Neutron capture cross sections and solar abundances of /sup 160,161/Dy, /sup 170,171/Yb, /sup 175,176/Lu, and /sup 176,177/Hf have been measured

摘要: The neutron capture cross sections and solar abundances of $^{160,\phantom{\rule{0ex}{0ex}}161}\mathrm{Dy}$, $^{170,\phantom{\rule{0ex}{0ex}}171}\mathrm{Yb}$, $^{175,\phantom{\rule{0ex}{0ex}}176}\mathrm{Lu}$, $^{176,\phantom{\rule{0ex}{0ex}}177}\mathrm{Hf}$ have been measured. With this data base $s$-process studies carried out to determine the density temperature investigate nucleosynthesis $^{176}\mathrm{Lu}$ clock. From various branchings was found be (0.8-1.8)\ifmmode\times\else\texttimes\fi{}${10}^{8}$ neutrons per ${\mathrm{cm}}^{3}$ $\mathrm{kT}$ 18---28 keV. On basis present data, proved not applicable as a cosmic clock because sensitivity half-life but can used instead stellar thermometer. Constraints for ($kT=20\ensuremath{-}28$ keV) were in good agreement with investigated branchings.