Elsevier

Nuclear Physics A

Volume 239, Issue 2, 24 February 1975, Pages 333-352
Nuclear Physics A

Coulomb excitation of 67Zn and core-quasiparticle coupling in f52 nuclei

https://doi.org/10.1016/0375-9474(75)90455-8Get rights and content

Abstract

A qualitative explanation of the low-lying levels of g92 shell nuclei using a recent theoretical improvement upon quasiparticle-phonon coupling theories has motivated the investigation of 67Zn, which belongs in the f52 neutron shell. A Coulomb excitation experiment was performed with 3.2 to 4.86 MeV α-particles. De-excitation γ-rays were observed with a 45 cm3 Ge(Li) detector. In addition to excitation of previously known states at 184.6 keV (32) and 880.0 keV (52), strong excitation of states at 815.2 keV (52, 72) and 870.9 keV (32, 52, 72) was observed. The latter state also appears to have been observed in high resolution (d, p) stripping work. Angular distribution data were taken at Eα = 4.0 and 4.86 MeV, and were used to obtain branching ratios, reduced upward transition probabilities, mixing ratios and spin assignments. The B(E2)↑ associated with the 67Zn levels populated in this experiment are (in units of e2 · b2) 184.6 keV (0.0190 ± 0.0014), 393.6 keV (0.00049 ± 0.00003), 815.2 keV (0.029 ± 0.002), 870.9 keV (0.04 ± 0.02), and 888.0 keV (0.0086 ± 0.0006). An extensive diagonalization using three single-quasiparticle states (f52, p32, and P12) in 67Zn, each coupled to a core phonon, was carried out and detailed predictions were made for level energies, reduced transition probabilities, magnetic dipole and electric quadrupole moments, relative γ-ray intensities, and mixing ratios. Generally, the predictions are in good agreement with 67Zn experimental data. Data for other f52 shell nuclei lend further qualitative support to a quasiparticle-phonon coupling picture for odd-A nuclei in the f52 shell. It is suggested that an extra 32 low-lying level present in several f52 shell nuclei has characteristics similar to those of the three-quasiparticle “intruder” state described by Kisslinger.

References (30)

  • G. Salzman et al.

    Nucl. Phys.

    (1972)
  • V.K. Thankappan et al.

    Phys. Rev.

    (1965)
  • R. Knerr et al.

    Z. Phys.

    (1971)
  • A. Goswami et al.

    Nucl. Phys.

    (1970)
  • G.J. Perlow et al.

    Phys. Rev.

    (1973)
  • L.S. Kisslinger et al.

    Rev. Mod. Phys.

    (1963)
  • A. Goswami et al.

    Phys. Rev.

    (1967)
    A.I. Sherwood et al.

    Nucl. Phys.

    (1966)
  • A. Goswami et al.

    Phys. Rev.

    (1973)
  • G.M. Temmer et al.

    Phys. Rev.

    (1956)
  • R.C. Ritter et al.

    Phys. Rev.

    (1962)
  • M.S. Freedman et al.

    Phys. Rev.

    (1966)
  • Chr. Bargholtz et al.

    Z. Phys.

    (1973)
  • Nucl. Data

    (1968)
  • A. Kuriyana et al.

    Prog. Theor. Phys.

    (1972)
  • E.F. Gibson et al.

    Phys. Rev.

    (1968)
    K.W. Dolan et al.

    Phys. Rev.

    (1968)
  • Cited by (44)

    • Nuclear Data Sheets for A=64

      2021, Nuclear Data Sheets
    • Nuclear Data Sheets for A = 66

      2010, Nuclear Data Sheets
    • Nuclear Data Sheets for A = 64

      2007, Nuclear Data Sheets
    • Nuclear data sheets for A = 67

      2005, Nuclear Data Sheets
    • Nuclear data sheets for A = 73

      2004, Nuclear Data Sheets
    View all citing articles on Scopus

    Work supported in part by a grant from the National Science Foundation.

    View full text