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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >Entrainment coefficient and effective mass for conduction neutrons in neutron star crust: simple microscopic models
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Entrainment coefficient and effective mass for conduction neutrons in neutron star crust: simple microscopic models

机译：中子星壳中传导中子的夹带系数和有效质量：简单的微观模型

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In the inner crust of a neutron star, at densities above the "drip" threshold, unbound "conduction" neutrons can move freely past through the ionic lattice formed by the nuclei. The relative current density n(i) = n(i) of such conduction neutrons will be related to the corresponding mean particle momentum pi by a proportionality relation of the form n(i) = Kp(i) in terms of a physically well defined mobility coefficient K whose value in this context has not been calculated before. Using methods from ordinary solid state and nuclear physics, a simple quantum mechanical treatment based on the independent particle approximation, is used here to formulate K as the phase space integral of the relevant group velocity over the neutron Fermi surface. The result can be described as an "entrainment" that changes the ordinary neutron mass m to a macroscopic effective mass per neutron that will be given-subject to adoption of a convention specifying the precise number density n of the neutrons that are considered to be 'free"-by m(*) = n/K. The numerical evaluation of the mobility coefficient is carried out for nuclear configurations of the "lasagna" and "spaghetti" type that may be relevant at the base of the crust. Extrapolation to the middle layers of the inner crust leads to the unexpected prediction that m will become very large compared with m. (C) 2004 Elsevier B.V. All rights reserved.
机译：在中子星的内部地壳中，密度高于“滴灌”阈值时，未结合的“传导”中子可以自由移动通过核形成的离子晶格。这样的传导中子的相对电流密度n（i）= n（i）将通过物理上定义明确的n（i）= Kp（i）形式的比例关系与相应的平均粒子动量pi相关迁移系数K，在此之前其值尚未计算。使用普通固态和核物理学的方法，在此基于独立粒子逼近的简单量子力学处理，用于将K公式化为中子费米表面上相关基团速度的相空间积分。结果可以描述为“夹带”，该夹带将普通中子质量m更改为每个中子的宏观有效质量，但要遵循采用规定为被认为是'的中子的精确数密度n的惯例。 free” -m（*）= n / K。对于可能与地壳底部有关的“千层面”和“意大利面条”类型的核构型，进行了迁移系数的数值评估。内壳的中间层导致意外的预测，即m与m相比将变得非常大。（C）2004 Elsevier BV保留所有权利。

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