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Structure of theN=59 nucleus97Sr: coexistence of spherical and deformed states

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

Abstract

A band with a rotational pattern based on a state at 585.1 keV has been identified in theN=59 neutron-rich nucleus97Sr. Its properties lead to the [422] 3/2 Nilsson-orbital assignment for the band head. There is evidence for a second band with the head at 644.7 keV and the configuration [541] 3/2. Since the ground state and the lowest excited levels are spherical, shape coexistence is established for97Sr. A deformed nature of several levels at 500–600 keV results also from QRPA-model calculations. The structure of the low-lying spherical levels has been studied in the frame of the IBF model. The results of the present investigations lead to a better understanding of theN=59 isotones which constitute the link between the spherical and deformed nuclei atA∼100 as a species with shape coexistence but without any indications of particular softness.

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Authors and Affiliations

  1. Institut für Kernchemie, Universität Mainz, Germany

    G. Lhersonneau, B. Pfeiffer & K. -L. Kratz

  2. Institut für Kernphysik, KFA Jülich, Germany

    H. Ohm & K. Sistemich

  3. Prirodoslovno-matematicki fakultet, University of Zagreb, Yugoslavia

    S. Brant & V. Paar

Authors
  1. G. Lhersonneau
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  2. B. Pfeiffer
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  3. K. -L. Kratz
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  4. H. Ohm
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  5. K. Sistemich
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  6. S. Brant
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  7. V. Paar
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Additional information

The authors are much indebted to Dr. U. Stöhlker for the maintenance of the OSTIS separator. They are grateful to P. Möller for providing his QRPA code, and to J. Dudek and W. Nazarewicz for making available a copy of their Woods-Saxon code. They also would like to thank Mr. A. Wöhr, Mrs. C. Strauch and Mr. W. Kelp for their help during preparation of the manuscript.

This work was supported by the German Federal Minister for Research under contract O 6 MZ 106 and by the Internationales Büro of the KFA Jülich.

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Lhersonneau, G., Pfeiffer, B., Kratz, K.L. et al. Structure of theN=59 nucleus97Sr: coexistence of spherical and deformed states. Z. Physik A - Atomic Nuclei 337, 149–159 (1990). https://doi.org/10.1007/BF01294286

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  • DOI: https://doi.org/10.1007/BF01294286

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