Neutron halo and related structure in light nuclei

The works appeared recently dealing with exotic halo nuclei have displayed striking variations in nuclear shell structures and revealed the emergence of novel magic numbers unlike the stable nuclei. One of the significant reasons for these variations is the effect of tensor forces on nuclear structures, which has been reviewed in this report. Also, with the consideration of three-body nuclear forces, the known dramatic peculiarity over the oxygen isotopes has been debated to clarify why is the heaviest bound oxygen isotope. Finally, we focus at loosely bound neutron states within the frame of light halo nuclei to grasp why the weak binding plays a crucial role in observing the change in energies of lowest states. Keywords: Exotic nuclei, neutron-halo nuclei, , nuclear tensor force, three-body interaction force, binding energy