Magnetization of a neutron plasma with Skyrme and Gogny forces in the presence of a strong magnetic field - Nuclear TheoryReportar como inadecuado




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Abstract: Some thermodynamical magnitudes of interest in a pure neutron plasma arestudied within the framework of the non-relativistic Brueckner-Hartree-Fockapproximation at finite density and temperature. We use Skyrme and Gogny forcesto describe such a neutron plasma and study the main differences that arise inthese two effective parametrizations of the nuclear interaction when a strongmagnetic field induces a permanent magnetization in the gas. The existence of anon-zero permanent spin polarization in a neutron plasma is explored in thedensity-temperature parameter space. We find that for moderate temperatures andin the low density range up to densities $\approx 0.5 ho 0$ bothparametrizations predict that as density decreases an increasingly strongmagnetization is allowed. In the range $0.5 ho 0 \lesssim ho \lesssim 3 ho 0$ there is an approximately constant polarization that can be as big as$\approx 12%$ for the maximum allowed interior magnetic field $B \approx10^{18}$ G. For higher densities there is a dramatic difference in thepolarization trend followed by Skyrme an Gogny forces. While the former predicta ferromagnetic phase transition, the Gogny forces prevent it keeping themagnetization below 5%.



Autor: M. Angeles Perez-Garcia

Fuente: https://arxiv.org/







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