Triaxial rotor

Level introduced in [01Ga25] in addition to NDS [930hl2] see there a comparison of experimental data with predictions of the Rigid Triaxial Rotor plus Particle model (RTRP) and with data for other A-odd Xe isotopes. 

Nevertheless, one cannot exclude the possibility that rigid triaxial rotors exist in nature. An example is the nucleus Ge, for which the potential energy surface calculations, as well as the level spectra and 5(E2) values alike demonstrate the occurrence of stable triaxial deformation (Larsson et al. 1976 Ragnarsson et al. 1978). 

In the triaxial deformation region a lot more collective states occur than in the region of axially symmetric rotor. These states are characterized by strong intraband and weak interband transitions. The nucleus may perform wobbling motion. Parallel to the yrast line many rotational bands may exist and also band-crossings, producing sudden changes of the moment of inertia. 

Sm, with some other nuclei, represents an intermediate situation, the X(5) symmetry in the coexistence region between the harmonic vibrator and axially symmetric rotor (O Fig. 2.27d). At the triple point (r/t) shape transition is possible from spherical to axially symmetric oblate iP < 0) or prolate (P > 0) shapes. A good candidate for the triple point behavior is From the triple point, transition is possible also to the triaxial shape (Jolos 2004). 

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