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Interaction strength and shape difference for the h9/2 and h11/2 configurations in163Tm

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

Abstract

The strongly shape driving πh9/2[541]l/2− configuration with α=+1/2 exhibits some anomalous, and so far unexplained, features concerning the crossing frequency, ħωc, the aligned angular momentum, ix, and interaction strength, at the alignment of the first pair of i13/2 quasineutrons in several odd-Z rare earth-nuclei. The h9/2[541]1/2− and h11/2[523]7/2− bands have been studied in the stably deformed rare-earth nucleus163Tm to investigate these features. A difference in band crossing frequency of ∼ 80 keV between the two bands is found. Rotational bands built on these two configurations have been found to cross in the spin range I=25/2–29/2 ħ. Theγ-decay pattern between the two bands is established in the crossing region and analysed in terms of a moderate shape difference between them. A theoretical estimate of the size of the interaction strength between the two bands is presented and compared to the experimental value. The observed band structure in163Tm is very similar to that of167Lu which has 2 protons and 2 neutrons in addition. This observation is discussed in relation to the similarity of the yrast bands of the two even-even “core” nuclei162Er and166Yb, for which theγ-transition energies are identical within ∼0.2 keV below the vi13/2 crossing.

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Authors and Affiliations

  1. The Niels Bohr Institute, University of Copenhagen, Denmark

    H. J. Jensen, G. B. Hagemann, S. Frauendorf, A. Atac, B. Herskind, R. M. Lieder, A. Maj, J. Nyberg, M. Sugawara & A. Virtanen

  2. Department of Physics, University of Oslo, Norway

    P. O. Tjøm & F. Ingebretsen

  3. Department of Physics, University of Lund, Sweden

    M. Bergström, A. Brockstedt, H. Carlsson, P. Ekström, A. Nordlund & H. Ryde

  4. Departamento di Fisica Atomica, Molecular y Nuclear, Universida de Sevilla, Spain

    J. M. Espino

  5. Dipartimento di Fisica, Universita di Milano, Italy

    A. Bracco, S. Leoni & B. Million

  6. Kernfysisch Versneller Instituut, Groningen, The Netherlands

    J. Jongman

  7. Department of Physics, Åbo Akademi, Finland

    T. Lönnroth

  8. Department of Physics, University of Jyväskylä, Finland

    M. Piiparinen

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  1. H. J. Jensen
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Additional information

Dedicated to Prof. Dr. P. Kienle on the occasion of his 60th birthday

Stimulating discussions with P.M. Walker, C.-H. Yu and R. Bengtsson are gratefully acknowledged. The authors are indebted to I. Hamamoto for communicating the results of her calculations and for critical comments. This project was supported by the Danish Natural Science Foundation, the NORDBALL collaboration, the Nordic Committee for Accelerator Based Research, the Swedish Natural Science Research Council, the Finish Academy, Commemoration Association for the Japan World Exposition [Quantum Physics Exchange Program between Japan and Denmark (NBI)], the Danish Research Academy, the Humboldt Foundation and Istituto Nazionale di Fisica Nucleare (INFN).

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Jensen, H.J., Hagemann, G.B., Tjøm, P.O. et al. Interaction strength and shape difference for the h9/2 and h11/2 configurations in163Tm. Z. Physik A - Hadrons and Nuclei 340, 351–362 (1991). https://doi.org/10.1007/BF01290322

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  • DOI: https://doi.org/10.1007/BF01290322

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