标题： 核力介子交换理论中的离壳配对关联 显示英文标题

标题： Off-shell pairing correlations from meson-exchange theory of nuclear forces

摘要： 为处理核系统中的非质量壳对相关联而建立了一个模型。 这些关联由介子交换的正常和异常福克自能构成耦合集。 重子的复数能隙方程的核与介子的介质谱函数有关，该谱函数在随机相位近似中非微扰地进行评估。 该模型应用于中子星外壳中的低密度中子物质，通过将相互作用建模为长程一光子交换分量和短程分量的和，其中短程分量以兰道费米液体参数来参数化。 描述了一种高效的算法，用于求解所得埃利亚什伯格型非线性积分方程的自洽解。 我们发现，非质量壳对相关联可延伸到相当高的能量——约100 MeV的量级——且对相关联的实部和虚部表现出复杂的结构。 在低能量下，由于与π介子模式的耦合导致的中子对关联的阻尼较小，但随着能量增加，阻尼变得越来越重要，最终占主导地位。 显示英文摘要

摘要： A model is developed for treating off-mass-shell pairing correlations in nuclear systems. These correlations are described by a coupled set of meson-exchange normal and anomalous Fock self-energies of baryons. The kernel of the complex gap equation for baryons is related to the in-medium spectral function of mesons, which is evaluated non-perturbatively in the random phase approximation. The model is applied to the low density neutron matter in neutron star crusts by modeling the interaction as a sum of a long-range one-pion exchange component and a short range component parameterized in terms of Landau Fermi-liquid parameters. An efficient algorithm is described for the self-consistent solution of the resulting Eliashberg type non-linear integral equations. We find that the off-shell pairing correlations extend to rather high energies - of the order of 100 MeV - with the real and imaginary parts of the pairing gap showing a complicated structure. At low energies the damping of the neutron pair correlations due to the coupling to the pionic modes is small, but becomes increasingly important, and eventually dominant as the energy is increased.