Magnetic properties of 166Er and the collective model

Gyromagnetic ratios of collective states of166Er

“…The observed E2/M1 mixing parameters for several interband transitions between the 7-vibrational band and the ground state band fit well into theoretical predictions and systematic trends [36,40,41]. A special feature is noticed: The K-forbidden M1 amplitude for the 831 keV transition between the 7 + state of the 7 vibrational band and the 6+ state of the ground state rotational band is significantly larger than the M1 amplitude for interband transitions to the 4 + and 8g + states, which indicates a lower purity of the 6 + rotational state.…”

Directional correlations in the decay of 1200y 166Ho

“…Their explicit form is also given in Table 4. One feature of these corrections is an alternating dependence for I-~l+_l transitions and this very behaviour is also seen in the theoretical data of [1] displayed in Fig. 4.…”

“…Fig. 4 as A-1 where, for comparison, we also include theoretical A which are calculated in the same way as above from the theoretical mixing ratios 3th taken from our letter [1]. In contrast to the nuclei at the beginning and end of the deformed region [15] the variations of the experimental data tbr 166Er are not as pronounced.…”

“…In 166Er one can measure the E2/M1 multipole mixing ratios, 6, for the whole series of 7 to ground band transitions up to spin 8 to test this effect in a well deformed nucleus. In our letter [1], a new collective model approach to the understanding of small M1 admixtures in % ev% ' "~,'~" "r r r176 ~~ -~c3'~b" r Fig. 1.…”

“…In an earlier letter [1], we described briefly our careful measurement of the E2/M1 admixtures in transitions from the gamma vibrational band to the ground state band in a66Er. These investigations were carried out systematically to high angular momentum states to test the collective model.…”