Spectroscopic Factors for Pickup Reactions onCa40

The spectroscopic factors for the $d_{\frac{3}{2}}$, $s_{\frac{1}{2}}$, and $f_{\frac{7}{2}}$ pickup from ${\mathrm{Ca}}^{40}$ have been calculated in the shell model for two different forces, and the results were compared with distorted-wave Born-approximation (DWBA) analyses of recent experiments. The calculated spectroscopic factors for $f_{\frac{7}{2}}$ pickup were found to be considerably smaller than the DWBA results. Various reasons for this discrepancy are discussed.