Speaker
Description
We present a study of the reaction dynamics of semiperipheral 58Ni+58Ni collisions at 32, 52, and 74 MeV/nucelon through the reconstruction of primary sources and the study of their evolution with centrality and beam energy. The analysis exploits the capabilities of the INDRA–FAZIA apparatus, which combines large angular coverage with excellent isotopic resolution.
After efficiency corrections, evaporative and midvelocity emissions are disentangled, allowing the determination of the size and excitation energy of the primary sources, namely the excited quasi-projectile and the neck. For the first time, this reconstruction is consistently extended to the breakup channel, enabling a direct comparison with the binary one. The results, consistent in both reaction channels, indicate an increasing contribution of midvelocity emission with centrality and beam energy, while its energy density remains nearly constant at about 15–20 MeV/nucleon, significantly higher than that of the primary QP, which remains below 3 MeV/nucleon.
Moreover, the neutron-to-proton ratios of the evaporative and midvelocity components are compared, confirming the neutron enrichment of the neck region and providing insight into the isospin drift as a function of beam energy.