Elsevier

Nuclear Physics A

Volume 240, Issue 1, 10 March 1975, Pages 137-170
Nuclear Physics A

The level scheme of 137Pr; evidence for prolate nuclear shape

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Abstract

The level scheme of 137Pr was investigated by means of the γ-rays following the β-decay of 137Nd as well as by prompt γ-rays accompanying (α, xn) reactions. We measured γ-ray single spectra, γγ coincidences (both in-beam and off-beam), angular distributions of prompt γ-rays and conversion electrons. About 100 γ-rays were assigned to the 38 min decay of 137Nd most of which fit into a scheme of 26 deduced levels. From in-beam experiments we tentatively assigned an 112 level which is the basis of a strong cascade of stretched E2 transitions with a probable level sequence of 232192152112. The interpretation of this cascade in the framework of a strong coupling model indicates a prolate deformation of 137Pr. Another indication for such a deformation was obtained from the very low energy (75 keV) of the first 32+ level which could not be interpreted in an intermediate coupling model, but is suggested by a Nilsson scheme.

References (34)

  • K. Nakai et al.

    Phys. Lett.

    (1973)
    F.S. Stephens et al.

    LBL report no. 652

    (1972)
  • D. Habs et al.
  • P.F. Zweifel

    Phys. Rev.

    (1957)
  • J.R. Grover

    Phys. Rev.

    (1967)
  • C. Droste et al.

    Nucl. Phys.

    (1970)
  • J.R. Leigh et al.

    Nucl. Phys.

    (1973)
  • D.C. Choudhury

    Mat. Fys. Medd. Dan. Vid. Selsk.

    (1954)
  • T. Yamazaki

    Nucl. Data

    (1967)
  • K. Nakai

    Phys. Lett.

    (1971)
  • D. Habs
  • D. Habs et al.

    Z. Phys.

    (1974)
    D. Habs et al.

    KFK report no. 1715

    (1973)
  • G. Gneuss et al.

    Nucl. Phys.

    (1971)
  • J. van Klinken et al.

    KFK report no. 1768

    (1973)
  • K. Gromov et al.

    Nucl. Phys.

    (1965)
  • B.H. Ketelle et al.

    Bull. Am. Phys. Soc.

    (1967)
    B.H. Ketelle et al.

    ORNL 4164

    (1969)
  • H. Klewe-Nebenius
  • V.S. Buttsev et al.

    JINR-P6-6804 Dubna

    (1972)
    V.S. Buttsev et al.

    Izv. Akad. Nauk USSR (ser. fiz.)

    (1973)
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