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Resolution of chiral conundrum in ¹⁰⁶Ag: Doppler-shift lifetime investigation

: Lieder, E.O.; Lieder, R.M.; Bark, R.A.; Chen, Q.B.; Zhang, S.Q.; Meng, J.; Lawrie, E.A.; Lawrie, J.J.; Bvumbi, S.P.; Kheswa, N.Y.; Ntshangase, S.S.; Madiba, T.E.; Masiteng, P.L.; Mullins, S.M.; Murray, S.; Papka, P.; Roux, D.G.; Shirinda, O.; Zhang, Z.H.; Zhao, P.W.; Li, Z.P.; Peng, J.; Qi, B.; Wang, S.Y.; Xiao, Z.G.; Xu, C.


Physical review letters 112 (2014), No.20, Art.202502, 6 pp.
ISSN: 0031-9007
ISSN: 1079-7114
Journal Article
Fraunhofer INT ()

The nature of the chiral candidate bands in ¹⁰⁶Ag, one of only two known examples of candidates which actually cross, is investigated experimentally and theoretically. Lifetimes have been determined for these bands in ¹⁰⁶Ag using the Doppler-shift attenuation method with the γ-detector array AFRODITE. The level scheme of ¹⁰⁶Ag has been extended, and three negative-parity bands have been observed to high spins. Configurations were assigned to the negative-parity bands based on a quasiparticle alignment analysis and on configuration-fixed constrained relativistic mean field calculations. The excitation energies, B(M1) and B(E2) values, as well as B(M1)/B(E2) ratios have been compared with results of particle-rotor model calculations. From the investigations, it is concluded that the three close-lying negative-parity bands are a two-quasiparticle high-K band and a pair of four-quasiparticle bands. The proposal that the two lowest-lying bands are chiral partners has not been confirmed.