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Data: 24-feb-2017
Autori: Pagano, Emanuele Vincenzo
Titolo: Space-time correlations of intermediate mass fragments emitted in Heavy ion reactions at Fermi energy by intensity interferometry studied with CHIMERA and perspectives
Abstract: In Heavy Ion Collisions (HIC) at Fermi energies (E/A between 10 MeV/nucleon and 100 MeV/nucleon) hot nuclear systems are produced and they may disassemble by a variety of dynamical and statistical mechanisms with vastly different time scales (neck emission, fission, multifragmentation, fusion-evaporation, ecc.). The study of the Space-Time properties of the emission pattern of the particles produced in the reactions represents one the most challenge topics of the modern investigation in nuclear physics. For this reason special geometrically flexible particle-particle correlation arrays are powerful tools to be used in coincidence mode with a 4pi detectors. Sensitivity to both space-time and spectroscopic properties of nuclear systems produced in HIC needs accurate measurements of both high angular and energy resolution over a large solid angle coverage. One of these arrays is FARCOS, presently under construction at the INFN Sezione di Catania and LNS. The FARCOS (Femtoscope ARray for COrrelations and Spectroscopy) consists of a number of twenty telescopes, each composed by two Double Sided Silicon Strip Detectors (DSSSD), of thickness 300 micron and 1500 micron, respectively, followed by four CsI(Tl) crystals of 6 cm of thickness read-out by silicon photodiodes. In this PhD thesis a report of the experimental characteristics of the FARCOS array is presented. In particular, tests with alpha sources and on-beams measurements coming from the recent experiment INKIISSY are discussed. A basic study of the particle-particle correlation function is also an important step of this large experimental effort in order to characterize the time scale of the reaction in different experimental configurations. In this work, the space-time sensitivity of the fragment-fragment Correlation Function to the emission of Intermediate Mass Fragments (the IMFs have atomic number between 3 and 25) has been investigated. In particular, IMF-IMF correlation function methods have been applied to 124Sn+64Ni at E/A= 35 MeV reverse kinematics reactions for the physics case of dynamical and statistical fission processes. The IMF-IMF correlation function shows good sensitivity in order to disentangle between dynamical and statistical processes. Some comparisons between data and theoretical simulations, are also discussed.
InArea 02 - Scienze fisiche

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