The absorption of slow negative π-mesons by the elements in nuclear emulsions

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Abstract
In all previous investigations of the absorption of slow negative π-mesons by the constituent elements in nuclear emulsions, the separation of the observed events into those involving the nuclei of the light elements (carbon, nitrogen and oxygen), and of the heavy elements (silver and bromine) has been achieved largely by means of the ‘α-particle method’. In order to effect a separation of the events in light and heavy nuclei independently of the α-particle, and other indirect methods, an experiment has been performed in which π-mesons were allowed to pass into -emulsions of different compositions.