Speaker
Level for award<br> (Hons, MSc, <br> PhD)?
None
Apply to be<br> considered for a student <br> award (Yes / No)?
No
Main supervisor (name and email)<br>and his / her institution
Dr. Obed Shirinda
obed@tlabs.ac.za
iThemba LABS
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
Three negative-parity rotational bands have been identified in the 194Tl [1-3] nucleus. All three bands are associated with a four-quasiparticle πh9/2 x νi13/2-3 configuration at high spins. Two of these bands show exceptionally close near-degeneracy in the excitation energies, and furthermore a close similarity in their other properties, e.g. alignments, B(M1)/B(E2) ratios, etc. [1]. Based on these results the pair of four-quasiparticle negative-parity bands in 194Tl was interpreted as perhaps the best chiral pair found to date [1]. The nature of the third πh9/2 x νi13/2-3 band, however, remains unclear. It was suggested [2], that this band could correspond to axially symmetric nuclear shape. As an alternative, the three bands could form a multiplet of chiral partners built on the same nucleon configuration [2]. In this work we aim at studying further the nature of the three negative-parity bands. We used the experimental data on the lifetime measurements for these bands [3] and performed multi-particle-plus-triaxial rotor model (MPR) [4] calculations. These calculations were carried out for both triaxial (β2 = 0.15, γ = 40°) and axially symmetric nuclear shape. The results will be presented and discussed.
[1] P.L. Masiteng et al., Phys. Lett. B719, 83 (2013).
[2] P.L. Masiteng et al., Submitted to Eur. Phys. J. A
[3] P.L. Masiteng, PhD thesis, University of the Western Cape, (2013).
[4] B.G. Carlsson and I. Ragnarsson, Phys. Rev. C74, 044310 (2006).
