[en] High spin states in 194Tl, excited through the 181Ta(18O,5n) fusion evaporation reaction, were studied using the AFRODITE array at iThemba LABS. Candidate chiral bands built on the πh9/2 x νi13/21 configuration were found. Furthermore these bands were observed through a band crossing caused by the excitation of a νi13/2 pair. Above the band crossing the excitation energies remain close, suggesting that chirality may persist for the four quasiparticle configuration too.
Journal
[en] The high-spin states in 194Tl were studied using the 181Ta(18O, 5n) reaction and the AFRODITE γ -ray spectrometer at iThemba LABS. The level scheme of 194Tl was considerably extended with several new bands. Three negative-parity 4-quasiparticle bands were observed and associated with πh9/2 x νi13/2-3 configurations. Two of these form a candidate chiral pair with excellent near-degeneracy. In addition two new positive-parity bands were found. (orig.)
Journal
European Physical Journal. A; ISSN 1434-6001; 
; v. 50(7); p. 1-16
; v. 50(7); p. 1-16
[en] A pair of rotational bands associated with the πh9/2⊗νi13/2−1 configuration at lower spins and with the πh9/2⊗νi13/2−3 configuration at higher spins is found in 194Tl. The two 4-quasiparticle bands show exceptionally close near-degeneracy in the excitation energies. Furthermore close similarity is also found in their alignments and B(M1)/B(E2) reduced transition probability ratios. Such close near-degeneracy probably indicates chiral geometry in the angular momentum space
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