Frequency and Alignment Classification of Multiple Band Crossings

L. L. Riedinger; O. Andersen; S. Frauendorf; J. D. Garrett; J. J. Gaardhøje; G. B. Hagemann; B. Herskind; Y. V. Makovetzky; J. C. Waddington; M. Guttormsen; P. O. Tjøm

doi:10.1103/PhysRevLett.44.568

Frequency and Alignment Classification of Multiple Band Crossings

L. L. Riedinger, O. Andersen, S. Frauendorf, J. D. Garrett, J. J. Gaardhøje, G. B. Hagemann, B. Herskind, Y. V. Makovetzky, J. C. Waddington, M. Guttormsen, and P. O. Tjøm

Phys. Rev. Lett. 44, 568 – Published 3 March 1980

Abstract

Experiments on ${}^{160}{Yb}$ indicate three negative-parity bands up to $I >~ 21 ℏ$ . All three experience a band crossing around a frequency $ℏ ω = 0.36$ MeV, a value intermediate to those of the first and second yrast backbends. The $i_{\frac{13}{2}}$ band in ${}^{161}{Yb}$ is observed up to ${\frac{49}{2}}^{+}$ ; it also has a strong upbend at this intermediate frequency. The fingerprint of a band crossing based upon the crossing frequency and gain in aligned angular momentum is demonstrated and the results compared to cranking-model calculations to suggest quasiparticle assignments for the bands.

Received 13 August 1979

DOI:https://doi.org/10.1103/PhysRevLett.44.568

Authors & Affiliations

L. L. Riedinger^*, O. Andersen, S. Frauendorf^†, J. D. Garrett, J. J. Gaardhøje, G. B. Hagemann, B. Herskind, and Y. V. Makovetzky^‡

The Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark

J. C. Waddington

Institute of Physics, University of Bergen, Bergen, Norway, and McMaster University, Hamilton, Ontario L8S 4M1, Canada

M. Guttormsen and P. O. Tjøm

Institute of Physics, University of Oslo, Olso, Norway

^*Permanent address: Department of Physics, University of Tennessee, Knoxville, Tennessee 37916.
^†Permanent address: Central Institute for Nuclear Research, Rossendorf, Democratic Republic of Germany.
^‡Permanent address: Institute for Nuclear Research, Kiev, U.S.S.R.