Spectroscopy of Tl; Shape coexistence

Guo, C. Y.*; Andreyev, A. N.; 38 of others*

The prompt and delayed -ray spectra of Tl was studied via the Nd(Cr, )Tl fusion-evaporation reaction. The collective bands with one-quasiparticle configurations from the 2, 1, 1, and 1 orbitals and high-lying structures with possible three-quasiparticle configurations are investigated in terms of the tilted axis cranking covariant density functional theory. At low excitation energy, the rotational bands with one-quasiparticle configurations reflect coexistence of three shapes: prolate, triaxial, and oblate. The possible shapes of two microsecond isomers at high excitation energy are proposed.