$^{194}$Tl as the first example revealing chiral symmetry breaking in a pair of four-quasiparticle bands

A study of 194 Tl has revealed the presence of two strongly coupled negative-parity rotational bands up to the 24 − and 23 − states, respectively. These two bands are associated with the two-quasiparticle configuration at lower spins and the four-quasiparticle configuration at higher spins. The two 4-quasiparticle bands show exceptionally close near-degeneracy in the excitation energies. The relative excitation energies of these 4-quasiparticle bands were compared to the relative excitation energies of the best known chiral candidates with close near-degeneracy. This is one of the best cases of near degeneracy in partner bands observed to date, probably resulting from a chiral geometry in the angular momentum space. It is also the first pair of 4-quasiparticle bands associated with chiral symmetry