High-K quasiparticle structures in 
Er and 
Er
J. Simpson1 - M.A. Riley2 - R.W. Laird2 - D.J. Hartley2 - F.G. Kondev2 - J. Sweeney3 - A.N. Wilson4 - S.J. Gale4 - M.A. Bentley5 - A.M. Bruce6 - R. Chapman7 - R.M. Clark8 - D.M. Cullen9 - P. Fallon10 - P.D. Forsyth4 - S.J. Freeman11 - P.M. Jones4 - J.C. Lisle3 - A.O. Macchiavelli10 - J.F. Sharpey-Schafer4 - A.G. Smith3 - J.F. Smith4 - D.M. Thompson3
1 CCLRC, Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UK
2 Department of Physics, Florida State University, Tallahassee, FL 32306, USA
3 Schuster Laboratory, University of Manchester, Manchester, M13 9PL, UK
4 Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK
5 School of Sciences, Staffordshire University, Stoke on Trent, ST4 2DE, UK
6 Department of Mechanical and Manufacturing Engineering, University of Brighton,
Brighton, BN2 4GJ, UK
7 Department of Physics, University of Paisley, Paisley, PA1 2BE, UK
8 Department of Physics, University of York, Heslington, York, YO1 5DD, UK
9 Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831,
USA
10 Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley CA
94720, USA
11 Niels Bohr Institute, Tandem Accelerator Laboratory, DK-4000 Roskilde, Denmark
Received: 19 November 1997 Communicated by B. Herskind
Abstract
A series of new strongly coupled high-K, multi-quasiparticle
structures have been observed in the light erbium transitional nuclei,
159Er and 160Er. The interpretation of these bands is discussed
within the framework of the cranked shell model. These sequences, when taken
together with the existing quasiparticle excitations, form a near complete set
of low-lying, multi-quasiparticle structures on which a coherent series of
aligned angular momentum, band crossing and blocking arguments can be based.
The measured B(M1)/B(E2) ratios are compared with geometrical calculations to
test the proposed configuration assignments.
PACS
23.20.Lv Gamma transitions and level energies -
27.70.+q 
Copyright Springer-Verlag
