  Infinite nuclear matter mass model and the relativistic mean field theory
show strong evidence of new neutron magic numbers 100, 150, 164; proton magic
number 78 and new islands of stability around N=100, Z $\simeq$ 62; N=150,
Z=78; and N= 164, Z $\simeq$ 90 in the drip-line regions of nuclear chart. It
is shown that shell effect stabilizes here the instability due to nuclear force
giving rise to a new phenomenon; in contrast to the phenomena of fission isomer
and super heavy elements where Coulomb instability is overcome by the same.
