The halo factor is one of the experimental data which describes a distribution of neutrons in nuclear periphery. In the presented paper we use Skyrme-Hartree (SH) and the Relativistic Mean Field (RMF) models and we calculate the neutron excess factor $Delta_B$ defined in the paper which differs slightly from halo factor $f_{rm exp}$. The results of the calculations are compared to the measured data.
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