Effective mass splitting of neutron and proton and isospin emission in heavy-ion collisions

Abstract

Within the framework of an isospin and momentum dependent transport model, the emissions of isospin particles (nucleons and light clusters) squeezed out in heavy-ion collisions are investigated as probes of the poorly known symmetry energy at high baryon density. Two different mass splittings of neutrons and protons in nuclear medium as $m_n^{\ast }>m_p^{\ast }$ and $m_n^{\ast }<m_p^{\ast }$ are used in the model and their influence on the isospin emission in heavy-ion collisions is discussed thoroughly. The competition between the stiffness and the momentum dependence of the symmetry potential on reaction dynamics are compared and systematically analyzed. It is found that the difference of the neutron and proton directed flows and the transverse momentum distribution of the neutron/proton ratio are sensitive to the stiffness of the symmetry energy, which can not be changed with the controversial effective mass splitting. The elliptic flows of free nucleons at high transverse momentum within mid-rapidity emission are a promising observable as distinguishing the nucleon effective mass splitting.

16 pages, 7 figures

References in corpus (14)

• Symmetry energy from elliptic flow in 197Au + 197Au
• Systematics of pion emission in heavy ion collisions in the 1A GeV regime
• Systematics of central heavy ion collisions in the 1A GeV regime
• Isospin effects on sub-threshold kaon production at intermediate energies
• Isospin emission and flows at high baryon density: a test of the symmetry potential
• Momentum dependence of the symmetry potential and its influence on nuclear reactions
• Nuclear in-medium effects and collective flows in heavy-ion collisions at intermediate energies
• Dynamical analysis on heavy-ion fusion reactions near Coulomb barrier
• Transverse emission of isospin ratios as a probe of high-density symmetry energy in isotopic nuclear reactions
• Constraining the high-density behavior of nuclear equation of state from strangeness production in heavy-ion collisions
• Dynamics of pion production in heavy-ion collisions around 1A GeV energies
• Pion Production in Heavy-ion Collisions in the 1 A GeV region
• Fusion dynamics of symmetric systems near barrier energies
• Dynamics of strangeness production in heavy-ion collisions near threshold energies

Cited by in corpus (31)

• Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density
• Nucleon Effective Masses in Neutron-Rich Matter
• Dense Nuclear Matter Equation of State from Heavy-Ion Collisions
• Neutron-proton effective mass splitting in neutron-rich matter at normal density from analyzing nucleon-nucleus scattering data within an isospin dependent optical model
• Nuclear dynamics and particle production near threshold energies in heavy-ion collisions
• Transport approaches for the Description of Intermediate-Energy Heavy-Ion Collisions
• Constraining simultaneously nuclear symmetry energy and neutron-proton effective mass splitting with nucleus giant resonances from a dynamical approach
• Thermal properties of asymmetric nuclear matter with an improved isospin- and momentum-dependent interaction
• Constraining the high-density nuclear symmetry energy with the transverse-momentum dependent elliptic flow
• Isospin splitting of nucleon effective mass from giant resonances in ${}^{208}$Pb
• Impact of NICER's Radius Measurement of PSR J0740+6620 on Nuclear Symmetry Energy at Suprasaturation Densities
• Covariance Analysis of Symmetry Energy Observables from Heavy Ion Collision
• Dynamics of strangeness and collective flows in heavy-ion collisions near threshold energies
• Revisit of the neutron/proton ratio puzzle in intermediate-energy heavy-ion collisions
• In-medium and isospin effects on particle production near threshold energies in heavy-ion collisions
• Isospin dynamics on neck fragmentation in isotopic nuclear reactions
• Model dependence of isospin sensitive observables at high densities
• Nuclear in-medium and isospin effects on subthreshold kaon production in heavy-ion collisions
• Nuclear fragmentation and charge-exchange reactions induced by pions in the $\Delta$-resonance region
• Particle production in antiproton induced nuclear reactions
• Nuclear in-medium effects on $\eta$ dynamics in proton-nucleus collisions
• Production of fragments and hyperfragments in antiproton-nucleus collisions
• Preequilibrium particle emissions and in-medium effects on the pion production in heavy-ion collisions
• Auxiliary Function Approach for Determining Symmetry Energy at Supra-saturation Densities
• Nucleon Effective E-Mass in Neutron-Rich Matter from the Migdal-Luttinger Jump
• Isospin splitting of nucleon effective mass and symmetry energy in isotopic nuclear reactions
• Light fragment and neutron emission in high-energy proton induced spallation reactions
• Nuclear fragmentation induced by low-energy antiprotons within a microscopic transport approach
• Unexpected neutron/proton ratio and isospin effect in low-energy antiproton induced reactions
• Constraining neutron-proton effective mass splitting through nuclear giant dipole resonance within transport approach
• Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions