Detector for measuring the $\pi^+\to e^+\nu_e$ branching fraction
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment(2015)
摘要
The PIENU experiment at TRIUMF is aimed at a measurement of the branching ratio Re/μ=Γ((π+→e+νe)+(π+→e+νeγ))/Γ((π+→μ+νμ)+(π+→μ+νμγ)) with precision <0.1%. Incident pions, delivered at the rate of 60kHz with momentum 75MeV/c, were degraded and stopped in a plastic scintillator target. Pions and their decay product positrons were detected with plastic scintillators and tracked with multiwire proportional chambers and silicon strip detectors. The energies of the positrons were measured in a spectrometer consisting of a large NaI(Tℓ) crystal surrounded by an array of pure CsI crystals. This paper provides a description of the PIENU experimental apparatus and its performance in pursuit of Re/μ.
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关键词
NaI(Tℓ),CsI,Scintillation detectors,Pion decay
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