Reaction mechanism ofB8breakup at the Fermi energy

The longitudinal momentum distributions of $^{7}\mathrm{Be}$ fragments in the breakup of $^{8}\mathrm{B}$ on a carbon target have been measured at 36 MeV/u. The different mechanisms have been distinguished by coincidence measurements. The longitudinal momentum distributions of $^{7}\mathrm{Be}$ fragments from both the stripping and the diffraction mechanisms are consistent with the results of noneikonal calculations and CDCC calculations. The full widths at half maximum of the longitudinal momentum distributions are $124\ifmmode\pm\else\textpm\fi{}17$ and $92\ifmmode\pm\else\textpm\fi{}7$ MeV/$c$ for the stripping and diffraction components, respectively. The comparison with the different model calculations is discussed. It is crucial to separate the different reaction mechanisms experimentally to benchmark nuclear reaction theories.