Giant Neutron Halo in Exotic Calcium Nuclei

The properties of even-even Ca isotopes are studied using the
relativistic continuum Hartree-Bogoliubov theory. The calculations reproduce very wwell the experimental binding energies E and two neutron separation energies S_2n. The predicted neutron drip nuclei is ⁷²Ca. From the analysis of S_2n, the neutron radii and neutron density distribution, giant neutron haloes are predicted in Ca isotopes with A > 60.