Shears mechanism in [Formula Presented]

C. J. Chiara, S. J. Asztalos, B. Busse, R. M. Clark, M. Cromaz, M. A. Deleplanque, R. M. Diamond, P. Fallon, D. B. Fossan, D. G. Jenkins, S. Juutinen, N. S. Kelsall, R. Krücken*, G. J. Lane, I. Y. Lee, A. O. Macchiavelli, R. W. MacLeod, G. Schmid, J. M. Sears, J. F. SmithF. S. Stephens, K. Vetter, R. Wadsworth, S. Frauendorf

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Lifetimes of high-spin states in two [Formula Presented] bands and one [Formula Presented] band in [Formula Presented] have been measured using the Doppler shift attenuation method in an experiment performed using the [Formula Presented] reaction with the GAMMASPHERE array. Experimental total angular momenta and reduced transition strengths for both [Formula Presented] bands were compared with tilted axis cranking (shears mechanism) predictions and the [Formula Presented] band with principal axis cranking predictions, based on configurations involving two proton [Formula Presented] holes and one or three valence quasineutrons from the [Formula Presented] and mixed [Formula Presented] orbitals. Good overall agreement for angular momentum versus rotational frequency has been observed in each case. The [Formula Presented] band is shown to have a large [Formula Presented] ratio suggestive of antimagnetic rotation. Additionally, both dipole bands show a decreasing trend in [Formula Presented] strength as a function of spin, a feature of the shears mechanism. The experimental results are also compared with a semiclassical model that employs effective interactions between the proton holes and neutrons as an alternate interpretation for the shears mechanism.

Original languageEnglish
Number of pages1
JournalPhysical Review C - Nuclear Physics
Issue number3
Publication statusPublished - 1 Jan 2000

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