Residual interactions and tilted rotation in odd-odd 164Tm

W. Reviol, L. L. Riedinger, X. Z. Wang, J.-Y. Zhang, H. J. Jensen, G. B. Hagemann, R. A. Bark, P. O. Tjøm, S. Leoni, T. Lönnroth, H. Schnack-Petersen, T. Shizuma, J. Wrzesinski, and P. B. Semmes
Phys. Rev. C 59, 1351 – Published 1 March 1999
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Abstract

High-spin spectroscopy on odd-odd 164Tm has produced new illustrations of departures from the predictions of principal-axis cranking. Among the nine strongly coupled rotational bands observed, four are assigned to the parallel and antiparallel couplings of two configurations πh11/2νi13/2 and πg9/2νi13/2. This represents the first time that the high-spin properties of both couplings can be explored. We find that the measured B(M1)/B(E2) values in the K=1() coupling of πh11/2νi13/2 are 50% larger than those in the K=6 (↑↑) coupling, and represent the largest seen in this nucleus. Tilted-axis cranking calculations successfully explain the M1/E2 ratios in these two bands, while the particle-rotor calculations did not reproduce the full low-K enhancement. No inversion in the signatures of the K=6πh11/2νi13/2 band is observed, but there is a small inversion in the K=1 coupling up to I=17ħ and a large inversion in the πh9/2νi13/2 band up to I=19ħ. Remarkably, particle-rotor calculations with a pn interaction included are able to reproduce these inversions. A stronger pn interaction is needed to explain an inversion in the πd3/2νi13/2 band.

  • Received 17 September 1998

DOI:https://doi.org/10.1103/PhysRevC.59.1351

©1999 American Physical Society

Authors & Affiliations

W. Reviol, L. L. Riedinger, X. Z. Wang, and J.-Y. Zhang

  • Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200

H. J. Jensen, G. B. Hagemann, R. A. Bark*, P. O. Tjøm, S. Leoni, T. Lönnroth§, H. Schnack-Petersen, T. Shizuma, and J. Wrzesinski

  • Niels Bohr Institute, University of Copenhagen, Tandem Accelerator Laboratory, Roskilde, Denmark

P. B. Semmes

  • Tennessee Technological University, Cookeville, Tennessee 38505

  • *Present address: Department of Nuclear Physics, Australian National University, Canberra, ACT 0200, Australia.
  • Permanent address: Department of Physics, University of Oslo, Oslo, Norway.
  • Present address: Dipartemento di Fisica, Universita di Milano, 20133 Milano, Italy.
  • §Permanent address: Department of Physics, Abo Akademi, Finland.
  • Present address: Department of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki 305-8577, Japan.
  • Permanent address: Niewodniczanski Institute of Nuclear Physics, PL-31-342 Cracow, Poland.

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Vol. 59, Iss. 3 — March 1999

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