Constraining nucleon effective masses with flow and stopping observables from the S$\pi$RIT experiment

Abstract

Properties of the nuclear equation of state (EoS) can be probed by measuring the dynamical properties of nucleus-nucleus collisions. In this study, we present the directed flow ($v_1$), elliptic flow ($v_2$) and stopping (VarXZ) measured in fixed target Sn + Sn collisions at 270 AMeV with the S$\pi$RIT Time Projection Chamber. We perform Bayesian analyses in which EoS parameters are varied simultaneously within the Improved Quantum Molecular Dynamics-Skyrme (ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The varied parameters include symmetry energy, $S_0$, and slope of the symmetry energy, $L$, at saturation density, isoscalar effective mass, $m_s^{\ast }/m_N$, isovector effective mass, $m_v^{\ast }/m_N$ and the in-medium cross-section enhancement factor $\eta$. We find that the flow and VarXZ observables are sensitive to the splitting of proton and neutron effective masses and the in-medium cross-section. Comparisons of ImQMD-Sky predictions to the S$\pi$RIT data suggest a narrow range of preferred values for $m_s^{\ast }/m_N$, $m_v^{\ast }/m_N$ and $\eta$.

References in corpus (38)

• Determination of the Equation of State of Dense Matter
• Constraints on the density dependence of the symmetry energy
• Skyrme Interaction and Nuclear Matter Constraints
• Accurate Determination of the Neutron Skin Thickness of ${}^{208}$Pb through Parity-Violation in Electron Scattering
• Implications of PREX-II on the equation of state of neutron-rich matter
• Nuclear energy density optimization: Large deformations
• The equation of state for dense nucleonic matter from a metamodeling. I. Foundational aspects
• Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density
• Determination of the parameters of a Skyrme type effective interaction using the simulated annealing approach
• Symmetry energy from elliptic flow in 197Au + 197Au
• Higher-order effects on the incompressibility of isospin asymmetric nuclear matter
• Nucleon Effective Masses in Neutron-Rich Matter
• Systematics of central heavy ion collisions in the 1A GeV regime
• Constraining the nuclear matter equation of state around twice saturation density
• Probing the Symmetry Energy with the Spectral Pion Ratio
• Constraints on the Skyrme Equations of State from Properties of Doubly Magic Nuclei
• Constraining the neutron-proton effective mass splitting in neutron-rich matter
• Dynamics of clusters and fragments in heavy-ion collisions
• Electric Dipole Polarizability in ${}^{208}$Pb as a Probe of the Symmetry Energy and Neutron Matter around ${\rho }_0/3$
• Constraints on symmetry energy and nucleon effective mass splitting with Heavy Ion Collisions
• Constraining the symmetry energy with heavy-ion collisions and Bayesian analyses
• Symmetry Energy III: Isovector Skins
• Constraints on the symmetry energy and its associated parameters from nuclei to neutron stars
• Decoding the Density Dependence of the Nuclear Symmetry Energy
• S$\pi$RIT: A time-projection chamber for symmetry-energy studies
• Transport approaches for the Description of Intermediate-Energy Heavy-Ion Collisions
• Symmetry energy investigation with pion production from Sn+Sn systems
• Feasability of constraining the curvature parameter of the symmetry energy using elliptic flow data
• Azimuthal dependence of collective expansion for symmetric heavy ion collisions
• Nuclear stopping and flow in heavy ion collisions and the in-medium NN cross section
• Differential directed flow in Au+Au collisions
• Covariance Analysis of Symmetry Energy Observables from Heavy Ion Collision
• Accessing the in-medium effects on nucleon-nucleon elastic cross section with collective flows and nuclear stopping
• Flow angle from intermediate mass fragment measurements
• Studies of the equation-of-state of nuclear matter by heavy-ion collisions at intermediate energy in the multi-messenger era
• The S$\pi$RIT Time Projection Chamber
• Isoscaling in central Sn+Sn collisions at 270 MeV/u
• Charged particle track reconstruction with S$\pi$RIT Time Projection Chamber

Cited by in corpus (5)

• Evolutions of in-medium baryon-baryon scattering cross sections and stiffness of dense nuclear matter from Bayesian analyses of FOPI proton flow excitation functions
• Strongly interacting matter in extreme magnetic fields
• Constraining neutron-proton effective mass splitting through nuclear giant dipole resonance within transport approach
• Phase-space excluded-volume approach for light clusters in nuclear medium
• In-medium effects of nucleon-nucleon cross sections in heavy-ion collisions