Abstract
Nuclear Β-decay leaves the residual nucleus partially polarized in the direction of emission of the Β-particle. If parity conservation in nuclear states is violated, an asymmetry about 90‡ of a Β-γ directional correlation can be present (existence of a σnucleus p γα cos σ term). The asymmetry has been looked for in a Β-γ cascade of59Fe and was found to be zero within one standard deviation of 0.3%. The bearing of this result on an upper limit forF is discussed (F is the relative amplitude of the irregular wave function with respect to the regular one). As a by-product we obtained (63.1 ±0.8) days for the life-time of59Fe.
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