Large B(M1) staggering at high spins in Zr86: Broken boson pairs in the four-quasiparticle regime

P. Chowdhury, C. J. Lister, D. Vretenar, Ch. Winter, V. P. Janzen, H. R. Andrews, D. J. Blumenthal, B. Crowell, T. Drake, P. J. Ennis, A. Galindo-Uribarri, D. Horn, J. K. Johansson, A. Omar, S. Pilotte, D. Prévost, D. Radford, J. C. Waddington, and D. Ward
Phys. Rev. Lett. 67, 2950 – Published 18 November 1991
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Abstract

The transitional nucleus Zr86 has been studied by the Ni60(30Si,2p2n) reaction, with γ-γ coincidence, angular correlation, Doppler-shift-attenuation and measurements. Band structures exhibiting strongly staggered M1 transition rates were found at high spins, with large B(M1) values but no significant E2 collectivity. The unusual behavior of this nucleus is interpreted within the framework of an interacting boson model incorporating two broken boson pairs. This new model for high-spin states is seen to be remarkably successful in describing the electromagnetic decay properties in the four-quasiparticle regime.

  • Received 12 August 1991

DOI:https://doi.org/10.1103/PhysRevLett.67.2950

©1991 American Physical Society

Authors & Affiliations

P. Chowdhury, C. J. Lister, D. Vretenar, Ch. Winter, V. P. Janzen, H. R. Andrews, D. J. Blumenthal, B. Crowell, T. Drake, P. J. Ennis, A. Galindo-Uribarri, D. Horn, J. K. Johansson, A. Omar, S. Pilotte, D. Prévost, D. Radford, J. C. Waddington, and D. Ward

  • A.W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511
  • Atomic Energy of Canada Limited Research, Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0
  • Tandem Accelerator Laboratory, McMaster University, Hamilton, Ontario, Canada L8S 4K1
  • University of Toronto, Toronto, Ontario, Canada M5S 1A7
  • Laboratoire de Physique Nucléaire, Université de Montréal, Montréal, Québec, Canada H3C 3J7

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Vol. 67, Iss. 21 — 18 November 1991

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