Using Doppler shift techniques, lifetimes of high spin states have been measured in a number of nuclei near N-90 in order to get their dynamic electric quadrupole moments, which are a direct reflection of the collective aspects of the nuclear wave functions. The potential energy surfaces of /sup 160/Yb (N = 90) reveal that it is very shallow in the ..gamma.. degree of freedom as well as in epsilon/sub 2/ and thus should be susceptible to deformation driving influences. Quadrupole transition moments extracted from lifetime data show that especially in /sup 160,161/Yb this is true. Lifetime measurements were carried out …
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Using Doppler shift techniques, lifetimes of high spin states have been measured in a number of nuclei near N-90 in order to get their dynamic electric quadrupole moments, which are a direct reflection of the collective aspects of the nuclear wave functions. The potential energy surfaces of /sup 160/Yb (N = 90) reveal that it is very shallow in the ..gamma.. degree of freedom as well as in epsilon/sub 2/ and thus should be susceptible to deformation driving influences. Quadrupole transition moments extracted from lifetime data show that especially in /sup 160,161/Yb this is true. Lifetime measurements were carried out on /sup 158/Er in the ..gamma..-..gamma.. coincidence mode. The /sup 158/Er data were analyzed in four ways. Shifted and unshifted peak intensities were first extracted from the total-projected coincidence spectra. Similarly, they were extracted from spectra generated by the sum of all gates below the state of interest, by the gate on the first transition above and by the gate on the second transition above the one of interest. There is evidence for centrifugal stretching in the ground band and a dropoff of collectivity in the s band. 4 figs.
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Johnson, N.R.Information on nuclear shapes at high spins from lifetime measurements,
article,
January 1, 1985;
Tennessee.
(https://digital.library.unt.edu/ark:/67531/metadc1060998/:
accessed April 24, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.