Shears mechanism in {sup 109}Cd

Journal Article · Wed Mar 01 04:00:00 EST 2000 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.61.034318· OSTI ID:20215669

Chiara, C J ^[1]; Asztalos, S J ^[2]; Busse, B ^[2]; Clark, R M ^[2]; Cromaz, M ^[2]; Deleplanque, M A ^[2]; Diamond, R M ^[2]; Fallon, P ^[2]; Fossan, D B ^[1]; Jenkins, D G ^[3]

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1. Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800 (United States)
2. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
3. Department of Physics, University of York, Heslington, York, YO1 5DD, (United Kingdom)

Lifetimes of high-spin states in two {delta}I=1 bands and one {delta}I=2 band in {sup 109}Cd have been measured using the Doppler shift attenuation method in an experiment performed using the {sup 96}Zr({sup 18}O,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{sub 9/2} holes and one or three valence quasineutrons from the h{sub 11/2} and mixed g{sub 7/2}/d{sub 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{sup (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. (c) 2000 The American Physical Society.

• OSTI ID: 20215669
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 61; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
CADMIUM 109
EXPERIMENTAL DATA
HIGH SPIN STATES
LIFETIME
OXYGEN 18 REACTIONS
ZIRCONIUM 96 TARGET