Multiple chiral bands in 193Tl

[摘要] ENGLISH ABSTRACT : In order to extend knowledge about chirality in A ∼ 190 mass region, experiments were performedat iThemba LABS for γ−spectroscopy studies in 192,193Tl. Previous level scheme of193Tl was considerably modified and extended. Level scheme of 192Tl was also significantlyextended. Spins and parities were assigned to most of the levels. The yrast band in 192Tlis associated with πh9/2⊗νi13/2 configuration which is suitable for chiral symmetry. A sideband with close excitation energies was observed, suggesting that the two bands in 192Tlmight form a chiral pair. More interestingly three bands in 193Tl have similar properties andwere associated with the same πh9/2 ⊗νi13/22. These bands might represent a multiplet ofchiral bands in 193Tl. Theoretical calculations using the Cranked Nilsson-Strutinsky (CNS)model, the multi-particle rotor (MPR) model, and the two-quasiparticle-plus-triaxial rotormodel (TQPRM) support the presence of chiral symmetry in 192,193Tl.

[发布机构] Stellenbosch University