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Physics Letters B
An experiment has been set up at the Institut Laue-Langevin in Grenoble to search for free neutron-antineutron oscillations. No candidate events were observed in the first run of the experiment, providing a lower limit in the oscillation time T.~ > 107 s at 90% CL, which improves the previous experimental limit by an order of magnitude.doi:10.1016/0370-2693(90)90601-2 fatcat:m2cqmqmvzjhafoqlttlk7fklmy