Cluster correlation effects in12C+12C and14N+10B fusion-evaporation reactions

The decay of highly excited states of 24 Mg is studied in fusion evaporation
events completely detected in charge in the reactions 12 C+12 C
and 14 N+10 B 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 24 Mg CN is suggested by the comparison
between the measured and calculated branching ratios for the channels
involving α particles.