Fig. 1. Density distributions of ⁴⁴Mg^[17](a) The proton (x<0) and the neutron (x>0) densities, (b) The density of the neutron core, (c) The density of the neutron halo

Fig. 2. Single neutron levels of ⁴⁴Mg in the canonical basis^[17]

Fig. 3. Neutron halo, neutron core, and neutron density distributions of 0⁺, 2⁺, and 4⁺ states of ⁴⁴Mg by using the DRHBc theory with angular momentum projection

Table 1. Quadrupole deformation parameter, two- or one- neutron separation energy, root-mean-square matter radius, and the amplitude of s-wave components of the halo nuclei in born and carbon isotopes from the DRHBc calculations with the density functional PK1^[62]. Available experimental values are included for comparison. The experimental data of neutron-separation energies are taken from AME2020^[63]