(Stellenbosch : Stellenbosch University, 2016-03) Ndayishimye, Joram; Wyngaardt, Shaun M.; Lawrie, Elena A.; Stellenbosch University. Faculty of Science. Dept. of Physics
ENGLISH ABSTRACT : In order to extend knowledge about chirality in A ∼ 190 mass region, experiments were performed
at iThemba LABS for γ−spectroscopy studies in 192,193Tl. Previous level scheme of
193Tl was considerably modified and extended. Level scheme of 192Tl was also significantly
extended. Spins and parities were assigned to most of the levels. The yrast band in 192Tl
is associated with πh9/2⊗νi13/2 configuration which is suitable for chiral symmetry. A side
band with close excitation energies was observed, suggesting that the two bands in 192Tl
might form a chiral pair. More interestingly three bands in 193Tl have similar properties and
were associated with the same πh9/2 ⊗νi13/2
2. These bands might represent a multiplet of
chiral bands in 193Tl. Theoretical calculations using the Cranked Nilsson-Strutinsky (CNS)
model, the multi-particle rotor (MPR) model, and the two-quasiparticle-plus-triaxial rotor
model (TQPRM) support the presence of chiral symmetry in 192,193Tl.