Linear polarization and directional distribution of gamma-rays from oriented172Lu

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 keV Kπ = (4+) {p 4041 ↓ + p 411 ↓} + {n 514↓ - n 521↓} 1663 keV Kπ = (3+) {n 514↓ - n 521↓} + {n 512↑ - n 521↓} 1172 keV Kπ = 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 the Kπ = 4- band. © 1983 Academia, Publishing House of the Czechoslovak Academy of Sciences

Nuclear orientation of152,154Tb in gadolinium

The anisotropy in the directional distribution of gamma-rays from the decay of152,154Tb oriented in a gadolinium matrix at low temperatures, has been measured at the angles of 0 and π/2 with respect to the applied magnetic field direction at temperature of (15±1) mK. Unambiguous values of spin have been deduced for several levels in152Gd. Multipole mixing ratios of many gamma-ray transitions occurring in152Gd have been found and results are compared with the similar transitions in150,154,156Gd and they are discussed in terms of the rotational-vibrational model and dynamic deformation theory based on the Strutinsky method. Our results confirm the spin value of 0 for 21·4 h isomer in154Tb and they establish the spin value of 3 for the 2277·0 and 2336·1 keV levels and the spin value of 4 for the 2416·3 keV level in154Gd. © 1981 Academia, Publishing House of the Czechoslovak Academy of Sciences