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For a variety of radionuclides which decay via $\beta^{-}$ and a weak$\beta^{+}$-channel the electron-capture (EC) is not observed yet. As theinterest of exact decay characteristica increased again, not least with theneed of reliable data for experiments on investigation of the neutrinolessdouble-beta-decay, an experiment for the investigation of the $^{76}$As-EC wasperformed. The first time observation of the EC of $^{76}$As by this experimentresulted in a total branching-ratio for the EC / $\beta^{+}$-channel of$p_\mathrm{EC} = 0.0269 \pm \left(0.0080(\mathrm{stat.}) \pm0.0029(\mathrm{sys.}) \right)$ and $p_\mathrm{EC} = 0.0263 \pm\left(0.0077(\mathrm{stat.}) \pm 0.0047(\mathrm{sys.}) \right)$ according totwo different methods. For the branching of this decay-channel into the firstexcited- and the ground state of \gess a limit was obtained.

First observation of the electron capture of $^{76}$As