Clustering effects in fusion evaporation reactions with light even-even N=Z nuclei. the24Mg and28Si cases

In the recent years, cluster structures have been evidenced in many ground and excited
states of light nuclei [1, 2]. 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, and compared to the results of a pure
statistical model [3, 4].
Inclusive variables are in general well reproduced by the model. We found clear deviations
from the statistical model if we select emission channels involving multiple α
particles which are more probable than expected from a purely statistical behavior. Data
from 12C+12C reaction have been analyzed in order to study the decay of the Hoyle state
of 12C* with two different selections: peripheral binary collisions and 6α decay channel
in central events. To continue the investigation on light systems, we have recently measured
the 16O+12C reaction at three different beam energies, namely Ebeam = 90, 110 and
130 MeV. Preliminary results are presented.