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arXiv 1504.04537astro-ph.HEnucl-th
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吸积和非吸积中子星壳的中子滴跃迁

Neutron drip transition in accreting and nonaccreting neutron star crusts

N. Chamel, A. F. Fantina, J. L. Zdunik, P. Haensel

摘要:

构成中子星内部的致密物质中的中子滴跃迁一般指的是当物质密度达到某个阈值密度$ρ_\textrm{drip}$时出现的未束缚中子。这种转变主要是在冷催化物质假说下研究的。然而,这种假设对于吸积中子星是不现实的。在研究了吸积和非吸积中子星中允许的物理过程后,导出了中子滴产生的条件,并得到了中子滴密度和压力的一般解析表达式。此外,我们表明,中子滴过渡发生在较低的密度和压力比平均核近似内预测。这种转变的数值研究不同的初始成分的灰烬从X射线爆发和超爆发使用微观核质量模型。

英文摘要:

The neutron-drip transition in the dense matter constituting the interior of neutron stars generally refers to the appearance of unbound neutrons as the matter density reaches some threshold density $ρ_\textrm{drip}$. This transition has been mainly studied under the cold catalyzed matter hypothesis. However, this assumption is unrealistic for accreting neutron stars. After examining the physical processes that are thought to be allowed in both accreting and nonaccreting neutron stars, suitable conditions for the onset of neutron drip are derived and general analytical expressions for the neutron drip density and pressure are obtained. Moreover, we show that the neutron-drip transition occurs at lower density and pressure than those predicted within the mean-nucleus approximation. This transition is studied numerically for various initial composition of the ashes from X-ray bursts and superbursts using microscopic nuclear mass models.

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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