Abstract
Dynamical breakup of projectile-like fragments (PLF) following dissipative reactions of 48 Ca projectiles with 112 Sn and 124 Sn is shown to exhibit “isoscaling” regularities that can be understood in terms of phase space governed by ground state masses. Ambiguities in isoscaling parameters obscure information on nuclear symmetry energy at subnormal densities.
Highlights
The CECIL collaboration has studied multi-particle correlations in 48Ca+112Sn and 48Ca+124Sn reactions at E/A = 45 MeV using the CHIMERA array [1]
The above inconsistencies are attributed to dynamical breakup of the projectile-like fragments (PLF) following dissipative interactions, instead of statistical decay assumed in the CLAT /GEM IN I simulations
The PLF breakup mechanism is not predicted by microscopic QM D simulations [12], either, but is supported by several pieces of experimental evidence: Neither heavy nor light PLF remnants exhibit random Galilei invariant cross section patterns expected for statistical decay but show strong forward/backward asymmetries of both breakup cross section and mass asymmetry, as well as large relative velocities of the PLF breakup fragments [9]
Summary
The CECIL collaboration has studied multi-particle correlations in 48Ca+112Sn and 48Ca+124Sn reactions at E/A = 45 MeV using the CHIMERA array [1]. Experimental objective was to explore regularities in the isotopic distributions of products emitted following dissipative interactions [2] of (48Ca) with targets of different A/Z, in relation to the nuclear symmetry energy [3, 4] at subnormal matter densities that could be accessible [5,6]. Attention was paid to the possible contribution of non-equilibrium effects [7] and the degree of equilibration reached by the systems. Earlier work [8] had demonstrated the role of pre-equilibrium emission altering nuclear identities and limiting excitation
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