Abstract
The measurement of the relative changes Δλ/λ of the radioactive decay by the electron capture process is a direct experimental way to determine the relative changes of the electron charge density on the nucleus. Here we present the results of the experiment with 57Co, where the differences of the decay rate were determined for different chemical states of 57Co. We analyzed the experimental time dependences of the activity of 57Co by means of the direct approximation method and the specialized optimization tool – a genetic algorithm. Using these methods improved the accuracy of the final Δλ/λ values between 57Co and 57Co(Pd), 57CoCl2,57CoS, 57CoSO4⋅7H2O, which are in good agreement with theoretical considerations reflecting the electron charge rearrangement and screening effects.
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