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Although $^{79}$Se represents an important branching in the weak s process,the stellar neutron capture cross sections to this isotope have not yet beenmeasured experimentally. In this case, experimental data is essential forevaluating the important branching in the s-process reaction path at $^{79}$Se.The total cross section of $^{78}$Se at a stellar energy of kT = 25 keV hasbeen investigated with a combination of the activation technique andaccelerator mass spectrometry (AMS), since offline decay counting isprohibitive due to the long terrestrial half life of $^{79}$Se (2.80$\pm$0.36$\times10^5$ y) as well as the absence of suitable $\gamma$-ray transitions.The preliminary result for the total Maxwellian averaged cross section is$<\sigma>_{30 keV}$= 60.1$\pm$9.6 mbarn, significantly lower than the previousrecommended value. In a second measurement, also the partial cross section tothe 3.92 min-isomer was determined via $\gamma$-spectroscopy and yielded$<\sigma>_{30 keV}$(part.)= 42.0$\pm$2.0 mbarn.

First measurements of the total and partial stellar cross section to the $s$-process branching-point $^{79}$Se