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We construct a new Hartree-Fock-Bogoliubov (HFB) mass model, labeled HFB-18,with a generalized Skyrme force. The additional terms that we have introducedinto the force are density-dependent generalizations of the usual $t_1$ and$t_2$ terms, and are chosen in such a way as to avoid the high-densityferromagnetic instability of neutron stars that is a general feature ofconventional Skyrme forces, and in particular of the Skyrme forces underlyingall the HFB mass models that we have developed in the past. The remainingparameters of the model are then fitted to essentially all the available massdata, an rms deviation $\sigma$ of 0.585 MeV being obtained. The new model thusgives almost as good a mass fit as our best-fit model HFB-17 ($\sigma$ = 0.581MeV), and has the advantage of avoiding the ferromagnetic collapse of neutronstars.

Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XI: Stabilizing neutron stars against a ferromagnetic collapse