Date: 16 Jun 2006

First hints on a change of the 22 Na βdecay half-life in the metal Pd

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For the β+-decay of 22Na in the metallic environment Pd cooled to T = 12 K the 22Na half-life was observed to be shorter by 1.2±0.2%. The result is consistent with --but lower than-- the prediction of the Debye plasma model.