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Systematic behavior ofB(E2) values in the yrast bands of doubly even nuclei

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

The experimental information onB(E2) transition rates in the yrast bands of doubly even nuclei (126≦A≦184) is systematized. The strength functionS exp≡B(E2,I→I−2)×E(I→I−2) is found to reveal characteristic behavior significant for structure studies of yrast bands. The energy-weightedB(E2,I→I−2) values (S exp) and 2ℐ/ℏ2(ℐ: moment of inertia) are plotted versus the rotational frequency squared ℏ2ω2 for each nucleus. In strongly deformed nuclei (N≧90), theS exp curves smoothly increase for low rotational frequencies suggesting that up to spin valuesI≈8 the ratioQ 20 ℐ is nearly constant (Q 0: quadrupole moment). This is not the case in nuclei with a soft core (N≦88). In the relevant discussion, the hydrodynamical model as well as the CAP effect are considered. The results in the backbending region are qualitatively discussed in terms of the two-band crossing model. Evidence is found supporting the prediction of an oscillating behavior of the yrast-yrare interaction.

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Authors and Affiliations

  1. Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria

    W. Andrejtscheff, E. Nadjakov & Ts. Venkova

  2. Nuclear Physics Laboratory, Rutgers University, New Brunswick, New Jersey, USA

    W. Andrejtscheff

Authors
  1. W. Andrejtscheff
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  2. E. Nadjakov
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  3. Ts. Venkova
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Additional information

Supported in part by the National Science Foundation

The authors thank S.A. Hjorth, as well as R.A. Sorensen, L. Zamick, and C. Glashausser, for reading the manuscript and critical remarks concerning different aspects of the topic studied in this paper. Discussions with G. Kyrchev and R. Nojarov at an earlier stage of the work are greatly appreciated.

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Andrejtscheff, W., Nadjakov, E. & Venkova, T. Systematic behavior ofB(E2) values in the yrast bands of doubly even nuclei. Z Physik A 296, 123–132 (1980). https://doi.org/10.1007/BF01412653

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  • DOI: https://doi.org/10.1007/BF01412653

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