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- W2463505947 abstract "The fully energy-damped yields for the $^{36}mathrm{Ar}$ + $^{12}mathrm{C}$ and $^{20}mathrm{Ne}$ + $^{28}mathrm{Si}$ reactions at ${mathit{E}}_{mathrm{c}.mathrm{m}.}$=47.0 MeV and 45.5 MeV, respectively, are explored using particle-particle-ensuremath{gamma} coincidence data. These reactions reach a similar excitation energy of ${mathit{E}}_{mathrm{CN}}^{mathrm{*}}$=59.5 MeV in the $^{48}mathrm{Cr}$ compound nucleus as was obtained in an earlier particle-particle coincidence study of the $^{24}mathrm{Mg}$ + $^{24}mathrm{Mg}$ 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 $^{20}mathrm{Ne}$ + $^{28}mathrm{Si}$ and $^{24}mathrm{Mg}$ + $^{24}mathrm{Mg}$ 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 $^{24}mathrm{Mg}$ + $^{24}mathrm{Mg}$ 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 ensuremath{gamma}-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 $^{24}mathrm{Mg}$ + $^{24}mathrm{Mg}$ entrance channel, however, comparisons with the statistical model indicate a reduction of high-angular-momentum partial cross sections, leading to the $^{24}mathrm{Mg}$ + $^{24}mathrm{Mg}$ 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. textcopyright{} 1996 The American Physical Society." @default.
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- W2463505947 date "1996-09-01" @default.
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- W2463505947 title "Fission decay ofCr48atECN*≊60 MeV" @default.
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- W2463505947 doi "https://doi.org/10.1103/physrevc.54.1249" @default.
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