[en] By means of the on-line mass separator at Gesellschaft fuer Schwerionenforschung, Darmstadt, we produced ¹¹⁴Ba through the ⁵⁸Ni(⁵⁸Ni,2n) reaction, separated it as a ¹¹⁴Ba¹⁹F⁺ beam, and implanted it into a stopper foil positioned in the center of an array of track detectors, which were used to search for ¹²C radioactivity of ¹¹⁴Ba. A total number of (5.4±1.7).10⁴¹¹⁴Ba atoms were implanted. No ¹²C event was found after a total exposure time of 116 hours, corresponding to a ⁵⁸Ni beam dose of 1.3.10¹⁷. The resulting upper limit of 3.4.10^-5 (84% c. 1.) for the branching ratio for ¹²C decay of ¹¹⁴Ba is considerably lower than the limits obtained in previous experiments, which represents an inconsistency at levels of more than 90%. A semiempirical estimate of 19.3 MeV for the upper limit of the Q-value for ¹²C decay of ¹¹⁴Ba is derived. (orig.)