  Using HF+BCS method with Skyrme forces we analyze the neutron drip line. It
is shown that around magic and new magic numbers the drip line may form
stability peninsulas. It is shown the location of these peninsulas does not
depend on the choice of Skyrme forces. It is found that the size of the
peninsulas is sensitive to the choice of Skyrme forces and the most extended
peninsulas appear with the SkI2 set.
