Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XVI. Inclusion of self-energy effects in pairing
Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XVI. Inclusion of self-energy effects in pairing
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DOI：
10.1103/physrevc.93.034337
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发表时间：
2016-03-31
影响因子：
3.1
通讯作者：
Pearson, J. M.
中科院分区：
文献类型：
--
作者：
Goriely, S.;Chamel, N.;Pearson, J. M.
在前人工作的基础上，我们提出了一个新的Hartree-Fock-Bogoliubov（HFB）质量模型族：HFB-30、HFB-31和HFB-32，并沿着了它们的相互作用BSK 30、BSK 31和BSK 32。主要的新特征是依赖于密度梯度的纯现象学配对项。这使我们能够有一个适合现实的核物质计算，其中第一次包括自能修正的散装配对项，而在不对称均匀核物质的核子有效质量的行为显着改善。此外，在粒子-空穴通道中，保留了我们早期工作中的所有高度现实的约束。特别是，包含t（4）和t（5）项的非常规Skyrme力仍然被限制为符合实际的中子物质状态方程，该状态方程的刚度足以支持大质量中子星PSR J1614-2230和PSR J 0348 +0432。所有非物理的长波长自旋和自旋-同位旋不稳定性的核物质，包括非物理的过渡到一个极化状态的中子星物质，被消除。我们的三个相互作用的特征在于由对称系数J的值为30，31，和32兆电子伏，分别。模型HFB-31（J = 31 MeV）与2353个核质量数据库的最佳拟合为0.561 MeV。该模型还拟合了电荷半径数据，均方根误差为0.027 fm。
Extending our earlier work, a new family of three Hartree-Fock-Bogoliubov (HFB) mass models, labeled HFB-30, HFB-31, and HFB-32, is presented, along with their underlying interactions, BSk30, BSk31, and BSk32, respectively. The principle new feature is a purely phenomenological pairing term that depends on the density gradient. This enables us to have a bulk pairing term that is fitted to realistic nuclear-matter calculations in which for the first time the self-energy corrections are included, while the behavior of the nucleon effective masses in asymmetric homogeneous nuclear matter is significantly improved. Furthermore, in the particle-hole channel all the highly realistic constraints of our earlier work are retained. In particular, the unconventional Skyrme forces containing t(4) and t(5) terms are still constrained to fit realistic equations of state of neutron matter stiff enough to support the massive neutron stars PSR J1614-2230 and PSR J0348+0432. All unphysical long-wavelength spin and spin-isospin instabilities of nuclear matter, including the unphysical transition to a polarized state in neutron-star matter, are eliminated. Our three interactions are characterized by values of the symmetry coefficient J of 30, 31, and 32 MeV, respectively. The best fit to the database of 2353 nuclear masses is found for model HFB-31 (J = 31 MeV) with a model error of 0.561 MeV. This model also fits the charge-radius data with an root-mean-square error of 0.027 fm.