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arXiv 1304.2663nucl-th
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无限大核物质的自旋不稳定性和有效张量相互作用

Spin instabilities of infinite nuclear matter and effective tensor interactions

J. Navarro, A. Polls

摘要:

我们研究了现代有效核子-核子相互作用中存在的张量力对核和中子物质自旋不稳定性的影响。对某些非常低的能量激发模式的系统的稳定性条件表示的朗道参数。结果表明,在自旋的情况下,稳定性条件是等价的条件来自自旋磁化率,这是作为零频率和长波长的限制计算的自旋响应函数的随机相位近似。分析了Skyrme型的零程力和M3 Y、Gogny型的有限程力。结果表明,对于Skyrme力考虑,张量效应是相当大的,并倾向于增加自旋不稳定性,出现在较小的密度比的情况下,张量不考虑在内。相反,对于对称核物质和中子物质的同位旋通道,有限程力张量对自旋磁化率的贡献很小或可以忽略。与现实的相互作用所提供的自旋磁化率的比较。

英文摘要:

We study the effects of the tensor force, present in modern effective nucleon-nucleon interactions, in the spin instability of nuclear and neutron matter. Stability conditions of the system against certain very low energy excitation modes are expressed in terms of Landau parameters. It is shown that in the spin case, the stability conditions are equivalent to the condition derived from the spin susceptibility, which is obtained as the zero-frequency and long-wavelength limit of the spin response function calculated in the Random Phase Approximation. Zero-range forces of the Skyrme type and finite-range forces of M3Y and Gogny type are analyzed. It is shown that for the Skyrme forces considered, the tensor effects are sizeable, and tend to increase the spin instability which appears at smaller densities than in the case that the tensor is not taken into account. On the contrary, the tensor contribution of finite range forces to the spin susceptibility is small or negligible for both isospin channels of symmetric nuclear matter as well as for neutron matter. A comparison with the spin susceptibility provided by realistic interactions is also presented.

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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