Abstract
The velocity distributions of evaporation — residues produced in complete fusion reactions of20Ne+197Au at bombarding energies ofE/A=5.7, 8.6 and 11.4MeV/u were measured with use of the velocity filter SHIP. It could be shown, that the production cross section for evaporation residues is influenced by emission of fast, light particles having an angular distribution, that is peaked in forward direction (preequilibrium particles). This contribution is, however too small to explain the enhancement of the evaporation residue production cross section by about two orders of magnitude compared to statistical model calculations. This latter effect is interpreted as mainly due to a delayed onset of compound fission.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Bohr, N.: Nature137, 344 (1936)
Blann, M.: Phys. Rev. C23, 1, 205 (1981)
Blann, M.: Phys. Rev. C31, 4, 1245 (1985)
Siwek-Wilczynska, K., Voorthuysen, E.H., Du Marchie van, Popta, J. van, Siemssen, R.H., Wilczynski, J.: Nucl. Phys. A330, 150 (1979)
Wilczynski, J., Siwek-Wilczynska, K., Driel, J. van, Gonggrijb, S., Hageman, D.C.J.M., Janssens, R.V.F., Lukasiak, J., Siemssen, R.H., Werf, S.Y. van der: Nucl. Phys. A373, 109 (1982)
Grange, P., Weidenmüller, H.A.: Phys. Lett.96B, 1, 2, 26 (1980)
Delagrange, H., Gregoire, C., Scheuter, F., Abe, Y.: Z. Phys. A — Atomic Nuclei323, 437 (1986)
Westmeier, W., Esterlund, R.H.: Z. Phys. A — Atoms and Nuclei316, 27 (1984)
Hilscher, D., Rossner, H., Cramer, B., Gebauer, B., Jahnke, U., Lehmann, M., Schwinn, E., Wilpert, M., Wilpert, Th., Frobeen, H., Mordhorst, E., Scobel, W.: Phys. Rev. Lett.62, 10, 1099 (1989)
Natowitz, J.B., Gonin, M., Gui, M., Hagel, K., Utley, D., Wada, R.: Phys. Lett.247, 2, 3, 242 (1990)
Ikezoe, H., Shikazono, N., Nagame, Y., Sugiyama, Y., Tomita, Y., Ideno, K., Iwamoto, A., Ohtsuki, T.: Phys. Rev. C42, 1, 342 (1990)
Valli, K., Treytl, W.J., Hyde, E.K.: Phys. Rev.167, 4, 1094 (1968)
Fuchs, H., Bürgel, M., Homeyer, H., Ingold, G., Jahnke, U., Thoma, K.: Phys. Rev. C31, 2, 465 (1985)
Münzenberg, G., Faust, W., Hofmann, S., Armbruster, P., Güttner, K., Ewald, H.: Nucl. Instrum. Methods161, 65 (1979)
Essel, H.G., Richter, M., Grein, H., Sohlbach, H., Spreng, W.: GOOSY manuals, GSI 1988 (unpublished)
Göringer, H., Gralla, S., Malzacher, P., Richter, M., Schall, D., Winkelmann, K.: GSI-report 88-16 (1988)
Westmeier, W., Merklin, A.: Catalog of alpha particles from radioactive decay, Physik Daten Nr. 29–1 (1985)
Borcea, C., Gierlik, E., Kalpakchieva, R., Oganessian, Yu.Ts., Penionzhkevich, Yu.: Nucl. Phys. A351, 312 (1981)
Hornshoj, P., Hansen, P.G., Jonson, B.: Nucl. Phys. A230, 380 (1974)
Ewart, A., Kaplan, M.: Phys. Rev.162, 1, 944 (1967)
Gomez del Campo, J., Stokstad, R.G., Biggerstaff, J.A., Dayras, R.A., Snell, A.H., Stelson, P.H.: Phys. Rev. C19, 6, 2170 (1979)
Faust, W., Münzenberg, G., Hofmann, S., Reisdorf, W., Schmidt, K.-H., Armbruster, P., Güttner, K.: Nucl. Instrum. Methods166, 397 (1979)
Bolton, C., Schier, W.A., Tsoupas, N., Enge, H., Salomaa, M., Sperduto, A., Graue, A.: Phys. Rev. C18, 1, 293 (1978)
Morgenstern, H., Bohne, W., Grabisch, K., Lehr, H., Stöffler, W.: Z. Phys. A — Atoms and Nuclei313, 39 (1983)
Reisdorf, W.: Z. Phys. A — Atoms and Nuclei300, 227 (1981)
Reisdorf, W., Heßberger, F.P., Hildenbrand, K.D., Hofmann, S., Münzenberg, G., Schmidt, K.-H., Schneider, J.R.H., Schneider, W.F.J., Sümmerer, K., Wirth, G., Kratz, J.V., Schlitt, K.: Nucl. Phys. A438, 212 (1985)
Reisdorf, W., Heßberger, F.P., Hildenbrand, K.D., Hofmann, S., Münzenberg, G., Schmidt, K.-H., Schneider, W.F.J., Sümmerer, K., Wirth, G., Kratz, J.V., Schlitt, K., Sahm, C.-C.: Nucl. Phys. A444, 154 (1985)
Vermeulen, D., Clerc, H.-G., Sahm, C.-C., Schmidt, K.-H., Keller, J.G., Münzenberg, G., Reisdorf, W.: Z. Phys. A — Atoms and Nuclei318, 157 (1984)
Cohen, S., Plasil, F., Swiatecki, W.J.: Ann. Phys.82, 557 (1974)
Alexander, J.M., Guerreau, D., Vaz, L.C.: Z. Phys. A — Atoms and Nuclei305, 313 (1982)
Author information
Authors and Affiliations
Additional information
One of us (U.S.) acknowledges the hospitality of GSI during her stay in the course of the GSI students programme.
Rights and permissions
About this article
Cite this article
Heßberger, F.P., Ninov, V. & Spoerel, U. Investigation of the velocity distribution of evaporation residues produced in20Ne+197Au reactions atE/A=5.7–11.4 MeV/u. Z. Physik A - Hadrons and Nuclei 340, 171–179 (1991). https://doi.org/10.1007/BF01303829
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01303829