Cluster correlation effects in $^{12}C$+$^{12}C$ and $^{14}N$+$^{10}B$ fusion-evaporation reactions
Résumé
The decay of highly excited states of 24Mg is studied in fusion evaporation
events completely detected in charge in the reactions 12C+12C
and 14N+10B at 95 and 80 MeV incident energy respectively. The
comparison of light charged particles measured spectra with statistical
model predictions suggests that the dominant reaction mechanism is
compound nucleus (CN) formation and decay. However, in both reactions,
a discrepancy with statistical expectations is found for α particles
detected in coincidence with Carbon, Oxigen and Neon residues.
The comparison between the two reactions shows that this discrepancy
is only partly explained by an entrance channel effect. Evidence for
cluster correlations in excited 24Mg CN is suggested by the comparison
between the measured and calculated branching ratios for the channels
involving α particles.
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