Systematics of even-even Tz= 1 nuclei in the A= 80 region: High-spin rotational bands in 74Kr, 78Sr, and 82Zr

D. Rudolph, C. Baktash, C. J. Gross, W. Satula, R. Wyss, I. Birriel, M. Devlin, H.-Q. Jin, D. R. LaFosse, F. Lerma, J. X. Saladin, D. G. Sarantites, G. N. Sylvan, S. L. Tabor, D. F. Winchell, V. Q. Wood, and C. H. Yu
Phys. Rev. C 56, 98 – Published 1 July 1997
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Abstract

High-spin states of Tz=1 nuclei were studied with the reactions 58Ni(28Si,3α)74Kr, 58Ni(28Si,2α)78Sr, and 58Ni(28Si,2p2n)82Zr at 130 MeV beam energy. The Gammasphere array in conjunction with the 4π charged-particle detector array Microball was used to detect γ rays in coincidence with evaporated light charged particles. The known π=+, α=0 yrast bands were extended to I=28ħ at 20 MeV excitation energy. For all three nuclei, a number of positive- and negative-parity sidebands were established; altogether 15 new rotational bands were found. The data are discussed using the pairing-and-deformation self-consistent total Routhian surface (TRS) model: High-spin structures of 74Kr and 78Sr are governed by the shell gaps at large prolate deformation while 82Zr seems to exhibit shape coexistence. Nearly identical bands were established which may be explained as arising from the fp orbits acting as spectators at very elongated shapes. The experimental data in these Tz=1 nuclei are in good agreement with predictions of the TRS model using conventional T=1 like-nucleon pairing correlations.

  • Received 19 February 1997

DOI:https://doi.org/10.1103/PhysRevC.56.98

©1997 American Physical Society

Authors & Affiliations

D. Rudolph1,2, C. Baktash1, C. J. Gross1,3, W. Satula4,5,6, R. Wyss7, I. Birriel8, M. Devlin9, H.-Q. Jin1, D. R. LaFosse9, F. Lerma9, J. X. Saladin8, D. G. Sarantites9, G. N. Sylvan10, S. L. Tabor10, D. F. Winchell8, V. Q. Wood8, and C. H. Yu1

  • 1Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
  • 2Sektion Physik der Ludwig-Maximilians-Universität München, D-85748 Garching, Germany
  • 3Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831
  • 4Department of Physics, University of Tennessee, Knoxville, Tennessee 37996
  • 5Joint Institute for Heavy Ion Research, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
  • 6Institute of Theoretical Physics, Warsaw University, PL-00681 Warsaw, Poland
  • 7The Royal Institute of Technology, Physics Department Frescati, S-104 05 Stockholm, Sweden
  • 8Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
  • 9Chemistry Department, Washington University, St. Louis, Missouri 63130
  • 10Department of Physics, Florida State University, Tallahassee, Florida 32306

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Vol. 56, Iss. 1 — July 1997

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