Shears mechanism in Cd-109

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 Krucken, 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

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Lifetimes of high-spin states in two Delta I=1 bands and one Delta I=2 band in Cd-109 have been measured using the Doppler shift attenuation method in an experiment performed using the Zr-96(O-18,5n) reaction with the GAMMASPHERE array. Experimental total angular momenta and reduced transition strengths for both Delta I=1 bands were compared with tilted axis cranking (shears mechanism) predictions and the Delta I=2 band with principal axis cranking predictions, based on configurations involving two proton g(9/2) holes and one or three valence quasineutrons from the h(11/2) and mixed g(7/2)/d(5/2) orbitals. Good overall agreement for angular momentum versus rotational frequency has been observed in each case. The Delta I=2 band is shown to have a large J((2))/B(E2) ratio suggestive of antimagnetic rotation. Additionally, both dipole bands show a decreasing trend in B(M1) 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
Article number034318
Pages (from-to)-
Number of pages11
JournalPhysical Review C
Issue number3
Publication statusPublished - Mar 2000


  • PB-198

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