Triaxial dynamics in the quadrupole-deformed rotor

TL;DR

This paper investigates the triaxial dynamics of quadrupole-deformed rotor models, revealing equivalences between rigid and irrotational types and analyzing their spectral and transition properties.

Contribution

It provides a detailed comparison of rigid and irrotational quadrupole-deformed rotor models, highlighting their spectral similarities and differences in transition behaviors.

Findings

Irrotational and rigid models match in level patterns at leading order of deformation.

The irrotational model with $eta=30^\u00b0$ is equivalent to the rigid model with $eta=60^\u00b0$.

Distinct E2 transition characters distinguish the two models.

Abstract

The triaxial dynamics of the quadrupole-deformed rotor model of both the rigid and the irrotational type have been investigated in detail. The results indicate that level patterns and E2 transitional characters of the two types of the model can be matched with each other to the leading order of the deformation parameter $\beta$. Especially, it is found that the dynamical structure of the irrotational type with most triaxial deformation ($\gamma=30^\circ$) is equivalent to that of the rigid type with oblate deformation ($\gamma=60^\circ$), and the associated spectrum can be classified into the standard rotational bands obeying the rotational $L(L+1)$-law or regrouped into a new ground- and $\gamma$-band with odd-even staggering in the new $\gamma$-band commonly recognized as a signature of the triaxiality. The differences between the two types of the model in this case are emphasized especially on the E2 transitional characters.