Near-degenerate rotational bands in the Tl isotopes

Lawrie, E. A. ; Ndayishimye, J. ; Masiteng, P. L. ; Shirinda, O. (2018)

CITATION: Lawrie, E. A., et al. 2018. Near-degenerate rotational rands in the Tl isotopes. Acta Physica Polonica B Proceedings Supplement, 11(1):81-87, doi:10.5506/APhysPolBSupp.11.81.

The original publication is available at https://www.actaphys.uj.edu.pl

Article

Sets of near-degenerate rotational bands built on configurations involving nh9/2 particle and vi13/2 holes were observed in the neighbouring 193;194Tl isotopes. Such sets of bands, involving particle and hole configurations and occurring in nuclei with triaxial shape, are caused by chiral symmetry formed in angular momentum space. Each nuclear chiral system is expected to generate a pair of near-degenerate partner bands. However, several sets of three partner bands were observed in these Tl isotopes, raising questions whether one or two chiral systems are formed, and which two bands are partners in the chiral pair. Many-particle-rotor model calculations reproduce well the features of the observed negative-parity bands in 193;194Tl and support the suggested chiral geometry of the angular momenta.

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