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

被引:26
|
作者
Isayev, A. A. [1 ,2 ]
Yang, J. [3 ,4 ]
机构
[1] Kharkov Phys & Technol Inst, UA-61108 Kharkov, Ukraine
[2] Kharkov Natl Univ, UA-61077 Kharkov, Ukraine
[3] Ewha Womans Univ, Dept Phys, Seoul 120750, South Korea
[4] Ewha Womans Univ, Inst Early Univ, Seoul 120750, South Korea
来源
PHYSICAL REVIEW C | 2009年 / 80卷 / 06期
关键词
NUCLEAR-MATTER; X-RAY; SUSCEPTIBILITY; FERROMAGNETISM; SUPERFLUIDITY; ENERGY; STARS;
D O I
10.1103/PhysRevC.80.065801
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
Spin-polarized states in neutron matter in strong magnetic fields up to 10(18) G are considered in the model with the Skyrme effective interaction. By analyzing the self-consistent equations at zero temperature, it is shown that a thermodynamically stable branch of solutions for the spin-polarization parameter as a function of density corresponds to the negative spin polarization when the majority of neutron spins are oriented opposite to the direction of the magnetic field. Besides, beginning from some threshold density dependent on magnetic field strength, the self-consistent equations also have two other branches of solutions for the spin-polarization parameter with the positive spin polarization. The free energy corresponding to one of these branches turns out to be very close to that of the thermodynamically preferable branch. As a consequence, in a strong magnetic field, the state with the positive spin polarization can be realized as a metastable state in the high-density region in neutron matter, which, under decreasing density, at some threshold density changes to a thermodynamically stable state with the negative spin polarization.
引用
收藏
页数:7
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