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In-beam spectroscopy of thek π=0− bands in230–236U

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Zeitschrift für Physik A Atomic Nuclei

Abstract

TheK π=0− bands in even uranium nuclei were studied in the compound reactions231Pa(p, 2n)230U,230, 232Th(α,2n)232, 234U and236U(d, pn)236U. In-beamγ-rays were measured in coincidence with conversion-electrons, which were detected with an iron-free orange spectrometer. The negative-parity levels are observed up to intermediate spins (I<13−). In addition, the 1− and 3− levels in230U were confirmed by a decay study with an isotope separated230Pa source. For the heavier isotopes (A≥232) the properties of theK π=0− bands (energies andγ-branchings) are consistent with a vibrational character of these bands. For230U theK π=0− band lies at rather low energy (E(1−)=367 keV), and the level spacings within this band are very similar to those of the isotones228Th and226Ra, which might indicate the onset of a stable octupole deformation.

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Authors and Affiliations

  1. Institut für Strahlen- und Kernphysik der Universität Bonn, Federal Republic of Germany

    P. Zeyen, B. Ackermann, U. Dämmrich, K. Euler, V. Grafen, C. Günther, P. Herzog, M. Marten-Tölle, B. Prillwitz & R. Tölle

  2. Sektion Physik der Universität München, Federal Republic of Germany

    Ch. Lauterbach & H. J. Maier

Authors
  1. P. Zeyen
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  2. B. Ackermann
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  3. U. Dämmrich
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  4. K. Euler
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  5. V. Grafen
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  6. C. Günther
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  7. P. Herzog
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  8. M. Marten-Tölle
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  9. B. Prillwitz
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  10. R. Tölle
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  11. Ch. Lauterbach
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  12. H. J. Maier
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Additional information

We thank the Kernforschungszentrum Karlsruhe for the Cyclotron irradiations and the crew of the Bonn mass separator at our Institute for the preparation of the230Pa sources. The236U target was placed at our disposal by Dr. P. David. This work was financially supported by the Bundesminister für Forschung und Technologie (grants Nr. 06 BN 451 and 06 ML 177II) and the Minister für Wissenschaft und Forschung des Landes Nordrhein-Westfalen.

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Zeyen, P., Ackermann, B., Dämmrich, U. et al. In-beam spectroscopy of thek π=0− bands in230–236U. Z. Physik A - Atomic Nuclei 328, 399–407 (1987). https://doi.org/10.1007/BF01289625

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  • DOI: https://doi.org/10.1007/BF01289625

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