LIFETIME DETERMINATION OF THE 2+ AND 4+ ROTATIONAL LEVELS IN Gd$sup 154$ AND THE EFFECT OF ROTATION-VIBRATION INTERACTION
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
The lifetimes of the 2/sup +/ and 4/sup +/ rotational levels of Gd/sup 154/ were determined by coincidence measurements between the beta spectrum of Eu/ sup 154/ and the conversion lines deexciting the levels under investigation, utilizing a doublelens coincidence spectrometer. The measurements were carried out using the self-comparison method and a timeto-amplitude converter. The mean lifetimes of the 371and the 123-kev levels were found to be (5.6 plus or minus 0.7) x 10/sup -11/ sec and (1.67 plus or minus 0.07) x 10/sup -9/ sec, respectively. The measured ratio for the reduced transition probabilities, B(E2; 4/sup +/ yields 2/sup +/)/B(E2; 2/sup +/ yields 0/sup +/) = 1.77 plus or minus 0.25, deviates fr om the value 1.43 predicted by the strict rotational model. The effect of rotation-vibration interaction on the transition probability ratios within a rotational band is discussed. These ratios are related uniquely to the distortion of the energy spacings. In the case of the ground-state band of Gd/sup 154/, theory thus predicts B(E2; 4/sup +/ yields 2/ sup +/)/B(E2; 2/sup +/ Y 0/sup +/) = 1.62 in agreement with experiment. (auth)
- Research Organization:
- Hebrew Univ., Jerusalem
- NSA Number:
- NSA-17-013575
- OSTI ID:
- 4760206
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 129; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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