Bounds to the size of halo nuclei

Inspired by the Bertlmann-Martin inequality relating the rms radius of the ground state wave function to the lowest dipole transition energy, we have proposed a dimensional relationship to be used in weakly bound two-body sys tems. In the present work, it is applied to halo nuclei. Lower and upper bo unds to the size of halo nuclei are compared to values obtained from reacti on cross sections. The case of the deuteron is also presented.