Zeitschrift für Physik A Atoms and Nuclei

, Volume 281, Issue 3, pp 287–308 | Cite as

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

  • Jerzy Ludziejewski
  • Hans Arnold
Article
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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 theh11/2 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 theh11/2 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.

Keywords

Excited State Angular Distribution Coupling Model Time Distribution Level Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

  1. 1.
    Van Hise, J.R., Ketele, B.H., Brosi, A.R.: Phys. Rev.153, 1287 (1967)Google Scholar
  2. 2.
    Beery, D.B., Kelly, W.H., McHarris, Wm.C.: Phys. Rev.188, 1875 (1969)Google Scholar
  3. 3.
    Zalutsky, M.R., Macias, E.S., Meyer, R.A.: Phys. Rev. C13, 1590 (1976)Google Scholar
  4. 4.
    Proc. Int. Conf. On the Properties of Nuclei Far from the Region of beta stability, Switzerland (1970)Google Scholar
  5. 5.
    Jolly, R.K., Kashy, E.: Phys. Rev; C4, 887 (1971) and Phys. Rev. C4, 1398 (1971)Google Scholar
  6. 6.
    Chaumeaux, A., Brugge, G., Faraggi, H., Picard, J.: Nucl. Phys. A164, 176 (1971)Google Scholar
  7. 7.
    Heyde, K., Brussaard, P.J.: Z. Physik259, 15 (1973)Google Scholar
  8. 8.
    Kownacki, J., Ludziejewski, J., Sujkowski, Z., Arnold, H., Ryde, H.: Nucl. Phys. A236, 125 (1974)Google Scholar
  9. 9.
    Ludziejewski, J., Arnold, H.: Z. Physik A277, 357 (1976)Google Scholar
  10. 10.
    Baer, H.W., Baidy, J.J., Wiedenbeck, M.L.: Nucl. Phys. A113, 33 (1968)Google Scholar
  11. 11.
    Kownacki, J., Ryde, H., Siergiejev, V.O., Sujkowski, Z.: Nucl. Phys. A196, 498 (1972)Google Scholar
  12. 12.
    Heyde, K., Waroquier, M., van den Berge, G.: Phys. Lett.35B, 211 (1971)Google Scholar
  13. 13.
    Ludziejewski, J., Koldewijn, P., Arnold, H.: Nucl. Phys. A184, 473 (1972)Google Scholar
  14. 14.
    Barker, J.H., Hiebert, J.: Phys. Rev. C4, 2256 (1971)Google Scholar
  15. 15.
    Baker, F.T., Ticle, R.: Phys. Rev. C5, 182 (1972)Google Scholar
  16. 16.
    Eceleshal, D., Yates, M.I.L., Simpson, J.J.: Nucl. Phys.78, 481 (1966)Google Scholar
  17. 17.
    Nathan, O., Popov, V.I.: Nucl. Phys.21, 631 (1960)Google Scholar
  18. 18.
    Bohr, A., Mottelson, B.R.: Dan. Mat. Fys. Medd.27, 16 (1953)Google Scholar
  19. 19.
    Mottelson, B.R.: Proc. Int. Conf. on Nuclear Structure, Tokyo (1967)Google Scholar
  20. 20.
    Siegbahn, K.: Alpha-beta- and gamma-ray spectroscopy, p. 631. Amsterdam: North Holland Publ. Comp. 1968Google Scholar
  21. 21.
    Choudhury, D.C.: Dan. Mat. Fys. Medd.28 N4 (1954)Google Scholar
  22. 22.
    Choudhury, D.C., Friedman, J.N.: Phys. Rev. C3, 1619 (1971)Google Scholar
  23. 23.
    Wildental, B.H., Newman, E., Auble, R.L.: Phys. Rev. C3, 1199 (1971)Google Scholar
  24. 24.
    De-Shalit, A., Talmi, I.: Nuclear Shell Theory. New York: Academic Press 1963Google Scholar
  25. 25.
    Lasijo, R., Sheline, R.K., Griffion, R.D., Du Bard, J.L.: Z. Physik253, 17 (1972)Google Scholar
  26. 26.
    Funke, L., Fromm, W.D., Keller, H.I., Arlt, R.: Proceeidings of XIII Meeting on Nuclear Spectroscopy and Theory of Nuclei, Dubna, (1973) p. 102Google Scholar
  27. 27.
    Ludziejewski, J., Białkowski, J., Haratym, Z., De Geer, L.E., Kerek, A., Kozyczkowski, J.: Physica Scripta14, 133 (1976)Google Scholar

Copyright information

© Springer-Verlag 1977

Authors and Affiliations

  • Jerzy Ludziejewski
    • 1
  • Hans Arnold
    • 2
  1. 1.Dept. of Physics IAInstitute of Nuclear ResearchSwierkPoland
  2. 2.Instituut voor Kernphysisch OnderzoekAmsterdamThe Netherlands

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