scholarly journals Spin-polarized states in neutron matter in a strong magnetic field

2009 ◽  
Vol 80 (6) ◽  
Author(s):  
A. A. Isayev ◽  
J. Yang
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Neutron Matter ◽  
Spin Polarized

Triplet superfluidity in neutron matter with Skyrme forces at subnuclear and supranuclear densities in a strong magnetic field

Open Physics ◽  
2011 ◽  
Vol 9 (4) ◽  
Author(s):  
Alexander Tarasov
Keyword(s):  
Magnetic Field ◽  
Phase Transitions ◽  
Strong Magnetic Field ◽  
Critical Density ◽  
Outer Core ◽  
Neutron Matter ◽  
P Wave ◽  
Phase Transition Temperatures ◽  
Pure Neutron Matter ◽  
Analytical Formulae

AbstractWithin a generalized non-relativistic Fermi-liquid approach we have found general analytical formulae for phase-transition temperatures T c,1(n, H) and T c,2(n, H) (which are nonlinear functions of density, n, and linear of magnetic field, H) for phase transitions in spatially uniform, dense, pure neutron matter from normal to superfluid states with spin-triplet p-wave pairing (similar to anisotropic superfluid phases 3He - A1 and 3He - A2) in steady and homogeneous sufficiently strong magnetic field (but |µn|H ≪ E c < ɛ F(n), where µn is the magnetic dipole moment of a neutron, E c is the cutoff energy and ɛ F(n)is the Fermi energy in neutron matter). General formulae for T c,1,2(n,H) are valid for arbitrary parameterization of the effective Skyrme forces in neutron matter. We have used for definiteness the so-called SLy2, Gs and RATP parameterizations of the Skyrme forces with different exponents in their power dependence on density n (at sub- and supranuclear densities) from the interval 0.7 n 0 ≲ n < n c(Skyrme)< 2 n 0, where n 0 =0.17 fm−3 is the nuclear density and n c(Skyrme)is the the critical density of the ferromagnetic instability in superfluid neutron matter. These phase transitions might exist in the liquid outer core of magnetized neutron stars.

A microscopic study of spin-polarized neutron matter

2021 ◽  
pp. 1-11
Author(s):  
M.K. Al-Sugheir ◽  
F.F. Mqbel
Keyword(s):  
Magnetic Field ◽  
Nucleon Nucleon ◽  
Neutron Matter ◽  
Effective Magnetic Field ◽  
Many Body ◽  
Nucleon Potential ◽  
Hartree Fock ◽  
Spin Polarized ◽  
Particle Pressure ◽  
Polarized Neutron

In this work, the static fluctuation approximation (SFA) is used to investigate the thermodynamic properties of spin-polarized neutron matter. The energy per particle, pressure, entropy per particle, specific heat capacity, and effective magnetic field are studied as functions of density, temperature, and polarization fraction. The Argonne v18 nucleon–nucleon potential is used here. It is found that the energy per particle, pressure, entropy per particle, and effective magnetic field increase as the density or temperature increases. Also, the energy per particle and pressure are linearly dependent on the quadratic spin polarization δ2. The system becomes more ordered as δ increases. Our calculations are found to be in good agreement with previously published results obtained with different many-body techniques, such as the lowest order constrained variational (LOCV) method, the Brueckner–Hartree–Fock (BHF) approach, and the Dirac–Brueckner–Hartree–Fock (DBHF) technique.

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