Comparison of cross sections for C + O reactions in the second regime of complete fusion |
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Authors: | C. Beck F. Haas R.M. Freeman B. Heusch J.P. Coffin G. Guillaume F. Rami P. Wagner |
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Affiliation: | Centre de Recherches Nucléaires and Université Louis Pasteur, 67037 Strasbourg Cedex, France |
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Abstract: | Kinetic energy spectra, angular distributions, and elemental yield distributions have been measured for the 12 C + 16 O, 12 C + 18 O and 13 C + 17 O reaction products over an energy range from 2 to 7 times the Coulomb barrier energy. A careful kinematic analysis of the evaporation residues and comparisons with statistical-model calculations show that fusion proceeds with full momentum transfer followed by a statistical decay of the compound nucleus. The competition between complete fusion process and peripheral reactions in the 12 C + 16 O system is less important than for the 12 C + 18 O and 13 C + 17 O reactions. The unexpectedly high 12 C + 16 O complete fusion cross sections are related to the possible occurrence of a superdeformation of the 28 Si compound nucleus. |
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Keywords: | Nuclear reactions |
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