Fusion cross sections of Be-11, Be-10 and Be-9 have been measured on B
i-209 target at 30 similar to 70 MeV. Due to the neutron halo effect o
f Be-11, a large enhancement or suppression of the fusion cross sectio
n around the Coulomb barrier was theoretically predicted. Comparing th
e excitation function of Be-11 with Be-10 at near the Coulomb barrier
region, no significant difference has been observed.