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Spectroscopic factors (SF) play an important role in nuclear physics andastrophysics. The traditional method of extracting SF from direct transferreactions suffers from serious ambiguities. We discuss a modified method whichis based on including the asymptotic normalization coefficient (ANC) of theoverlap functions into the transfer analysis. In the modified method thecontribution of the external part of the reaction amplitude, typicallydominant, is fixed and the SF is determined from fitting the internal part. Weillustrate the modified method with $(d,p)$ reactions on ${}^{208}{\rm Pb},{}^{12}{\rm C}$, and ${}^{84}{\rm Se}$ targets at different energies. Themodified method allows one to extract the SF, which do not depend on the shapeof the single-particle nucleon-target interaction, and has the potential ofimproving the reliability and accuracy of the structure information. This isspecially important for nuclei on dripline, where not much is known.Comment: accepted in Phys. Rev. C, 4 pages and 2 figure

Combined method to extract spectroscopic information