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Probing sub-barrier fusion and extra-push by measuring fermium evaporation residues in different heavy ion reactions

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

The production of fermium isotopes was attempted by complete fusion of different targets and projectiles spanning a wide range of effective entrance channel fissilities below and above the predicted threshold valuex threff ≃0.7. For the most asymmetric systems where fusion is expected to occur without dynamical hindrance we investigate to what extent the expected amount of sub-barrier fusion contributes to the production of fermium evaporation residues. For increasingly symmetric systems the experimental fusion barriers are found to exceed the fusion barriers predicted by the proximity formalism. The barrier heights are discussed in the framework of both the extra-push model and the surface friction model.

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References

  1. Stokstad, R.G., Reisdorf, W., Hildenbrand, K.D., Kratz, J.V., Wirth, G., Lucas, R., Poitou, J.: Z. Phys. A — Atoms and Nuclei295, 269 (1980)

    Google Scholar 

  2. Beckerman, M., Salomaa, M.K., Wiggins, J., Rohe, R.: Phys. Rev. Lett.50, 471 (1983)

    Google Scholar 

  3. Beckerman, M., Salomaa, M., Sperduto, A., Molitoris, J.D., Dirienzo, A.: Phys. Rev. C25, 837 (1982)

    Google Scholar 

  4. Reisdorf, W., Hessberger, F.P., Hildenbrand, K.D., Hofmann, S., Münzenberg, G., Schmidt, K.-H., Schneider, J.H.R., Schneider, W.F.W., Sümmerer, K., Wirth, G., Kratz, J.V., Schitt, K.: Phys. Rev. Lett.49, 1811 (1982)

    Google Scholar 

  5. Jahnke, U., Rossner, H.H., Hilscher, D., Holub, E.: Phys. Rev. Lett.48, 17 (1982)

    Google Scholar 

  6. Landowne, S., Nix, J.R.: Nucl. Phys. A368, 352 (1981)

    Google Scholar 

  7. Vaz, L.C., Alexander, J.M., Satchler, G.R.: Phys. Rev.69, No. 5, 373 (1981)

    Google Scholar 

  8. Broglia, R.A., Dasso, C.H., Landowne, S., Winther, A.: Phys. Rev. C27, 2433 (1983)

    Google Scholar 

  9. Swiatecki, W.J.: Prog. Particle and Nucl. Phys.4, 383 (1980)

    Google Scholar 

  10. Swiatecki, W.J.: Phys. Scr.24, 113 (1981)

    Google Scholar 

  11. Swiatecki, W.J.: Nucl. Phys. A376, 275 (1982)

    Google Scholar 

  12. Bjørnholm, S., Swiatecki, W.J.: Nucl. Phys. A391, 471 (1982)

    Google Scholar 

  13. Bock, R., Chu, Y.T., Dakowski, M., Gobbi, A., Grosse, E., Olmi, A., Sann, H., Schwalm, D., Lynen, U., Müller, W., Bjørnholm, S., Esbensen, H., Wölfli, W., Morenzoni, E.: Nucl. Phys. A388, 334 (1982)

    Google Scholar 

  14. Oganessian, Yu.Ts., Demin, A.G., Iljinov, A.S., Tretyakova, S.P., Pleve, A.A., Penionzhkevich, Yu.E., Ivanov, M.P., Tretyakov, Yu.P.: Nucl. Phys. A239, 157 (1975)

    Google Scholar 

  15. Gäggeler, H., Iljinov, A.S., Popeko, G.S., Seidel, W., Ter-Akopian, G.M., Tretyakova, S.P.: Z. Phys. A — Atoms and Nuclei289, 415 (1979)

    Google Scholar 

  16. Oganessian, Yu.Ts., Iljinov, A.S., Demin, A.G., Tretyakova, S.P.: Nucl. Phys. A239, 353 (1975)

    Google Scholar 

  17. Münzenberg, G., Hofmann, S., Faust, W., Hessberger, F.P., Reisdorf, W., Schmidt, K.-H., Kitahara, T., Armbruster, P., Güttner, K., Thuma, B., Vermeulen, D.: Z. Phys. A — Atoms and Nuclei302, 7 (1981)

    Google Scholar 

  18. Schulte, H.: Diplomawork, T.H. Darmstadt, Germany (unpublished) (1981)

  19. Clerc, H.-G., Keller, J.G., Sahm, C.C., Schmidt, K.-H., Schulte, H., Vermeulen, D.: GSI — Scientific Report 1982, p. 6, GSI 83-1 (1983)

