ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The half lives of the 5/2 5/2−[523] level at 25.7 keV in 66 161 Dy and the 5/2 5/2+[642] level in 68 163 Er, found in this work to lie at 69.2 keV, have been determined by the delayed coincidence method to be T1/2=27.8± 1.5 nsec, and T1/2=8.8± 0.5 nsec, respectively. The following hindrance factors relative to the single particle Weisskopf estimate (F W and the Nilsson estimate (FN were obtained: 66 161 Dy 5/2 5/2−[523] → 5/2 5/2+[642]:FW=(6.6± 1.3) × 103, FN=0.48± 0.10 68 163 Er 5/2 5/2+[642] → 5/2 5/2−[523]:FW=(2.4± 0.5)× 104, FN=1.8 ± 0.4 A systematic difference between transitions in odd proton nuclei and odd neutron nuclei was found: E1, ΔK=0 transitions in odd neutron nuclei have hindrance factors FN from 2.9 to 0.16, this means, these transitions are in agreement with the predictions of the Nilsson model within a factor of 10. For transitions in odd proton nuclei one has hindrance factors FN from 75 to 9.9 × 10−4. It is shown that a small difference between the deformation of the initial and the final state changes the transition probability of both, proton and neutron transitions, considerably.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01395014
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