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Theoretical neutron-capture cross sections for r-process nucleosynthesis in the $^{48}$Ca region by Rauscher, T.; Böhmer, W.; Kratz, K. -L.; Balogh, W.; Oberhummer, H. is a scholarly article available to read on EtoBox.

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

We calculate neutron capture cross sections for r-process nucleosynthesis in the $^{48}$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 cross sections resulting from the compound nucleus reaction mechanism (Hauser-Feshbach) have been considered, we recalculate not only that contribution to the cross section but also include direct capture on even-even nuclei. The level schemes, which are of utmost importance in the direct capture calculations, are taken from quasi-particle states obtained with a folded-Yukawa potential and Lipkin-Nogami pairing. Most recent deformation values derived from experimental data on $\beta$-decay half lives are used where available. Due to the consideration of direct capture, the capture rates are enhanced and the "turning points" in the r-process path are shifted to slightly higher mass numbers. We also discuss the sensitivity of the direct capture cross sections on the assumed deformation.

Author

Rauscher, T.; Böhmer, W.; Kratz, K. -L.; Balogh, W.; Oberhummer, H.

Published

2015

Language

EN