Bruno Rossi and Norris
نویسنده
چکیده
HE purpose of the experiment described in the present paper was to determine the disintegration curve of mesotrons at rest. The experiment was performed by investigating the delayed emission of the disintegration electrons, which takes place after the absorption of mesotrons by matter. Experiments more or less closely related to the present one have been reported previously by Montgomery, Ramsey, Cowie, and Montgomery, ' by Rasetti, ' and by de Souza Santos. ' The experiment by Montgomery and his collaborators failed to give any significant result. The experiment by Rasetti consists essentially of the determination of two points of the disintegration curve and gives a mean life of (1.5+0.3) ysec. under the assumption of an exponential decay. De Souza Santos reports some very surprising results which seem to indicate that the disintegration processes are not distributed according to an exponential but rather according to a Gaussian law with center at 5 p,sec. The previous experiments were performed by means of special coincidence circuits designed in such a way as to record only those electrons which were emitted from the absorber within preselected time intervals after the arrival of the mesotrons. Ke have succeeded in increasing the selectivity and the statistical accuracy of the method considerably by recording all decay electrons and measuring the time interval between the arrival of each mesotron and the emission of the corresponding electron. The circuit used for this measurement will be referred to as the time circuit.
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