Total fusion cross section for theBe9+Si28system

The total fusion cross sections for the system ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$+${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ have been measured in the ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ bombarding energy range 30-60 MeV by the detection of evaporation residues in a $\Delta E-E$ ionization-chamber surface-barrier detector telescope. Although the measured ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$+${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ fusion cross sections are similar to those in which a similar compound system is formed by heavy-ion ($A\ge 12$) interaction, the ratio of the measured fusion cross section to the total reaction cross section is much smaller than that observed for other systems and is attributed to the structure of ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ and the ease with which it breaks up into smaller fragments. This view is consistent with the anomalous ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$+${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ elastic scattering results.