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High-spin levels in137,139Ce and139,141Nd evidence for hole-core coupling

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

Excited states of the137Ce,139Ce,139Nd and141Nd nuclei have been studied using the138Ba(α, 5nγ)137Ce,138Ba(3He, 4nγ)137Ce,138Ba(α, 3nγ)139Ce,140Ce(α, 5nγ)139Nd,140Ce(3He,4nγ)139Nd,140Ce(α, 3nγ)141Nd and142Ce(α, 5nγ)141Nd reactions. Singlesγ-ray spectra,γ —γ coincidence spectra, angular distributions and time distributions ofγ-rays with respect to beam pulses have been measured. Gamma transitions between excited states with spin values up to 21/2, 23/2 or 25/2 have been observed. Isomeric states with T1/2=70 ns have been observed in139Ce at 2631.5 keV (19/2) and in141Nd probably at 2952.0 keV (19/2).

The level structure observed in the nuclei studied can be explained if the neutron-holes are coupled to the doubly even core excitations. The coupling of theh 11/2 neutron-hole with the 2+, 4+ and 3− collective excitations are calculated in terms of the weak and intermediate coupling models. The intermediate coupling results seem to be in better agreement with the experimental data. The energies of theree-particle states, being the result of the coupling of theh 11/2 neutron-hole with the two-proton excitations in the core, are well reproduced in the calculations when empirical values of the two-body interaction matrix elements were used.

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Author notes

  1. Jerzy Ludziejewski

    Present address: Natuurkundig Laboratorium, Vrije Universiteit, De Boelelaan, 1081, Amsterdam-Buitenveldert, Holland

Authors and Affiliations

  1. Dept. of Physics IA, Institute of Nuclear Research, Swierk, Otwock, Poland

    Jerzy Ludziejewski

  2. Instituut voor Kernphysisch Onderzoek, Amsterdam, The Netherlands

    Hans Arnold

Authors
  1. Jerzy Ludziejewski
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  2. Hans Arnold
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Additional information

The authors would like to thank Prof. Dr. A.H. Wapstra and Prof. Dr. Z. Sujkowski for their kind interest in this work and stimulating discussions. We are also indebted to Prof. I. Bergstrom for making accessible to us the AFI cyclotron to supplement the data for141Nd. Our thanks go also to Dr. J. Blocki for many valuable discussions and comments concerning the theoretical problems, and to Dr. A. Lukasiak for making his computer program on bound states available to us. One of us (J.L.) is grateful for the hospitality received at the IKO during a research visit on an IAEA fellowship.

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Ludziejewski, J., Arnold, H. High-spin levels in137,139Ce and139,141Nd evidence for hole-core coupling. Z Physik A 281, 287–308 (1977). https://doi.org/10.1007/BF01408848

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  • DOI: https://doi.org/10.1007/BF01408848

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