Clustering effects in 48Cr composite nuclei produced via 24Mg + 24Mg reaction

We have undertaken at the Tandem accelerator of LNL the study of the 24Mg + 24Mg reaction at the bombarding energy of Elab = 91.7 MeV, corresponding to the resonance J=36+ at Ex = 60 MeV. The light charged particles (LCP) emitted from the compound nucleus de-excitation have been measured with the 8πLP apparatus. Evaporation residues (ER) have been detected with a Parallel Plate Avalanche Counter in the forward direction. ER-LCP and LCP-LCP coincidence events have been collected. The comparison of the data with the predictions of the Statistical Model code (LILITA-N97) is expected to be particularly elucidating for this study. In particular, the α-α angular correlations simulated by the LILITA-N97 code are reported for two sets of the deformation parameters. The first one corresponds to a deformation according Rotating Liquid Drop Model (RLDM) (axis ratio b/a =1.51 for at J = 35 ℎ), the second set of parameters corresponds to an Highly Deformed nucleus (b/a = 2.0 at J = 35 ℎ). with deformed emission barriers taken from systematics. The geometry of 8πLP detectors has been included in the simulations and in figure the correlations are reported as a function of its detector number. This observable is sensitive to the nuclear deformation. A strong sensitivity is also expected for energy spectra and particle multiplicities. Alpha and proton multiplicities predicted by the LILITA-N97 code are reported for the RLDM and Highly Deformed cases. Furthermore, the high efficiency of 8πLP apparatus allows to select particular fusion-evaporation channels, whose fold and LCP-LCP distributions, are predicted to be very sensitive to the nuclear deformation. In particular this selection is possible for the α3p and 2α2p, two of the most intense channels, expected to be weekly affected by the pollution from higher fold channels. In the experiment a good statistics was achieved which will allow us to extract angular correlations, LCP multiplicities and to analyse high fold events. Data analysis is in progress