Sub-barrier fusion of 1H and 4He: Empirical and theoretical barriers for fusion and evaporation

  • Louis C. Vaz
  • John M. Alexander
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 219)


Fusion excitation functions for 1H and 4He have been compared to a one-dimensional, barrier-penetration model. In contrast to fusion for heavier nuclei this simple model is completely adequate, except for the statically deformed target 233U. Empirical barrier heights are obtained and compared to those from two theoretical nuclear potentials. These empirical barriers (from cold reactants) are used as input for calculating evaporation spectra that arise from hot nuclear emitters. The excess of observed low-energy 1H and 4He emission signals information content concerning distortions of the hot nuclei.


Fusion Cross Section Total Reaction Cross Section Fusion Barrier Imaginary Potential Proximity Potential 
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  1. 1.
    L. C. Vaz, J.M. Alexander, and G. R. Satchler, Phys. Rpts. 69, 373 (1981).Google Scholar
  2. 2.
    R. G. Stokstad, Y. Eisen, S. Kaplanis, D. Pelte, U. Smilanskyand I. Tserruya, Phys. Rev. Lett. 41, 465 (1978); Phys. Rev. C 21, 2427 (1980).Google Scholar
  3. 3.
    R. G. Stokstad, W. Reisdorf, K. D. Hildenbrand, J. V. Kratz, G. Wirth, R. Lucas and J. Poitou, Z. Phys. A 295, 269 (1980).Google Scholar
  4. 4.
    R. G. Stokstad and E. E. Gross, Phys. Rev. C 23, 281 (1981).Google Scholar
  5. 5.
    M. J. Rhodes-Brown and P. Braun-Munzinger, Phys. Lett. 136B, 19 (1984)Google Scholar
  6. 6.
    M. J. Rhodes-Brown and M. Prakash, Preprint, Stony Brook (1984).Google Scholar
  7. 7.
    R. A. Broglie, C. H. Dasso, S. Landowne and G. Pollarolo Phys. Lett. B133, 34 (1983).Google Scholar
  8. 8.
    L. C. Vaz, J. M. Alexander, M. Prakash and S. Y. Lee, Proc. Int. Conference on Nuclear Physics with Heavy Ions, Stony Brook, N.Y. (1983), pp. 31–55, Vol. 6 Nucl. Sci. Res. Conf. Series (Harwood Academic Publishers, Amsterdam), edited P. Braun-Munzinger.Google Scholar
  9. 9.
    H. J. Krappe, M. Mahring, M. C. Names, and H. Rossner, Z. Phys. A, Atoms and Nuclei 313, 23 (1983).Google Scholar
  10. 10.
    J. Wing and J. R. Huizenga, Phys. Rev. 128, 2809 (1962).Google Scholar
  11. 11.
    G. L. Bate and J. R. Huizenga, Phys. Rev. 133B, 1471 (1964)Google Scholar
  12. 12.
    C. H. Johnson and R. L. Kernell, Phys. Rev. C20, 639 (1970).Google Scholar
  13. 13.
    A. R. Barnett and J. S. Lilley, Phys. Rev. C9, 2010 (1974).Google Scholar
  14. 14.
    H. Freiesleben and J. R. Huizenga, Nue. Phys. A224, 503 (1974) and J. R. Huizenga, R. Vandenbosch and H. Warhanek, Phys. Rev. 124, 1964 (1961).Google Scholar
  15. 15.
    J. M. Alexander, L. C. Vaz and S. Y. Lin, Phys. Rev. Lett. 33, 1487 (1974)Google Scholar
  16. 16.
    M. Broda, M. Ishihara, B. Herskind, H. Oeschler, S. Ogaza and H. Ryde, Nucl. Phys. A2, 356 (1975)Google Scholar
  17. 17.
    C. H. Johnson, J. K. Bair, C. M. Jones, S. K. Penny and D.W. Smith, Phys. Rev. C15, 196 (1977).Google Scholar
  18. 18.
    K. A. Eberhard, Ch. Appel, R. Bangert, L. Cleeman, J. Eberth and V. Zobel, Phys. Rev. Lett. 43, 107 (1979).Google Scholar
  19. 19.
    C. H. Johnson, A. Galonsky and R. L. Kernell, Phys. Rev. C20, 2052 (1979).Google Scholar
