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The s-process branching at mass number A = 176 depends on the couplingbetween the high-K ground state and a low-lying low-K isomer in 176Lu. Thiscoupling is based on electromagnetic transitions via intermediate states athigher energies. The properties of the lowest experimentally confirmedintermediate state at 839 keV are reviewed, and the transition rate betweenlow-K and high-K states under stellar conditions is calculated on the basis ofnew experimental data for the 839 keV state. Properties of further candidatesfor intermediate states are briefly analyzed. It is found that the couplingbetween the high-K ground state and the low-K isomer in 176Lu is at least oneorder of magnitude stronger than previously assumed leading to crucialconsequences for the interpretation of the 176Lu/176Hf pair as an s-processthermometer.

Properties of the 5- state at 839 keV in 176Lu and the s-process branching at A = 176