  20. Gross, D.H.E., Nayak, R.C., Satpathy, L.: Z. Phys. A — Atoms and Nuclei299, 63 (1981)

    Google Scholar 

  21. Gross, D.H.E., Satpathy, L.: Phys. Lett.110B, 31 (1982)

    Google Scholar 

  22. Fröbrich, P.: Phys. Lett.122B, 338 (1983)

    Google Scholar 

  23. Gross, D.H.E.: Private communication (1983)

  24. Gäggeler, H., Brüchle, W., Kratz, J.V., Schädel, M., Sümmerer, K. Weber, W., Wirth, G., Herrmann, G.: Nucl. Instrum. Methods188, 367 (1981)

    Google Scholar 

  25. Marx, D., Nickel, F., Münzenberg, G., Güttner, K., Ewald, H., Faust, W., Hofmann, S., Schött, H.J., Thalheimer, W.: Nucl. Instrum. Methods163, 15 (1979)

    Google Scholar 

  26. Nurmia, M., Sikkeland, T., Silva, R., Ghiorso, A.: Phys. Lett.26B 78 (1967)

    Google Scholar 

  27. Hubert, F., Fleury, A., Bimbot, R., Gardés, D.: Ann. Phys.5 (Suppl.) (1980)

  28. Lützenkirchen, K., Kratz, J.V., Gäggeler, H., Brüchle, W., Sümmerer, K., Wirth, G.: Z. Phys. A — Atoms and Nuclei (in press)

  29. Nitschke, J.M., Leber, R.E., Nurmia, M.J., Ghiorso, A.: Nucl. Phys. A313, 236 (1979)

    Google Scholar 

  30. Ter-Akopian, G.M., Iljinov, A.S., Oganessian, Yu.Ts., Orlova, O.A., Popeko, G.S., Tretyakova, S.P., Chepigin, V.I., Shilov, B.V., Flerov, G.N.: Nucl. Phys. A255, 509 (1975)

    Google Scholar 

  31. Gäggeler, H., Seidel, W., Popeko, G.S., Smirnov, V.I., Subbotin, V.G., Ter-Akopian, G.M., Chelnokov, L.P.: Nucl. Instrum. Methods150, 173 (1978)

    Google Scholar 

  32. Münzenberg, G., Faust, W., Hofmann, S., Armbruster, P., Güttner, K., Ewald, H.: Nucl. Instrum. Methods161, 65 (1979)

    Google Scholar 

  33. Hill, D.L., Wheeler, J.A.: Phys. Rev.89, 1102 (1953)

    Google Scholar 

  34. Blocki, J., Randrup, J., Swiatecki, W.J., Tsang, C.F.: Ann. Phys.105, 427 (1977)

    Google Scholar 

  35. Scobel, W., Mignerey, A., Blann, M., Gutbrod, H.H.: Phys. Rev. C11, 1705 (1975)

    Google Scholar 

  36. Esbensen, H.: Nucl. Phys. A352, 147 (1981)

    Google Scholar 

  37. Reisdorf, W.: Z. Phys. A — Atoms and Nuclei300, 227 (1981), Reisdorf, W.: Annual Report GSI-81-2, Gesellschaft für Schwerionenforschung, Darmstadt, p. 73 (1981)

    Google Scholar 

  38. Cohen, S., Plasil, F., Swiatecki, W.J.: Ann. Phys.82, 596 (1974)

    Google Scholar 

  39. Myers, W.D., Swiatecki, W.J.: Nucl. Phys.81, 1 (1966)

    Google Scholar 

  40. Ignatyuk, A.V., Istekov, K.K., Okolovitch, V.N., Smirenskij, G.N.: Proc. Int. Symp. on Physics and Chemistry of Fission, Jülich 1979, IAEA-SM/241-C9 (1980)

  41. Schmidt, K.-H., Faust, W., Münzenberg, G., Reisdorf, W., Clerc, H.-G., Vermeulen, D., Lang, W.: Proc. Int. Symp. on Physics and Chemistry of Fission, Jülich 1979, IAEA — SM/241-C8 (1980)

  42. Reisdorf, W., Hessberger, F.P., Hildenbrand, K.D., Hofmann, S., Münzenberg, G., Schneider, J.H.R., Schneider, W.F.W., Sümmerer, K., Wirth, G., Kratz, J.V., Schlitt, K.: GSI — Scientific Report 1982, p. 3, GSI 83-1 (unpublished)

  43. Dahlinger, M., Vermeulen, D., Schmidt, K.-H.: Nucl. Phys. A376, 94 (1982)

    Google Scholar 

  44. Gäggeler, H., Brüchle, W., Kratz, J.V., Schädel, M., Sümmerer, K., Wirth, G., Sikkeland, T.: Proc. Int. Workshop on Gross Properties of Nuclei and Nuclear Excitation, Hirschegg, Austria, 1982, ISSN-0720-8715, p. 40 (1982) (unpublished)

  45. Sann, H., Bock, R., Chu., Y.T., Gobbi, A., Olmi, A., Lynen, U., Müller, W., Bjørnholm, S., Esbensen, H.: Phys. Rev. Lett47, 1248 (1981)

