Department of Physics and Astronomy

Nuclear and Particle Physics Seminar

Monday, January 17

12:30pm-1:30pm

Stevenson Center, Room 6333

Yongshou Chen

China Institute of Atomic Energy

Unified Shell Model Description

of Chiral and Wobbling Bands

The Reflection Asymmetric Shell Model (RASM) has been developed by means of the variational procedure and projection methods to describe the high spin states of octupole deformed nuclei. The Q - Q forces of quadrupole, octupole and hexadecapole as well as the monopole and quadrupole pairings are included in the shell model hamiltonian. The shell model space is spanned by a selected set of the simultaneous angular momentum- and parity- projected BCS multi-quasiparticle states which are intrinsically deformed. The general features of rotational octupole bands in even-even and odd-even nuclei can be interpreted and reproduced by the present model. Recently, triaxiality has been introduced into the frame work to achieve a unified shell model description of the Chiral and Wobbling bands in highly rotating nuclei. In the frame work of the shell model, the inclusion of the triaxiality, the three dimensional projection and up to six quasiparticle configurations make the theory powerful enough to study phenomena in highly rotating triaxial nuclei at a new level.