Abstract
On the basis of the improved level scheme of $^{176}\mathrm{Lu}$ it is demonstrated that the stellar s-process production as well as the stellar beta decay rate of that nucleus depend strongly on temperature. This behavior results from the completely different half-lives of the ground state and the isomer; since these states are coupled by induced transitions in the hot stellar photon bath, the effective half-life of $^{176}\mathrm{Lu}$ is drastically reduced. The ${5}^{\mathrm{\ensuremath{-}}}$ state at 838.64 keV was identified as the most efficient mediating level. Consequently, $^{176}\mathrm{Lu}$ can no longer be considered as a chronometer for the age of the s process; instead, it can be interpreted as an s-process thermometer yielding a temperature range between 2.4\ifmmode\times\else\texttimes\fi{}${10}^{8}$ to 3.6\ifmmode\times\else\texttimes\fi{}${10}^{8}$ K.
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