Evidence for a New Type of Shears Mechanism in $^{106}\mathrm{C}\mathrm{d}$

Evidence for a New Type of Shears Mechanism in ${}^{106}{C d}$

A. J. Simons, R. Wadsworth, D. G. Jenkins, R. M. Clark, M. Cromaz, M. A. Deleplanque, R. M. Diamond, P. Fallon, G. J. Lane, I. Y. Lee, A. O. Macchiavelli, F. S. Stephens, C. E. Svensson, K. Vetter, D. Ward, and S. Frauendorf

Phys. Rev. Lett. 91, 162501 – Published 14 October 2003

Abstract

Lifetimes of states in the lowest lying positive parity band in ${}^{106}{C d}$ have been measured using the Doppler shift attenuation method. The deduced $B (E 2)$ transition rates show a marked decrease with increasing spin. Cranking and semiclassical model calculations suggest that the structure has the character of a shears-type band resulting from the coupling of $g_{9 / 2}$ proton holes to aligned pairs of $h_{11 / 2}$ and $g_{7 / 2}$ neutron particles. This is the first clear evidence for the phenomenon of “antimagnetic” rotation in nuclei.

Received 26 June 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.162501

Authors & Affiliations

A. J. Simons, R. Wadsworth, and D. G. Jenkins

Department of Physics, University of York, Heslington, York Y010 5DD, United Kingdom

R. M. Clark, M. Cromaz, M. A. Deleplanque, R. M. Diamond, P. Fallon, G. J. Lane^*, I. Y. Lee, A. O. Macchiavelli, F. S. Stephens, C. E. Svensson^†, K. Vetter^‡, and D. Ward

Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

S. Frauendorf

Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA, and FZ Rossendorf, Postfach 510119, D-01314, Dresden, Germany

^*Present address: Department of Nuclear Physics, Australian National University, Canberra, ACT 2000, Australia.
^†Present address: Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
^‡Present address: Glenn T. Seaborg Institute, Lawrence Livermore National Laboratory, Livermore,CA 94550, USA.

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Vol. 91, Iss. 16 — 17 October 2003

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Physical Review Letters

Evidence for a New Type of Shears Mechanism in Cd106

A. J. Simons, R. Wadsworth, D. G. Jenkins, R. M. Clark, M. Cromaz, M. A. Deleplanque, R. M. Diamond, P. Fallon, G. J. Lane, I. Y. Lee, A. O. Macchiavelli, F. S. Stephens, C. E. Svensson, K. Vetter, D. Ward, and S. Frauendorf

Phys. Rev. Lett. 91, 162501 – Published 14 October 2003

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Evidence for a New Type of Shears Mechanism in ${}^{106}{C d}$