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Possible chirality in the doubly-odd Tl-198 nucleus: Residual interaction at play

Abstract : A candidate for chiral bands was found in (198)Tl for the first time in a mass region of oblate (or nonaxial with gamma >= 30 degrees) deformed nuclei. Two bands show very similar quasiparticle alignments, moments of inertia, and B(M1)/B(E2) ratios. They have a relative excitation energy of about 500 keV and different patterns of energy staggering. Calculations using the two-quasiparticle-plus-triaxial-rotor model with residual proton-neutron interaction included show that a triaxial deformation with gamma similar to 44 degrees agrees very well with all the experimental observations. Furthennore, considerable energy staggering for both partner bands was calculated for this pi h(9/2) circle times vi(13/2)(-1) configuration at gamma - 30 degrees, suggesting that chiral bands may have substantial energy staggering.
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http://hal.in2p3.fr/in2p3-00854938
Contributor : Christine Hadrossek <>
Submitted on : Wednesday, August 28, 2013 - 1:42:18 PM
Last modification on : Wednesday, October 14, 2020 - 3:59:54 AM

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E.A. Lawrie, P.A. Vymers, J.J. Lawrie, Ch. Vieu, R.A. Bark, et al.. Possible chirality in the doubly-odd Tl-198 nucleus: Residual interaction at play. Physical Review C, American Physical Society, 2008, 78, pp.021305. ⟨10.1103/PhysRevC.78.021305⟩. ⟨in2p3-00854938⟩

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