Influence of fast emissions and statistical de-excitation on the isospin transport ratio

Abstract

Isospin transport ratio is a powerful method to estimate the neutron-proton (n-p) equilibration in heavy-ion collisions, and extensively used to obtain information on the asy-stiffness of the nuclear Equation of State. In fact such a ratio is expected to bypass any perturbations introducing a linear transformation of the chosen observable. In particular, it is supposed to overcome contributions due to emission, either of dynamical or statistical nature, from the primary fragments formed during the collisions. In this paper we explore the validity of this assumption, looking at the quasi-projectile n-p ratio ($N/Z$) in peripheral and semi-peripheral events for Ca+Ca reactions at 35\amev{}, simulated via the Antisymmetrized Molecular Dynamics transport model, coupled to different statistical decay codes. The statistical de-excitation of the primary fragments introduces a linear transformation at relatively high excitation energies (above 2\amev{}) when the residue approaches the Evaporation Attractor Line, while some effect is produced at lower excitation energies due to the occurrence of some non-linearities. As for fast emissions after the end of the projectile-target interaction it is shown that they introduce a non-linear transformation too.

References in corpus (23)

• Reaction Dynamics with Exotic Beams
• Constraints on the density dependence of the symmetry energy
• The equation of state for dense nucleonic matter from a metamodeling. I. Foundational aspects
• A systematic description of evaporation spectra for light and heavy compound nuclei
• Antisymmetrized molecular dynamics with quantum branching processes for collisions of heavy nuclei
• Isospin-tracing: A probe of non-equilibrium in central heavy-ion collisions
• Antisymmetrized molecular dynamics of wave packets with stochastic incorporation of Vlasov equation
• Dynamics of clusters and fragments in heavy-ion collisions
• Isospin Diffusion and Equilibration for Sn+Sn collisions at E/A=35 MeV
• Correlations between emission timescale of fragments and isospin dynamics in ${}^{124}$Sn+${}^{64}$Ni and ${}^{112}$Sn+${}^{58}$Ni reactions at 35 AMeV
• Influence of Transport Variables on Isospin Transport Ratios
• Isospin Transport at Fermi Energies
• In-medium effects for nuclear matter in the Fermi energy domain
• Isospin Diffusion Observables in heavy ion reactions
• Probing neutron-proton dynamics by pions
• The FAZIA setup: a review on the electronics and the mechanical mounting
• Statistical properties of antisymmetrized molecular dynamics for non-nucleon-emission and nucleon-emission processes
• Relevance of equilibrium in multifragmentation
• Dynamical fission of the quasiprojectile and isospin equilibration for the system 80Kr+ 48 Ca at 35 MeV/nucleon
• Improvement of the nucleon emission process and the statistical property in molecular dynamics
• Probing the nuclear equation of state in heavy-ion collisions at Fermi energy in isospin-sensitive exclusive experiments
• Comparison of AMD calculations with experimental data for peripheral collisions of 93Nb+93Nb,116Sn at 38 MeV/nucleon
• Experimental study of precisely selected evaporation chains in the decay of excited ${}^{25}$Mg

Cited by in corpus (7)

• Isospin diffusion measurement from the direct detection of a Quasi-Projectile remnant
• First results from the INDRA-FAZIA apparatus on isospin diffusion in ${}^{58,64}$Ni+${}^{58,64}$Ni systems at Fermi energies
• Examination of cluster production in excited light systems at Fermi energies from new experimental data and comparison with transport model calculations
• Experimental study of the isospin transport with 40,48 Ca+ 40,48 Ca reactions at 35 MeV/nucleon
• Experimental study of the ${}^{40,48}$Ca+ ${}^{40,48}$Ca reactions at 35 MeV/nucleon
• Isospin diffusion from ${}^{40,48}$Ca${+}^{40,48}$Ca experimental data at Fermi energies: Direct comparisons with transport model calculations
• Study of quasi-projectile properties at Fermi energies in 48Ca projectile systems