An analysis of the differential cross sections of the l2C (d ,p )13C (ground state, org.s., 1 /2J) and inBe(c/,/?)"Be (g.s., 1 /2, ) reactions at the incident deuteron energies of 11.8, 25.9, and 30 MeV for the first system, and 12.0 and 25.0 MeV for the second system has been performed by applying the coupled-reaction-channels method. The spectroscopic factors 5cxpI, asymptotic normalization coefficients (ANCs), and rms radii of the last neutron in the ground states and the first excited states of the stable l3C and the radioactive "B e nuclei were extracted. The existence of neutron halos in the first excited state of 13C and the ground state of "B e is confirmed. The rms radii of halos in these states were found to be 5.72 ± 0.16 and 8.0 ± 0.2 fm, respectively, in agreement with experimental results. We showed that a halo is also formed in the 0.32 MeV