    Google Scholar 

  46. Westmeier, W., Esterlund, R.A., Rox, A., Patzelt, P.: Phys. Lett.117B 163 (1982)

    Google Scholar 

  47. Oganessian, Yu.Ts., Orlova, O.A., Ter-Akopian, G.M., Muzychka, Yu.A., Pleve, A.A., Pustylnik, W.I., Chepigin, V.I., Flerov, G.N.: Proc. Int. Symp. on Physics and Chemistry of Fission, Jülich 1979, IAEA-SM/241-B1 (1980)

  48. Schmidt, K.-H., Armbruster, P., Hessberger, F.P., Münzenberg, G., Reisdorf, W., Sahm, C.-C., Vermeulen, D., Clerc, H.-G., Keller, J., Schulte, H.: Z. Phys. A — Atoms and Nuclei301, 21 (1981)

    Google Scholar 

  49. Münzenberg, G.: Private communication (1982)

  50. Lützenkirchen, K., Kratz, J.V., Brüchle, W., Gäggeler, H., Sümmerer, K., Wirth, G.: GSI — Scientific Report 1982, p. 8, GSI 83-1 (1983), (unpublished)

  51. Münzenberg, G., Reisdorf, W., Hofmann, S., Agarwal, Y.K., Hessberger, F.P., Poppensieker, K., Schneider, J.R.H., Schneider, W.F.W., Schmidt, K.-H., Schött, H.-J., Armbruster, P., Sahm, C.-C., Vermeulen, D.: Z. Phys. A — Atoms and Nuclei315, 145 (1984)

    Google Scholar 

  52. Lützenkirchen, K., Kratz, J.V., Brüchle, W., Gäggeler, H., Sümmerer, K., Wirth, G.: GSI — Scientific Report 1982, p. 7, GSI 83-1 (1983), (unpublished)

  53. Kratz, J.V., Poitou, J., Brüchle, W., Gäggeler, H., Schädel, M., Wirth, G., Lucas, R.: Nucl. Phys. A357, 437 (1981)

    Google Scholar 

  54. Davies, K.Th.R., Sierk, A.J., Nix, J.R.: Phys. Rev. C28, 679 (1983)

    Google Scholar 

  55. Feldmeier, H.: Proc. Int. Workshop on Gross Properties of Nuclei and Nuclear Excitation, Hirschegg, Austria, 1982, ISSN-0720-8715, p. 26 (1982) (unpublished)

  56. See e.g. Kratz, J.V.: Radiochimica Acta32, 25 (1983)

    Google Scholar 

  57. Münzenberg, G., Armbruster, P., Faust, W., Güttner, G., Hessberger, F.P., Hofmann, S., Reisdorf, W., Sahm, C.C., Schmidt, K.-H., Schött, H.J., Thuma, B., Vermeulen, D.: Actinides in Perspective, Proc. of the Actinides — 1981 Conf., Pacific Grove, California, Ed. N.M. Edelstein, Pergamon Press, p. 223 (1982); and Münzenberg, G.: Private communication (1982)

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Author notes

  1. W. Bögl

    Present address: Bundesgesundheitsamt München, FRG

  2. G. Franz

    Present address: Bayer, Leverkusen, FRG

  3. J. V. Kratz

    Present address: Institut für Kernchemie, Universität Mainz, FRG

  4. W. Weber

    Present address: IBM, Sindelfingen, FRG

Authors and Affiliations

  1. Gesellschaft für Schwerionenforschung mbH, Darmstadt, Federal Republic of Germany

    H. Gäggeler, T. Sikkeland, G. Wirth, W. Brüchle, W. Bögl, G. Franz, G. Herrmann, J. V. Kratz, M. Schädel, K. Sümmerer & W. Weber

  2. Institut für Kernchemie, Universität Mainz, FRG

    G. Herrmann

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  1. H. Gäggeler
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Additional information

On leave from Technical University, Trondheim, Norway

We wish to thank the UNILAC staff for delivering high intensity beams of40Ar,76Ge,86Kr and136Xe. We are indebted to H. Folger for providing a large amount of isotopically enriched targets, H. Schulte for the permission to discuss the experimental40Ar+208Pb fusion-fission excitation function from his Diploma work [18] prior to publication and Mrs. U. Vogel for editing the manuscript. We especially want to thank W. Reisdorf for his help in performing the HIVAP calculations and for many fruitful advices and comments. Enlightening discussions with P. Armbruster, S. Bjørnholm, and W. Swiatecki are greatly appreciated.

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Gäggeler, H., Sikkeland, T., Wirth, G. et al. Probing sub-barrier fusion and extra-push by measuring fermium evaporation residues in different heavy ion reactions. Z Physik A 316, 291–307 (1984). https://doi.org/10.1007/BF01439902

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