166Er levels populated in the166Tm decay

Lifetime measurements in166Er

“…The number of distances, N~, used for each transition are also shown in the table. The lifetimes of 166Er are identical to those presented in Table 1 Delayed coincidence, weighted average from several measurements [22] b [15] Recoil distance method [23] a Doppler broadened lineshape technique [16] ~ Recoil distance method [16] f Calculated from B(E2) [ [4,5,7] b Calculated from lifetimes given in [22] c E2/M 1-mixing 62 =484+_41969, [22] d 62 = 14+4, [22] ~ 62=400+_88~ ~ [22] f No 62 value was known for this transition and pure E2 was assumed From the measured lifetimes the B(E2) values can be calculated using known branching ratios and transition energies. The errors quoted are the quadratic sums of the statistical and the systematical errors.…”

“…For this calculation all states up to the 18 + state in the ground band and the 16 + state in the ?-band were included. The branching ratios were taken from previous works [4,5,7]. This is a reasonable assumption since the asymmetric rotor model is expected to describe these two bands rather well as shown in a recent publication on 168Er [23].…”

Precision test of the rotor model from band mixing inEr166

“…In contrast, the 2 γ , 3 γ , 4 γ , and 5 γ states are fed via 3 + states at 2132.9 and 2160.1 keV in 166 Er, which are strongly populated in the decay of 166 Tm. The decay of 166 Tm to 166 Er has been the subject of only a few experimental studies [15][16][17], and the uncertainty on the adopted [10] intensity for the 2 γ → 4 g transition is greater than 10%.…”