The properties of halo structure for 17 B

The total reaction cross section (1724 ± 93 mb) of 17 B at the energy of 43.7 A MeV on C target has been measured by using the transmission method at the Radioactive Ion Beam Line in Lanzhou (RIBLL). Assuming 17 B consists of a core 15 B plus two halo neutrons, the total cross section of 17 B on C target was calculated with the zero-range Glauber model, where double Gaussian density distributions and Gaussian plus HO density distributions were used. It can fit the experimental data very well. The characteristic of halo structure for 17 B was found with a large diffusion of the neutrons density distribution.