Fission decay of 48Cr at E*CN≈60 MeV

K. A. Farrar, S. J. Sanders, A. K. Dummer, A. T. Hasan, F. W. Prosser, B. B. Back, I. G. Bearden, R. R. Betts, M. P. Carpenter, B. Crowell, M. Freer, D. J. Henderson, R. V.F. Janssens, T. L. Khoo, T. Lauritsen, Y. Liang, D. Nisius, A. H. Wuosmaa, C. Beck, R. M. FreemanSl Cavallaro, A. Szanto De Toledo

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27 Scopus citations


The fully energy-damped yields for the 36Ar + 12C and 20Ne + 28Si reactions at Ec.m. = 47.0 MeV and 45.5 MeV, respectively, are explored using particle-particle-γ coincidence data. These reactions reach a similar excitation energy of E*CN= 59.5 MeV in the 48Cr compound nucleus as was obtained in an earlier particle-particle coincidence study of the 24Mg + 24Mg reaction. The overall mass and total kinetic energy distributions of the fission fragments are found to be well reproduced by statistical-model calculations. These calculations are also found to reproduce structure seen in the excitation-energy spectra for the 20Ne + 28Si and 24Mg + 24Mg exit channels for all three reactions. In previous excitation-function measurements, strong heavy-ion resonance behavior has been observed in elastic and inelastic cross sections for the 24Mg - 24Mg system. There has been speculation that peaks observed in the corresponding excitation-energy spectra at more negative Q values may also be a consequence of this resonance phenomenon. The observation of very similar behavior with the asymmetric-mass entrance channels makes it less likely, though, that the peaks arise from any special configuration of the compound system. Instead, an analysis of the γ-ray data and the results of statistical-model calculations support the conclusion that most of the observed high-lying structure can be accounted for in terms of statistical fission from a fully energy- and shape-equilibrated compound nucleus. For the 24Mg + 24Mg entrance channel, however, comparisons with the statistical model indicate a reduction of high-angular-momentum partial cross sections, leading to the 24Mg + 24Mg fission channel. For the first time, we are able to deduce the nature of the competition between the resonance and statistical-fission mechanisms in this mass region.

Original languageEnglish (US)
Pages (from-to)1249-1261
Number of pages13
JournalPhysical Review C - Nuclear Physics
Issue number3
StatePublished - Sep 1996
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Farrar, K. A., Sanders, S. J., Dummer, A. K., Hasan, A. T., Prosser, F. W., Back, B. B., Bearden, I. G., Betts, R. R., Carpenter, M. P., Crowell, B., Freer, M., Henderson, D. J., Janssens, R. V. F., Khoo, T. L., Lauritsen, T., Liang, Y., Nisius, D., Wuosmaa, A. H., Beck, C., ... Szanto De Toledo, A. (1996). Fission decay of 48Cr at E*CN≈60 MeV. Physical Review C - Nuclear Physics, 54(3), 1249-1261.