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We calculate neutron capture cross sections for r-process nucleosynthesis inthe $^{48}$Ca region, namely for the isotopes $^{40-44}$S, $^{46-50}$Ar,$^{56-66}$Ti, $^{62-68}$Cr, and $^{72-76}$Fe. While previously only crosssections resulting from the compound nucleus reaction mechanism(Hauser-Feshbach) have been considered, we recalculate not only thatcontribution to the cross section but also include direct capture on even-evennuclei. The level schemes, which are of utmost importance in the direct capturecalculations, are taken from quasi-particle states obtained with afolded-Yukawa potential and Lipkin-Nogami pairing. Most recent deformationvalues derived from experimental data on $\beta$-decay half lives are usedwhere available. Due to the consideration of direct capture, the capture ratesare enhanced and the "turning points" in the r-process path are shifted toslightly higher mass numbers. We also discuss the sensitivity of the directcapture cross sections on the assumed deformation.

Theoretical neutron-capture cross sections for r-process nucleosynthesis in the $^{48}$Ca region