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High spin shell model excitations in149Gd

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

The high spin level structure of the three-neutron nucleus149Gd has been investigated by in-beamγ-ray and electron spectroscopy with (α, xn) reactions. The observed levels are characterized as members of the shell model multipletsνf 2/37 ,νh 9/2 f 2/27 ,νf 2/37 ×3−,νh 9/2 f 2/27 ×3−, and tentativelyνf 2/37 ×(3−)2. The energies of theν f 2/37 states agree only moderately with those calculated using empirical two-nucleon interactions taken from148Gd, which indicates the importance of long range contributions already atN=85.

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Authors and Affiliations

  1. Institut für Kernphysik, Kernforschungsanlage Jülich, Federal Republic of Germany

    M. Piiparinen, R. Pengo, Y. Nagai, E. Hammarén (Visitor) & P. Kleinheinz

  2. Department of Physics, University of Lund, Sweden

    N. Roy, L. Carlén & H. Ryde

  3. Research Institute of Physics, Stockholm, Sweden

    Th. Lindblad, A. Johnson, S. A. Hjorth & J. Blomqvist

  4. University of Jyväskylä, Finland

    E. Hammarén (Visitor)

Authors
  1. M. Piiparinen
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  2. R. Pengo
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  4. E. Hammarén
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  5. P. Kleinheinz
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  7. L. Carlén
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  8. H. Ryde
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  9. Th. Lindblad
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  10. A. Johnson
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  11. S. A. Hjorth
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  12. J. Blomqvist
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Additional information

Alexander von Humboldt fellow 1978–80. On leave from University of Jyväskylä, Finland

On leave from Osaka University, Japan

First results on the high spin structure of149Gd came from measurements in 1972 at the Berkeley 88′ cyclotron, and we are indebted to M.R. Maier, R.M. Diamond, F.S. Stephens, and R.K. Sheline who participated in these early experiments. We thank M. Ogawa and R. Broda for their expert help during the measurements at Jülich, and we warmly acknowledge valuable and productive discussions with O. Schult. This work has been supported by a travel grant from the Nordic Committee for Accelerator-based Research.

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Piiparinen, M., Pengo, R., Nagai, Y. et al. High spin shell model excitations in149Gd. Z Physik A 300, 133–142 (1981). https://doi.org/10.1007/BF01412290

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  • DOI: https://doi.org/10.1007/BF01412290

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