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arXiv 0904.3261nucl-th
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强磁场下$δ$介子对核物质不稳定性的影响

Effect of the $δ$-meson on the instabilities of nuclear matter under strong magnetic fields

A. Rabhi, C. Providencia, J. Da Providencia

摘要:

研究了等矢量标量介子对强磁场下非对称非均匀核物质中旋节不稳定性和蒸馏效应的影响。考虑了具有常数耦合和密度依赖参数的相对论核模型。强磁场可以对不稳定区域产生大的影响,从而产生不稳定带和更宽的不稳定区域。结果表明,对于富中子物质,$δ$介子的加入增加了NLW模型的不稳定区域的大小,而减少了DDRH模型的不稳定区域的大小。讨论了$δ$介子对向均匀$β$平衡物质跃迁密度的影响。DDRH $δ$模型预测最小的转变压力,约为NL $δ$获得的值的一半。

英文摘要:

We study the influence of the isovector-scalar meson on the spinodal instabilities and the distillation effect in asymmetric non-homogenous nuclear matter under strong magnetic fields, of the order of $10^{18}-10^{19}$ G. Relativistic nuclear models both with constant couplings (NLW) and with density dependent parameters (DDRH) are considered. A strong magnetic field can have large effects on the instability regions giving rise to bands of instability and wider unstable regions. It is shown that for neutron rich matter the inclusion of the $δ$ meson increases the size of the instability region for NLW models and decreases it for the DDRH models. The effect of the $δ$ meson on the transition density to homogeneous $β$-equilibrium matter is discussed. The DDRH$δ$ model predicts the smallest transition pressures, about half the values obtained for NL$δ$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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