  20. 20.
    H. Vonach, R. C. Haight and G. Winkler, Phys. Rev. C28, 2278 (1983).Google Scholar
  21. 21.
    A. A. McMahan and J.M. Alexander, Phys. Rev. C21, 1261 (1980).Google Scholar
  22. 22.
    L. C. Vaz, J.M. Alexander, E. H. Auerbach, Phys. Rev. C18, 820 (1978).Google Scholar
  23. 23.
    L.C. Vaz and J.M. Alexander, Phys. Rev. C18, 833 (1978).Google Scholar
  24. 24.
    H. Delagrange, L. C. Vaz and J. M. Alexander, Phys. Rev. C20, 1731 (1979).Google Scholar
  25. 25.
    J. Blocki, J. Randrup, W. J. Swiatecki and C. F. Tsang, Ann. Phys. (New York) 105, 427 (1977); J. Randrup, Nuc. Phys. A307, 319 (1978).Google Scholar
  26. 26.
    S. L. Tabor, D. A. Goldberg and J. R. Huizenga, Phys. Rev. Lett. 41, 1285 (1978)Google Scholar
  27. 27.
    O. Akyuz and A. Winther, in Proceedings of the Enrico Fermi International School of Physics, 1979 (ed. R. A. Broglia, C. H. Dasso and R. Ricci) (Amsterdam: North Holland) p. 492; and as discussed by R. A. Broglia and and A. Winther, Heavy Ion Reactions, Benjamin/Cummings (1981)Google Scholar
  28. 28.
    L. D. Landau and E. M. Lifshitz, Quantum Mechanics: Non-Relativistic Theory, Pergamon Press (1965).Google Scholar
  29. 29.
    D. L. Hill and J. A. Wheeler, Phys. Rev. 89, 1102 (1953).Google Scholar
  30. 30.
    C. M Perey and F.G. Perey, At. Data and N. Data Tables 17, 1 (1976).Google Scholar
  31. 31.
    J. R. Huizenga and G. Igo, Nucl. Phys. 29, 462 (1962).Google Scholar
  32. 32.
    L. McFadden and G. R. Satchler, Nuc. Phys. 84, 177 (1966).Google Scholar
  33. 33.
    T. Ericson, Adv. in Phys. 9, 425, (1960).Google Scholar
  34. 34.
    L. C. Vaz, D. Logan, E. Duek, J.M. Alexander, M.F. Rivet, M. S. Zisman, M. Kaplan and J. W. Ball, Z. Phys. A, Atoms and Nuclei 305, 169 (1984), and references therein.Google Scholar
  35. 35.
    D. J. Moses, M. Kaplan, J.M. Alexander, D. Logan, M. Kildir, L.C. Vaz, N. N. Ajitanand, E. Duek, and M. S. Zisman, Preprint Carnegie-Mellon University, March 1984 and to be published.Google Scholar
  36. 36.
    M. Blann and T. T. Komoto, Phys. Rev. C24, 426 (1981).Google Scholar
  37. 37.
    R. K. Choudury, P.L. Gonthier, K. Hegel, M.N. Namboodiri, J.B. Natowitz, L. Adler, S. Simon, S. Kniffen and G. Berkowitz, Preprint (1984)Google Scholar
  38. 38.
    M. F. Rivet, D. Logan, J. M. Alexander, D. Guerreau, E. Duek, M. S. Zisman and M. Kaplan, Phys. Rev. C25, 2430 (1982).Google Scholar
  39. 39.
    J. M. Alexander, H. Delagrange, M. Rajagopalan, M. F. Rivet and L. C. Vaz, Z. Phys. A307, 149 (1982).Google Scholar
  40. 40.
    E. Tomasi, X. S. Chen, S. Leray, C. Ngo, M. Barranco, X. Vinas, H. Ngo, Nucl. Phys. A389, 69 (1982).Google Scholar
  41. 41.
    S. Cohen, F. Plasil, W.J. Swiatecki, Ann. Phys. (NY) 82, 557 (1974).Google Scholar
  42. 42.
    D. Agassi, C. M. Ko, H. A. Weidenmuller, Ann. Phys. (NY) 107, 140 (l977).Google Scholar
  43. 43.
    J. M. Alexander, D. Guerreau and L. C. Vaz, Z. Phys. A305, 313 (1982).Google Scholar

Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Louis C. Vaz
    • 1
  • John M. Alexander
    • 1
  1. 1.Department of ChemistryState University of New York at Stony BrookStony Brook

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