Monopole and Quadrupole Giant Resonances in Rotating Triaxially Deformed Nuclei

Abstract

Isoscalar monopole and quadrupole giant resonances in rotating triaxially deformed nuclei are studied by means of the RPA based on the rotating shell model. The deformation parameters are selfconsistently determined as functions of rotational frequency, and the doubly stretched monopole and quadrupole forces are used as residual interactions. It is found that the properties of these modes–the excitation energies, the splitting and the mixing of the strength–predicted by the harmonic-oscillator potential model are well realized in the realistic calculation. The result indicates that the high frequency rotations affect the properties of these giant resonances mainly through the change of the deformation paramenters.