Measurement of the Gamma-Ray Spectrum from Radiative Muon Decay
1960; American Institute of Physics; Volume: 120; Issue: 3 Linguagem: Inglês
10.1103/physrev.120.983
ISSN1536-6065
AutoresC. O. Kim, Warnick J. Kernan, C. M. York,
Tópico(s)Atomic and Subatomic Physics Research
ResumoThe energy spectrum of the gamma rays emitted by inner bremsstrahlung in the muon decay process, ${\ensuremath{\mu}}^{+}\ensuremath{\rightarrow}{e}^{+}+\ensuremath{\nu}+\overline{\ensuremath{\nu}}+\ensuremath{\gamma}$, has been measured by means of a large sodium iodide crystal. Only those gamma rays which were time-coincident with the decay electrons were recorded. These decay electrons were detected in a scintillation counter telescope adjoining the crystal counter. The counter geometry permitted detection of events with angles between the electron and gamma ray in the range from 0\ifmmode^\circ\else\textdegree\fi{} to 26\ifmmode^\circ\else\textdegree\fi{}. The muons were obtained by stopping a positive pion beam in a block of material. By measuring the gamma-ray spectra from muons originating first in carbon and then aluminum, a correction could be made for bremsstrahlung externally produced by the decay electrons. The measured spectrum is in agreement with that predicted by the theory with an average ratio of 1.02\ifmmode\pm\else\textpm\fi{}0.10.
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