General Technique of Quasielastic Spectrum Study: Application toBe9

We have established a formula which allows the extraction of the nuclear cross sections from experimental quasielastic spectra. Tests have been carried out to prove the consistency of our techniques. In particular, we prove that a hitherto unmeasured cross section can be calculated from a limited number of experimental data. These techniques have been applied to ${\mathrm{Be}}^9$. Interpretations of the extracted cross sections have been estimated on three models.