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A search for the double beta decay transition of $^{94}$Zr into the firstexcited state of $^{94}$Mo has been performed at the Felsenkeller undergroundlaboratory in Dresden, Germany. A 341.1 g zirconium sample with naturalisotopic composition has been measured for 43.9 d in an ultra low backgroundgamma spectroscopy setup. No signal has been observed and a new best lowerhalf-life limit is set as $5.2\times10^{19}$ yr (90% CI). This limit is validfor the $0\nu\beta\beta$ and $2\nu\beta\beta$ decay into excited states of$^{94}$Mo but cannot distinguish between the two modes. Existing limits areimproved by 50%.

An improved half-life limit of the double beta decay of $^{94}$Zr into the excited state of $^{94}$Mo