Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XIII. The 2012 atomic mass evaluation and the symmetry coefficient
Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XIII. The 2012 atomic mass evaluation and the symmetry coefficient
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DOI：
10.1103/physrevc.88.024308
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发表时间：
2013-08
影响因子：
3.1
通讯作者：
S. Goriely;N. Chamel;J. Pearson
中科院分区：
文献类型：
--
作者：
S. Goriely;N. Chamel;J. Pearson
我们的三个Hartree-Fock-Bogoliubov（HFB）质量模型系列，标记为BSK 19，BSK 20和BSK 21，在这里通过（a）改装到2012年原子质量评估（AME）和（B）改变对称系数J进行扩展。五个新模型，标记为BSK 22到BSK 26，沿着它们的质量表，分别为HFB-22到HFB-26。这些模型的特征在于包含t4和t5项的非常规Skyrme力，即，分别是通常的t1和t2项的密度相关的推广。使用高度真实的接触配对力。Skyrme力被限制为符合实际的中子物质状态方程，其刚性足以支持大质量中子星PSR J1614−2230和PSR J 0348 +0432。均匀核物质的非物理自旋和自旋-同位旋不稳定性，包括中子星物质向极化状态的过渡，都被新的力消除了。模型BSk 24（J=30 MeV）和BSk 25（J=29 MeV）最适合2353个核的新数据库，其均方根（rms）偏差分别为0.55和0.54 MeV。尽管数据库更大，但这甚至比我们在2003年AME拟合中发现的0.58 MeV的均方根偏差更好。当J=32 MeV时，均方根偏差上升到0.63 MeV。由反质子散射得到的中子皮厚度与我们从质量中得到的结论是一致的。
Our family of three Hartree-Fock-Bogoliubov (HFB) mass models, labeled BSk19, BSk20, and BSk21, is here extended by (a) refitting to the 2012 Atomic Mass Evaluation (AME), and (b) varying the symmetry coefficient J. Five new models, labeled BSk22 to BSk26, along with their mass tables, HFB-22 to HFB-26, respectively, are presented. These models are characterized by unconventional Skyrme forces containing t4 and t5 terms, i.e., density-dependent generalizations of the usual t1 and t2 terms, respectively. Highly realistic contact pairing forces are used. The Skyrme forces are 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. Unphysical spin and spin-isospin instabilities of homogeneous nuclear matter, including the transition to a polarized state in neutron-star matter, are eliminated with the new forces. The best fits to the new database of 2353 nuclei are found for models BSk24 (J=30 MeV) and BSk25 (J=29 MeV), for which the root-mean square (rms) deviations are 0.55 and 0.54 MeV, respectively. Despite the larger database this is even better than the rms deviation of 0.58 MeV that we found with our fits to the 2003 AME. With J=32 MeV the rms deviation rises to 0.63 MeV. The neutron-skin thicknesses derived from antiproton scattering are shown to be consistent with the conclusions that we have drawn from masses.