucleus.