Monopole and Quadrupole Giant Resonances in Rotating Triaxially Deformed Nuclei. II: A Microscopic Description of the Isoscalar and Isovector Modes

Abstract

Microscopic calculations are performed for the isoscalar and isovector monopole and quadrupole giant resonances built on high-spin yrast states. The results of the calculation show that the shapes of the strength functions for both the isoscalar and isovector vibrations are determined mainly by the deformation parameters of the mean field. The effects of rotation on the isoscalar and isovector quadrupole modes are found to be quite different: The rotation-splittings of the former become significant at very high-spins, while those of the latter remain small. It is also demonstrated that the. transformation of the strength functions from the rotating frame into the laboratory frame is crucial to accurately evaluate the rotation­ splittings of the quadrupole modes.