Orateur
Takaharu Otsuka
(University of Tokyo / RIKEN)
Description
Shapes of heavy deformed nuclei are discussed from the viewpoint of the Monte Carlo Shell Model with realistic effective NN interactions. The prevailing triaxial shapes then emerge due to the nuclear tensor force, in contrast to the conventional picture of the prolate-shape dominance since 1950's. The triaxiality with $\gamma\sim9^\circ $ arises commonly for rare-earth nuclei around $^{166}$Er. The mechanism for the low-lying second 2$^+$ state is presented, and the relation to the Davydov model is mentioned. Possible new M1 mode due to the triaxiality is pointed out. Triaxial shapes of exotic Ne, Na and Mg isotopes are also discussed with the ab initio EEdf1 interaction for the sd-pf combined shell.
Author
Takaharu Otsuka
(University of Tokyo / RIKEN)
