Statistical against dynamical PLF fission as seen by the IMF-IMF correlation functions and comparisons with CoMD model

Abstract

Abstract. In nuclear reactions at Fermi energies two and multi particles intensity interferometry correlation methods are powerful tools in order to pin down the characteristic time scale of the emission processes. In this paper we summarize an improved application of the fragment-fragment correlation function in the specific physics case of heavy projectile-like (PLF) binary massive splitting in two fragments of intermediate mass (IMF). Results are shown for the reverse kinematics reaction 124 Sn+ 64 N i at 35 AMeV that has been investigated by using the forward part of CHIMERA multi-detector. The analysis was performed as a function of the charge asymmetry of the observed couples of IMF. We show a coexistence of dynamical and statistical components as a function of the charge asymmetry. Transport CoMD simulations are compared with the data in order to pin down the timescale of the fragments production and the relevant ingredients of the in medium effective interaction used in the transport calculations.

NArCoS: The new hodoscope for neutrons and charged particles

“…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.…”

“…Correlation techniques have been employed in the field of gamma-particle coincident emission for spectroscopy and reaction studies [16,17]. In contrast, few investigations have been performed, including neutrons, particularly n-n, n-p, and n-IMF correlations [15,18,19]. In two-(or multiple-) particle correlation studies, it is crucial to preserve a good resolution of the relative linear momentum (in both intensity and detection angle) to extract experimental results as accurately as possible [20][21][22].…”

Some Results for the Study of the Efficiency and Cross-Talk Probability by Using Geant4 Simulations for the Neutron Correlator Narcos

“…The measurement of particle-particle relative energy correlation is a crucial method to access the dynamics in the early stages of the collision (20-100 fm/c), which has been adopted since the beginning of heavy ion physics to distinguish between prompt (<100 fm/c) and sequential reactions (<1000 fm/c) [1][2][3][4][5][6]. The light charged particle (LCP) correlations and the correlations of heavier particles as the Intermediate Mass Fragments (IMF), whose typical atomic number are in the range 2 < Z < 25, have been widely studied in many works, both from the experimental and theoretical sides [5,7,8]. On the contrary, only a few investigations have been reported at including uncharged particles in the main trigger, in particular for n-n, n-p, and n-IMF correlations [8,9,10].…”

“…The light charged particle (LCP) correlations and the correlations of heavier particles as the Intermediate Mass Fragments (IMF), whose typical atomic number are in the range 2 < Z < 25, have been widely studied in many works, both from the experimental and theoretical sides [5,7,8]. On the contrary, only a few investigations have been reported at including uncharged particles in the main trigger, in particular for n-n, n-p, and n-IMF correlations [8,9,10]. In order to extract sufficiently accurate experimental information, a good resolution of the relative linear momentum (both in intensity and in the detection angle) represents a key aspect to consider in the study of particle-particle correlations [11,12,13].…”