Abstract

The gamma-ray linear polarization data in combination with the results of the directional distribution measurements were used to determine precise values of the multipole mixing ratios of the gamma-transitions in the172Yb nucleus. A detailed analysis of the deduced mixing ratios, supplemented by previous data, lends support to the following description of the two-quasiparticle excitations of192Yb (see also tab. 6): 2073 keVKπ = (4+) {p 4041 ↓ + p 411 ↓} + {n 514↓ − n 521↓} 1663 keVKπ = (3+) {n 514↓ − n 521↓} + {n 512↑ − n 521↓} 1172 keVKπ = 3+ {n 512↑ + n 521↓} + {p404↓ − P 411↓} A supporting evidence has also been given to the spin-parity assignments of the 1640 keV (Iπ = 4−) and 1706 keV (Iπ = 5−) members of theKπ = 4− band.

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