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The reaction mechanism in the system132Xe+56Fe at 5.73 MeV/u: Evidence for a new type of strongly damped collisions

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

We present data for the132Xe+56Fe-system at 5.73 MeV/u laboratory energy. Due to inverted kinematics, where Xe is the projectile, we were able to measure energy spectra as well as angular distributions for reaction products with 20≦Z≦60 with unitZ-resolution; i.e. target- and projectile-like fragments have been investigated. The reaction shows a well focussed quasielastic component, where charge transfer from the light to the heavy collision partner dominates. This apparent tendency towards more asymmetric fragmentation is explained by a potential energy surface which favours such charge transfer in order to minimize the asymmetry energy of the liquid drop. The strongly damped component which constitutes the major part of the reaction cross section exhibits characteristics of a fusion-fission reaction with typical fission fragment kinetic energies and 1/sinΘ c.m. angular distributions.

The maximum cross section is found for the symmetric fragmentation, no clear indication is observed for a diffusion process leading to target- and projectile-like fragments. Our data are difficult to reconcile either with the standard diffusion models or with an equilibrated compound nucleus fission picture. We tentatively conclude that an essential part of the fully damped cross section originates from partial waves for which the compound nucleus has no fission barrier.

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References

  1. See references in W.U. Schröder, J.R. Huizenga: Ann. Rev. Nucl. Sci.27, 465 (1977)

    Google Scholar 

  2. Wolf, K.L., Roche, C.T.: Proceedings of the Symposium on the Macroscopic Features of Heavy Ion Collisions, Argonne National Laboratory Report ANL/PHY-76-2, 1976, p. 295

  3. Britt, H.C., Erkkila, B.H., Stokes, R.H., Gutbrod, H.H., Plasil, F., Ferguson, R.L., Blann, M.: Phys. Rev. C13, 1483 (1976)

    Google Scholar 

  4. Mathews, G.J., Wozniak, G.J., Schmitt, R.P., Moretto, L.G.: Z. Physik A283, 247 (1977)

    Google Scholar 

  5. Nörenberg, W.: Phys. Lett.53B, 289 (1974); Z. Physik A274, 241 (1975)

    Google Scholar 

  6. Nix, J.R.: Nucl. Phys. A130, 241 (1969)

    Google Scholar 

  7. Cohen, S., Plasil, F., Swiatecki, W.J.: Ann. Phys.82, 557 (1974)

    Google Scholar 

  8. Artukh, A.G., Gridnev, G.F., Mikheev, V.L., Volkov, V.V., Wilczyński, J.: Nucl. Phys. A215, 91 (1973)

    Google Scholar 

  9. Wolf, K.L., Unik, J.P., Huizenga, J.R., Birkelund, J.R., Freiesleben, H., Viola, V.E.: Phys. Rev. Lett.33, 1105 (1974)

    Google Scholar 

  10. Hanappe, F., Lefort, M., Ngô, C., Péter, J., Tamain, B.: Phys. Rev. Lett.32, 738 (1974)

    Google Scholar 

  11. Pfeffer, W.: Ph. D. Thesis, University of Marburg, 1976

  12. Gamp, A., Bohne, W., Braun-Munzinger, P., Gelbke, C.K.: Nucl. Inst. Meth.120, 281 (1974)

    Google Scholar 

  13. Chestnut, R.P., Grasmück, B., Hadsell, R.W., Lebershausen, W., Plappert, W., Richter, M., Rother, H. P., Siart, O.: EDAS/ GSI-experimental-data-aquisition-system, GSI-report 1977

  14. Viola, V.E. jr.: Nucl. Data A1, 391 (1966)

    Google Scholar 

  15. Blair, J.S.: Phys. Rev.95, 1218 (1954)

    Google Scholar 

  16. Genoa-Code by Perey, F., revised version by Nilsson, B., NBI Copenhagen

  17. Myers, W.D., Swiatecki, W.J.: LRL-report, UCRL-11980, 1965

  18. Myers, W.D., Swiatecki, W.J.: Arkiv Fysik36, 343 (1967)

    Google Scholar 

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

    Google Scholar 

  20. Gatty, B., Guerreau, D., Lefort, M., Tarrago, X., Galin, J., Cauvin, B., Girard, J., Nifenecker, H.: Nucl. Phys. A253, 511 (1975)

    Google Scholar 

  21. Kratz, J.V., Ahrens, H., Bögl, W., Brüchle, W., Franz, G., Schädel, M., Warnecke, I., Wirth, G., Klein, G., Weis, M.: Phys. Rev. Lett.39, 984 (1977) Kratz, J.V.: private communication

    Google Scholar 

  22. Buttle, P.J.A., Goldfarb, L.J.B.: Nucl. Phys. A176, 299 (1971)

    Google Scholar 

  23. Galin, J.: J. de Physique C5, 83 (1976)

    Google Scholar 

  24. Moretto, L.G., Schmitt, R.: J. de Physique C5, 109 (1976)

    Google Scholar 

  25. Borderie, B., Hanappe, F., Ngô, C., Péter, J., Tamain, B.: Nucl. Phys. A220, 93 (1974)

    Google Scholar 

  26. Ngô, C., Péter, J., Tamain, B., Berlanger, M., Hanappe, F.: Z. Physik A283, 161 (1977)

    Google Scholar 

  27. Galin, J., Gatty, B., Guerreau, D., Lefort, M., Tarrago, X., Agarwal, S., Babinet, R., Cauvin, B., Girard, J., Nifenecker, H.: Z. Physik A283, 173 (1977)

    Google Scholar 

  28. Moretto, L.G., Galin, J., Babinet, R., Fraenkel, Z., Schmitt, R., Jared, R., Thompson, S.G.: Nucl. Phys. A259, 172 (1976)

    Google Scholar 

  29. Habbestad-Wätzig, A.M., Esterlund, R.A., Reus, U., Westmeier, W., Wätzig, W., Patzelt, P.: to be published

  30. Moretto, L.G., Sventek, J.S.: Phys. Lett.58B, 26 (1975)

    Google Scholar 

  31. Wolschin, G.: private communication

  32. Bass, R.: Phys. Lett. B47, 139 (1973); Nucl. Phys. A231, 45 (1974)

    Google Scholar 

  33. Randrup, J.: Nordita preprint 1977

  34. We thank J.R. Birkelund and J.R. Huizenga for letting us use their computer program

  35. Plasil, F., Burnett, D.S., Britt, H.C., Thompson, S.G.: Phys. Rev.142, 696 (1965)

    Google Scholar 

  36. Sikkeland, T.: Phys. Lett.31 B, 451 (1970)

    Google Scholar 

  37. Ngô, C., Péter, J., Tamain, B.: Proceedings of the International Conference on Reactions between Complex Nuclei, Nashville 1974, Vol. 1, p. 114

    Google Scholar 

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On leave from University of Marburg, Federal Republic of Germany

We would like to express our gratitude to the UNILAC staff for providing an excellent beam even in the early stage of operation and the data-aquisition-group for extensive support. We also acknowledge stimulating and clarifying discussions with H.C. Britt, W. Nörenberg and G. Wolschin. Two of us (B. H. and C.V.) want to thank Professor R. Bock and GSI for the kind hospitality during their stay at Darmstadt.

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Heusch, B., Volant, C., Freiesleben, H. et al. The reaction mechanism in the system132Xe+56Fe at 5.73 MeV/u: Evidence for a new type of strongly damped collisions. Z Physik A 288, 391–400 (1978). https://doi.org/10.1007/BF01417723

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  • DOI: https://doi.org/10.1007/BF01417723

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