Roles of isoscalar hyperons in probing the density dependence of the nuclear symmetry energy

Abstract

The role of the isoscalar hyperon Lambda in probing the density dependence of the nuclear symmetry energy is studied in multi-Lambda hypernuclei, hyperon-rich matter and neutron stars in relativistic models. Relationships between the properties of three types of objects and the neutron thickness in 208Pb are established with respect to the isoscalar-isovector coupling that modifies the density dependence of the symmetry energy. The exotic isotopes far from the neutron drip line can be stabilized by filling in considerable Lambda hyperons. The difference of the binding energy of multi-Lambda hypernuclei from different models is attributed to different symmetry energies. The isovector potential together with the neutron thickness in multi-Lambda hypernuclei investigated is very sensitive to the isoscalar-isovector coupling. The large sensitivity of the Lambda hyperon fraction to the isoscalar-isovector coupling occurs at about 2-3 rho_0 in beta equilibrated hyperon-rich matter. In neutron stars with hyperonization, an on-off effect with respect to the isoscalar-isovector coupling exists for the neutron star radius.

arXiv comment13 pages, 5 figures, To appear in Phys. Lett. B

References in corpus (18)

• A New Parameterization for the Lagrangian Density of Relativistic Mean Field Theory
• Isospin Asymmetry in Nuclei and Neutron Stars
• Neutron Star Structure and the Neutron Radius of 208Pb
• Recent Progress in Quantum Hadrodynamics
• Composition and Structure of Protoneutron Stars
• Isospin Physics in Heavy-Ion Collisions at Intermediate Energies
• Low Mass Neutron Stars and the Equation of State of Dense Matter
• Probing the High Density Behaviour of Nuclear Symmetry Energy with High Energy Heavy-Ion Collisions
• The neutron radii of Lead and neutron stars
• Properties of Strange Hadronic Matter in Bulk and in Finite Systems
• Neutron-Proton Differential Flow as a Probe of Isospin-Dependence of Nuclear Equation of State
• Constraining URCA cooling of neutron stars from the neutron radius of 208Pb
• Phase Transition to Hyperon Matter in Neutron Stars
• Constraints on $\Sigma$ Nucleus Dynamics from Dirac Phenomenology of ${\Sigma }^{-}$ Atoms
• Relativistic mean-field study of neutron-rich nuclei
• Effect of symmetry energy on two-nucleon correlation functions in heavy-ion collisions induced by neutron-rich nuclei
• Charge density of light exotic nuclei and $\rho NN$ tensor coupling
• Exploring binding energy and separation energy dependences of HBT strength

Cited by in corpus (8)

• Effects of the density dependence of nuclear symmetry energy on properties of superheavy nuclei
• A relativistic mean field study of multi-strange system
• Equation of state and hybrid star properties with the weakly interacting light U-boson in relativistic models
• Neutron star deformability with hyperonization in density-dependent relativistic mean-field models
• Symmetry energy softening in nuclear matter with non-nucleonic constituents
• Novel halos in light kaonic nuclei as an indicator of nuclear equation of state at supra-normal densities
• $\Lambda -$hyperon interaction with nucleons
• Ground-state properties of light kaonic nuclei signaling symmetry energy at high densities