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The GERmanium Detector Array, GERDA, is designed to search for neutrinolessdouble beta (0$\nu\beta\beta$) decay of $^{76}$Ge and it is installed in theLaboratori Nazionali del Gran Sasso (LNGS) of INFN, Italy. In this review, thedetection principle and detector setup of GERDA are described. Also, the mainphysics results by GERDA Phase I, are discussed. They include the measurementof the half-life of 2$\nu\beta\beta$ decay, the background decomposition of theenergy spectrum and the techniques for the discrimination of the background,based on the pulse shape of the signal. In the last part of this paper, theestimation of a limit on the half-life of 0$\nu\beta\beta$ ($T^{0\nu}_{1/2}>2.1\cdot 10^{25}$ yr at 90% C.L.) and the comparison with previous results arediscussed. GERDA data from Phase I strongly disfavour the recent claim of0$\nu\beta\beta$ discovery, based on data from the Heidelberg-Moscowexperiment.

Results on neutrinoless double beta decay from GERDA Phase I