Advertisement

Nuclear Structure Inferred from Heavy Ion Coulomb Excitation

  • Douglas Cline
Part of the Ettore Majorana International Science Series book series (EMISS, volume 10)

Abstract

Low-lying nuclear spectra in all nuclei exhibit to some extent, features characteristic of quadrupole collective modes of motion. Thus it is interesting to ascertain to what extent it is possible to describe nuclear properties using phenomenological collective models such as the Interacting Boson Modell or geometrical models since they can give a clear insight into the structure of a complex many body system. Nuclear E2 properties are a direct and unambiguous measure of the collective shape parameters for quadrupole collectivity. Unfortunately, this sensitivity could not be exploited fully in the past due to the sparseness of the available E2 data. Consequently most collective models have emphasized fits to level energies because of the extensive body of data available. However, the level energies of the collective states are sensitive to both microscopic and collective parameters. As a result the collective parameters extracted from level energies can be ambiguous. Coulomb excitation selectively excites collective states and the excitation cross sections are a direct measure of the strong E2 matrix elements. It is just these enhanced E2 matrix elements that collective models should predict the best. Recent advances in the field of Coulomb excitation makes it feasible, for the first time, to measure essentially all the E2 matrix elements for the low lying nuclear levels. These data should prove to be a stringent test of collective models. In particular it is now practical to use a simple model independent method for extracting collective parameters from E2 data. Application of these techniques to study heavy rotational and shape transitional nuclei and the model implications are discussed in this and the adjoining paper2.

Keywords

Collective Model Coulomb Excitation Interact Boson Model Collective Parameter Ground Band 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    F. Iachello, ed., “Interacting Bosons in Nuclear Physics,” Plenum Press, New York (1979).Google Scholar
  2. 2.
    L. Hasselgren and D. Cline, “Interacting Bose-Fermi Systems in Nuclei,” F. Iachello, ed., Plenum Press, New York (1980).Google Scholar
  3. 3.
    T. Czosnyka, C. Y. Wu and D. Cline, unpublished.Google Scholar
  4. 4.
    K. Kumar, Phys. Rev. Lett. 28:249 (1972).Google Scholar
  5. 5.
    D. Cline, “Proc. of the Orsay Colloquium on Intermediate Nuclei,” Foucher, Perrin and Veneroni, ed., p. 4 (1971).Google Scholar
  6. 6.
    D. Cline and C. Flaum, “Proc. of the Int. Conf. on Nucl. Struct. Studies Using Electron Scattering and Photoreaction, Sendai 1972,” K. Shoda and H. Ui, ed., Vol. 5, p. 61, Tohoku University, Sendai (1972).Google Scholar
  7. 7.
    J. N. Ginocchio and M. W. Kirson, Phys. Rev. Lett. 44:1744 (1980).Google Scholar
  8. 8.
    M. W. Guidry, P. A. Butler, P. Colombani, I. Y. Lee, D. Ward, R. M. Diamond, F. S. Stephens, E. Eichler, N. R. Johnson and R. Sturm, Nucl. Phys. A266: 228 (1976).Google Scholar
  9. 9.
    A. Gelberg, “Interacting Bose-Fermi Systems in Nuclei,” F. Iachello, ed., Plenum Press, New York (1980).Google Scholar
  10. 10.
    J. Stachel, ibid.Google Scholar
  11. 11.
    P. Russo, D. Cline, J. K. Sprinkle, R. P. Scharenberg and P. B. Vold, Bull. Am. Phys. Soc. 22:545 (1978).Google Scholar
  12. 12.
    J. K. Sprinkle, D. Cline, P. Russo, R. P. Scharenberg and P. B. Vold, Bull. Am. Phys. Soc. 22:545 (1978).Google Scholar
  13. 13.
    A. S. Davydov and G. F. Filippov, Nucl. Phys. 8:237 (1958)Google Scholar
  14. 14.
    K. Kumar and M. Baranger, Nucl. Phys. Al22:273 (1968).Google Scholar
  15. 15.
    R. Bijker, A. E. L. Dieperink, O. Scholten and R. Spanhoff, Preprint (1980).Google Scholar
  16. 16.
    K. J. Weeks and T. Tamura, Phys. Rev. C22:1323 (1980).Google Scholar
  17. 17.
    I. Y. Lee, D. Cline, P. A. Butler, R. M. Diamond, J. O. Newton, R. S. Simon and F. S. Stephens, Phys. Rev. Lett. 39:684 (1977).Google Scholar
  18. 18.
    D. Cline, “Lecture Notes in Physics 92, Nuclear Interaction,” B. A. Robson, ed., p. 39, Springer Verlag (1979).Google Scholar
  19. 19.
    C. Y. Wu, D. Cline, T. Czosnyka, L. Hasselgren, P. Russo, J. K. Sprinkle, I. Y. Lee, P. A. Butler, R. M. Diamond, F. S. Stephens, C. Baktash and S. Steadman, Bull. Am. Phys. Soc. 25:605 (1980).Google Scholar
  20. 20.
    M. Vergnes, “Interacting Bose-Fermi Systems in Nuclei,” F. Iachello, ed., Plenum Press, New York (1980).Google Scholar

Copyright information

© Springer Science+Business Media New York 1981

Authors and Affiliations

  • Douglas Cline
    • 1
  1. 1.Nuclear Structure Research LaboratoryUniversity of RochesterRochesterUSA

Personalised recommendations