COUPLING EFFECTS IN THE EXTRACTION OF SPECTROSCOPIC FACTORS

Direct nuclear reactions are used to extract spectroscopic information about exotic nuclei. A spectroscopic factor (SF) is often extracted from measurements assuming a single-particle structure for the projectile. Being peripheral, these reactions are mostly sensitive to the asymptotic normalization coefficient (ANC) of the wave function. We study the accuracy of analysing peripheral reactions with a single-particle approximation of the nucleus. We consider a collective core+n model, in which the core can be excited. Fair agreement is obtained between the SF inferred from the single-particle approximation and the one obtained within the collective model when large SFs are concerned.