Latest results of Skyrme-Hartree-Fock-Bogoliubov mass formulas

6th Nuclear Physics in Astrophysics

物理学;天文学

Goriely, S.^1 ; Chamel, N.^1 ; Pearson, J.M.^2

Institut d'Astronomie et d'Astrophysique, ULB, CP226, Bruxelles

1050, Belgium^1

Dépt. de Physiqué, Université de Montréal, Montréal

QC

H3C 3J7, Canada^2

关键词: Accurate mass;    Equation of state;    Latest development;    Neutron matter;    Neutron stars;    Root mean square deviations;    Skyrme interaction;    Skyrme-forces;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/665/1/012038/pdf
DOI  :  10.1088/1742-6596/665/1/012038

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The latest developments made in deriving accurate mass predictions within the microscopic Skyrme Hartree-Fock-Bogolyubov (HFB) approach are described. Using the HFB method, we have refitted our BSk20 and BSk21 models, on which were based the HFB-20 and HFB-21 mass tables, to the 2353 measured masses of nuclei with N and Z ≥ 8 given in the newly available 2012 Atomic Mass Evaluation. In addition, we have now investigated the sensitivity to the symmetry coefficient J and the stiffness of the neutron matter equation of state. We present here in all 5 new Skyrme interactions, along with their corresponding mass tables. The root-mean square deviation obtained with our preferred model (HFB-24) with respect to essentially all the 2353 available mass data falls to 0.549 MeV, the best value ever found within the mean-field framework. Since our Skyrme force is also constrained by the properties of pure neutron matter this new model is particularly well-suited for application to astrophysical problems involving a neutron-rich environment, such as the elucidation of the r-process of nucleosynthesis, and the description of supernova cores and neutron-star crusts.