Nuclear neck-density determination at Fermi energy with CHIMERA detector

NArCoS: The new hodoscope for neutrons and charged particles

“…Starting from the design of a prototype, as described below, and after its full qualification and the demonstration of feasibility, the final goal is to build a neutron and LCP hodoscope with high angular (approximately 1 °for neutrons and 0.1 for LCP), energy resolution (<10% for neutrons and approximately 1% for LCP), high granularity, and reasonable neutron detection efficiency (larger than 50%). We plan to use this new device mainly in the Fermi energy domain, where a transition in the reaction mechanisms has been observed [2]. After the testing and simulation phase, mainly done during a master's degree at the Università di Catania and INFN-LNS [26,27], the accepted idea is the construction of an array of EJ276G scintillators [28] as the basic elementary cubic cell of 3 cm in size.…”

“…Frontiers in Physics frontiersin.org a stand-alone configuration or coupled with other detection systems, characterizing the collision pattern (the centrality of the collision), for example, the CHIMERA detector [2] at INFN-LNS in Catania. As neutrons are seen as protons from the plastic scintillator (proton-recoil technique), a veto detector is planned to be placed between the target and NArCoS to disentangle a primary proton from a neutron.…”

“…In particular, thanks to the new facilities for radioactive ion beams (RIBs) that will be available in the future, it will be possible to reach large isospin asymmetry (beam) never obtained until now. Particle-particle correlations are a relevant technique to pin down this kind of information [1][2][3][4][5][6]. By using light-charged particle (LCP) correlations, many works have been conducted from theoretical and experimental perspectives in nuclear dynamics and nuclear structure studies with correlators of first [7,8] and second generations, such as FARCOS [9][10][11][12][13][14].…”

“…By using light-charged particle (LCP) correlations, many works have been conducted from theoretical and experimental perspectives in nuclear dynamics and nuclear structure studies with correlators of first [7,8] and second generations, such as FARCOS [9][10][11][12][13][14]. Such correlation studies have also been explored for heavier charged particles, such as the intermediate mass fragments (IMFs), with an atomic number in the range 3 ≤ Z ≤ 25 [2,15], abundantly produced in heavy ion reactions.…”

Characteristic time scale of cluster production at the Fermi energy

“…Complementary experimental methods to define the time scale of the first phase of IMF production could be obtained by particle-particle (intensity interferometry methods) correlation (including uncharged particles) function (27). The stochastic mean-field (SMF) transport model (19, 28, 29) followed by sequential evaporation allows to accurately constrain the asymmetry term of the nuclear equation of state (NEOS) for the dynamical production of the light IMFs (30,31). For the light IMF production in neck fragmentation, also a clear tendency of migration of neutrons against protons from high-density regions (PLF and TLF) toward the low-density neck region and consequent neutron enrichment of IMFs emitted by the neck has been evidenced, in favor of an asy-stiff symmetry energy behavior (30).…”