2013/12/31 by R. Aguirre, R. M. Aguirre, E. Bauer +2 · 15 citations
Chemistry · Physics and Astronomy · #Chemistry #Compressibility #Condensed matter physics #Electron magnetic dipole moment #Equation of state #High-Energy Particle Collisions Research #Magnetic field #Magnetic moment #Magnetization #Mean field theory #Neutron #Neutron magnetic moment #Neutron star #Nuclear matter #Nuclear physics #Nucleon #Physics #Polarization (electrochemistry) #Pulsars and Gravitational Waves Research #Quantum electrodynamics #Quantum mechanics #Quantum, superfluid, helium dynamics #Thermodynamics #astro-ph.SR #nucl-th
paper · pdf · doi:10.1103/physrevc.89.035809
published in Physical Review C 89(3) (American Institute of Physics) · updated to correspond with the published version
openalex publication_date 2014/03/31 · arxiv created 2014/10/14 · arxiv updated 2014/10/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The equation of state of neutron matter is affected by the presence of a magnetic field due to the intrinsic magnetic moment of the neutron. Here we study the equilibrium configuration of this system for a wide range of densities, temperatures, and magnetic fields. Special attention is paid to the behavior of the isothermal compressibility and the magnetic susceptibility. Our calculation is performed using both microscopic and phenomenological approaches of the neutron matter equation of state, namely the Brueckner-Hartree-Fock (BHF) approach using the Argonne V18 nucleon-nucleon potential supplemented with the Urbana IX three-nucleon force, the effective Skyrme model in a Hartree-Fock description, and the quantum hadrodynamic formulation with a mean-field approximation. All these approaches predict a change from completely spin polarized to partially polarized matter that leads to a continuous equation of state. The compressibility and the magnetic susceptibility show characteristic behaviors which reflect that fact. Thermal effects tend to smear out the sharpness found for these quantities at T=0. In most cases a thermal increase of \ensuremathΔT=10 MeV is enough to hide the signals of the change of polarization. The set of densities and magnetic field intensities for which the system changes it spin polarization is different for each model. However, we found that under the conditions examined in this work there is an overall agreement between the three theoretical descriptions.