The PIBETA spectrometer for studying rare and forbidden decays of muons and pions
- Cite this article as:
- Baranov, V.A., Kalinnikov, V.A., Karpukhin, V.V. et al. Instrum Exp Tech (2005) 48: 168. doi:10.1007/s10786-005-0030-1
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The construction and characteristics of the PIBETA spectrometer are described. This spectrometer is designed to implement a program of precise measurement of pion β decay π+ → π0 + e+ + νe at the Paul Scherrer Institute (Switzerland). A spherical calorimeter, consisting of 240 crystals of pure CsI scintillator and embracing a solid angle of ∼3π, is the main detector of the setup. In addition, the spectrometer is composed of an active collimator (which also acts as a beam degrader), a segmented active plastic target, two multiwire cylindrical proportional chambers, a 20-element cylindrical plastic hodoscope, and veto counters of cosmic muons.