Fast emissions of light charge particles at onset of pre-equilibrium.

Cicerchia M., Gramegna F. per la Collaborazione NUCLEX

I - Fisica nucleare e subnucleare
Aula Palazzo dell'Emiciclo - Sala B. Croce - Martedì 24 h 09:00 - 12:00
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The pre-equilibrium threshold has been fixed for a long time at 10 MeV/u, but in recent literature, a new hypothesis is formulated: the pre-equilibrium threshold could be lower for reactions in which the beam structure plays an important role. This is the reason for which our collaboration decided to study the four reactions: ${}^{16O}+{}^{30}Si$, ${}^{18}O+{}^{28}Si$, ${}^{19}F+{}^{27}Al$ at 7 MeV/u and ${}^{16}O+{}^{30}Si$ at 8MeV/u. The experiment was carried out using the GARFIELD+RCo array at Legnaro National Laboratories. After a general introduction on the experimental campaign performed on different systems, which have evidenced anomalies in the alpha-particle emission channel, this contribution will focus on the analysis and comparison of the results obtained in the measurement reported above, showing in an exclusive way the observed effects related to the entrance channels. The experimental results will be compared to model predictions, for which the same filtering and complete event selection have been applied.

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