Abstract
The decay spectrum of negative muons was investigated in the Duke Helium Bubble Chamber, operated in a magnetic field of 14 000 G. About 50 000 pictures were scanned for μ− decays, and ∼5 000 decays were observed and measured. An analysis of 2 276 selected events yielded a value for the Michel parameter, ϱ=0.751±0.034. A statistical analysis of the momentum scale confirmed the accuracy of our experimental assumptions. Our ϱ-value is in good agreement with the most recent results on the decay spectrum of positive muons and is in accord with the predictions of the two component neutrino and universalV−A theories.
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