Delineating effects of tensor force on the density dependence of nuclear symmetry energy

Abstract

In this talk, we report results of our recent studies to delineate effects of the tensor force on the density dependence of nuclear symmetry energy within phenomenological models. The tensor force active in the isosinglet neutron-proton interaction channel leads to appreciable depletion/population of nucleons below/above the Fermi surface in the single-nucleon momentum distribution in cold symmetric nuclear matter (SNM). We found that as a consequence of the high momentum tail in SNM the kinetic part of the symmetry energy $E_{sym}^{kin}(\rho )$ is significantly below the well-known Fermi gas model prediction of approximately $12.5(\rho /{\rho }_0{)}^{2/3}$. With about 15% nucleons in the high momentum tail as indicated by the recent experiments at J-Lab by the CLAS Collaboration, the $E_{sym}^{kin}(\rho )$ is negligibly small. It even becomes negative when more nucleons are in the high momentum tail in SNM. These features have recently been confirmed by three independent studies based on the state-of-the-art microscopic nuclear many-body theories. In addition, we also estimate the second-order tensor force contribution to the potential part of the symmetry energy. Implications of these findings in extracting information about nuclear symmetry energy from nuclear reactions are discussed briefly.

Talk given by Chang Xu at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)

References in corpus (15)

• Skyrme Interaction and Nuclear Matter Constraints
• Nuclear symmetry energy probed by neutron skin thickness of nuclei
• Probing Cold Dense Nuclear Matter
• Evidence for the Strong Dominance of Proton-Neutron Correlations in Nuclei
• Connecting Neutron Star Observations to Three-Body Forces in Neutron Matter and to the Nuclear Symmetry Energy
• Tensor Forces and the Ground-State Structure of Nuclei
• Nuclear symmetry energy and its density slope at normal density extracted from global nucleon optical potentials
• Symmetry energy of dilute warm nuclear matter
• Recent observation of short range nucleon correlations in nuclei and their implications for the structure of nuclei and neutron stars
• Half-Skyrmions, Tensor Forces and Symmetry Energy in Cold Dense Matter
• Density dependence of nuclear symmetry energy constrained by mean-field calculations
• High momentum components in the nuclear symmetry energy
• Tensor Correlations Measured in 3He(e,e'pp)n
• An improved single particle potential for transport model simulations of nuclear reactions induced by rare isotope beams
• Nuclear symmetry energy and neutron skin thickness

Cited by in corpus (17)

• Momentum sharing in imbalanced Fermi systems
• Critical Density and Impact of $\Delta (1232)$ Resonance Formation in Neutron Stars
• Symmetry energy of cold nucleonic matter within a relativistic mean field model encapsulating effects of high momentum nucleons induced by short-range correlations
• Effects of short-range correlation reduced kinetic symmetry energy in heavy-ion collisions at intermediate energies
• Impact of NICER's Radius Measurement of PSR J0740+6620 on Nuclear Symmetry Energy at Suprasaturation Densities
• The isospin quartic term in the kinetic energy of neutron-rich nucleonic matter
• Probing the high-density behavior of symmetry energy with gravitational waves
• Nuclear fourth-order symmetry energy and its effects on neutron star properties in the relativistic Hartree-Fock theory
• Short range correlations in the extended quantum molecular dynamics model
• Investigating Effects of Relativistic Kinematics, Dimensionality, Interactions, and Short-Range Correlations on the Ratio of Quartic over Quadratic Nuclear Symmetry Energies
• Relativistic self-energy decomposition of nuclear symmetry energy and equation of state of neutron matter within QCD sum rules
• Short-range correlations and momentum distributions in mirror nuclei 3H and 3He
• Precise Measurement of Short-Range Correlations in Nuclei from Bremsstrahlung Gamma Ray Emission in Low-Energy Heavy-Ion Collisions
• Effects of Neutron-Proton Short-Range Correlation on the Equation of State of Dense Neutron-Rich Nucleonic Matter
• Origins and Impacts of High-Density Symmetry Energy
• Finite particle-number description of symmetric nuclear matter with spin excitations of high-momentum pairs induced by tensor force
• Experimental Study of Bremsstrahlung Gamma Ray Emission and Short-Range Correlations in ${}^{124}$Sn+${}^{124}$Sn Collisions at 25 MeV/u