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Shell model and octupole states in148Gd from in-beam experiments

  • Nuclear Structure and Reactions
  • Published:
Zeitschrift für Physik A Atomic Nuclei

Abstract

Through (α, 4n) and (τ, 3n) reactions the high-spin states in the two-neutron nucleus148Gd were populated up toI π=21− at 7.2 MeV, including numerous states above the yrast line. The148Gd energy spectrum is interpreted in terms of the spherical shell model. Identification of the (νf 7/2 i 1 3/2)10− state gives the νi 13/2 single particle energy free of octupole admixtures as 2.1(1) MeV. Eight high-spin states between 1.2 and 3.7 MeV were identified as the couplings of the two valence-particles to the146Gd octupole phonon, and three above-lying levels are assigned as double-octupole excitations including a 12+ state which decays by anE3-E3 stretched cascade. All these octupole levels can be quantitatively predicted from the one-particle x phonon spectrum of147Gd. The high-spin states above 3 MeV are four-quasiparticle excitations ofπ +1 π −1 ν 2 andπ 2 ν 2 type and their energies are in good accord with shell model estimates.

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Authors and Affiliations

  1. Institut für Kernphysik, Forschungszentrum Jülich, Postfach 1913, W-5170, Jülich 1, Germany

    M. Piiparinen, P. Kleinheinz, S. Lunardi, M. Ogawa, G. de Angelis & W. Meczynski

  2. Department of Physics, University of Jyväskylä, Seminaarinkatu 15, SF-40100, Jyväskylä, Finland

    M. Piiparinen

  3. Department of Physics and INFN, Via F. Marzolo, 8, I-35131, Padova, Italy

    S. Lunardi, F. Soramel & W. Meczynski

  4. Manne Siegbahninstitutet, Raslagsvägen 100, S-10405, Stockholm 50, Sweden

    J. Blomqvist

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  1. M. Piiparinen
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  2. P. Kleinheinz
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  7. W. Meczynski
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Additional information

Alexander von Humboldt fellow at the Institut für Kernphysik, KFA Jülich

We thank M.R. Maier who participated in the early stages of the present study, and M. Lach who intensely collaborated with us in analyzing the148Gd octupole excitations. M. Morando, and C. Signorini provided vital support for the experiment in Padova. We acknowledge fruitful discussions and valuable suggestions from P.J. Daly and O. Schult.

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Piiparinen, M., Kleinheinz, P., Lunardi, S. et al. Shell model and octupole states in148Gd from in-beam experiments. Z. Physik A - Atomic Nuclei 337, 387–406 (1990). https://doi.org/10.1007/BF01294976

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