Elsevier

Nuclear Physics A

Volume 291, Issue 2, 14 November 1977, Pages 510-526
Nuclear Physics A

Reorientation measurements on tungsten isotopes

https://doi.org/10.1016/0375-9474(77)90334-7Get rights and content

Abstract

In a particle-γ coincidence experiment, a thick tungsten target, of natural isotopic abundance, was bombarded with a and 16O beams. From analysis of the deexcitation γ-rays following Coulomb excitation, the spectroscopic quadrupole moment of the second 2+ state (the 2†' state) was determined for 186W and 184W. In a separate Coulomb excitation experiment a thin, isotopically enriched 186W target was bombarded with 16O ions. From analysis of projectiles scattered elastically and inelastically the quadrupole moment of the 2+' state of 186W was extracted. The results of the two experiments are in good agreement. The quadrupole moment of the 2+' state is found to be opposite in sign to that of the first 2+ state for both isotopes studied. However, its magnitude decreases rapidly in going from 186W to 186W, in contrast to the predictions of the rotation-vibration or asymmetric rotor models. The microscopic theory of Kumar and Baranger does predict the experimental trend, qualitatively. Thus the present results are interpreted as being evidence of strong coupling between β and γ degrees of freedom in the tungsten isotopes, which, according to the theory of Kumar and Baranger, is the source of the reduced value of the quadrupole moment.

References (27)

  • W. McLatchie et al.

    Nucl. Phys.

    (1970)
  • Th.W. Elze et al.

    Nucl. Phys.

    (1972)
  • R.M. Ronningen et al.

    Nucl. Phys.

    (1976)
  • K. Kumar et al.

    Nucl. Phys.

    (1968)
  • W.T. Milner et al.

    Nucl. Phys.

    (1971)
  • D.C. Camp et al.

    Nucl. Instr.

    (1969)
  • J.F. Ziegler et al.

    Atomic Data and Nucl. Data Tables

    (1974)
  • M.W. Guidry et al.

    Nucl. Phys.

    (1976)
  • F. Rosel et al.

    Comp. Phys. Commun.

    (1974)
  • K. Kumar

    Phys. Lett.

    (1969)
  • F.T. Baker et al.

    Nucl. Phys.

    (1976)
  • A. Faessler et al.

    Nucl. Phys.

    (1965)
  • J.R. Maxwell et al.

    Phys. Rev.

    (1966)
  • Cited by (13)

    • Nuclear Data Sheets for A=186

      2022, Nuclear Data Sheets
    • Nuclear Data Sheets for A = 184

      2010, Nuclear Data Sheets
    • Nuclear data sheets for A = 186

      2003, Nuclear Data Sheets
    • Electromagnetic properties of tungsten nuclei

      1991, Nuclear Physics, Section A
    • Sub-Nanosecond Lifetime Measurement Using the Recoil-Distance Method

      2000, Journal of Research of the National Institute of Standards and Technology
    View all citing articles on Scopus

    Research supported by the National Science Foundation.

    ††

    Present address: Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520.

    View full text