Magnetization of a neutron plasma with Skyrme and Gogny forces in the presence of a strong magnetic field
- Department of Fundamental Physics and Instituto Universitario de Fisica Fundamental y Matematicas University of Salamanca, Plaza de la Merced s/n, 37008, Salamanca (Spain)
Some thermodynamical magnitudes of interest in a pure neutron plasma are studied within the framework of the nonrelativistic Hartree-Fock approximation at finite density and temperature. We use Skyrme and Gogny forces to describe such a neutron plasma and study the main differences that arise in these two effective parametrizations of the nuclear interaction when a strong magnetic field induces a permanent magnetization in the gas. The existence of a nonzero permanent spin polarization in a neutron plasma is explored in the density-temperature parameter space. We find that for moderate temperatures and in the low-density range up to densities {approx_equal}0.5{rho}{sub 0} both parametrizations predict that as density decreases an increasingly strong magnetization is allowed. In the range 0.5{rho}{sub 0} < or. approx. {rho} < or approx. 3{rho}{sub 0} there is an approximately constant polarization that can be as big as {approx_equal}12% for the maximum allowed interior magnetic field B{approx_equal}10{sup 18} G. For higher densities there is a dramatic difference in the polarization trend followed by Skyrme an Gogny forces. Although the former predict a ferromagnetic phase transition, the Gogny forces prevent it keeping the magnetization below 5%.
- OSTI ID:
- 21191993
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 77, Issue 6; Other Information: DOI: 10.1103/PhysRevC.77.065806; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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