List of Figures

• Feynman diagrams for the beta decay of a point nucleon
  
• The Beam Line
  
• Beam line set-up for optimization during the test run of 1992
  
• Electronics diagram for beam optimization
  
• Time separation observed on the oscilloscope between , and at 116 MeV/c.
  
• Time of flight in the secondary beam line of , and at various momenta
  
• Beam profiles and divergences measured in 1993
  
• Phase spaces at a waist
  
• Beam spot at the waist
  
• Beam particle identification
  
• Opening angle of the photon
  
• Energy spectrum of a gamma from the decay
  
• Michel spectrum
  
• Experimental apparatus
  
• Active target
  
• Cylindrical multi-wire proportional chamber
  
• Plastic Veto detector
  
• Simulation of the response of the Plastic Veto detector
  
• Shower calorimeter and its segmentation
  
• Tapered pentagonal pyramid
  
• Tapered hexagonal pyramid A
  
• Tapered hexagonal pyramid B
  
• Tapered hexagonal pyramid C
  
• Tapered hexagonal pyramid D
  
• Tapered trapezoidal pyramid HD1
  
• Tapered trapezoidal pyramid HD2
  
• Support structure of the calorimeter
  
• Tapered trapezoidal pyramid VT1
  
• Tapered trapezoidal pyramid VT2
  
• Icosahedron face and its break down
  
• Example of a class II breakdown
  
• Coordinates of the vertices
  
• Relative positions of the modules
  
• Response of the calorimeter as a function of thickness
  
• Results of the development run in the fall of 1989
  
• Radial dependence of the in-flight detector acceptances
  
• Temporal distribution of Michel and events
  
• Simulated calorimeter responses to photons and positrons
  
• Simulated line-shapes of photon-induced showers
  
• Shower backsplash and response of the plastic veto
  
• Definition of the calorimeter in GEANT
  
• Simulation of one pion beta event
  
• Profiles of shower spreading
  
• Trigger efficiency versus threshold
  
• Pion beta single event display
  
• Clustering scheme in the front-end electronics
  
• Electronic diagram for the pion beta trigger
  
• Plastic scintillator fibers used in the 1993 run
  
• Energy distribution of stopped pions
  
• Active target of the 1994 test run
  
• Results of the beam studies undertaken in 1994
  
• Tracking of the positron with the active target
  
• Set-up for light output and light collection uniformity tests
  
• Light output per unit pathlength and non-uniformity
  
• Tomography apparatus
  
• Set-up for tomography
  
• Electronic diagram of the drift chamber read out
  
• Electronic diagram for the tomography trigger
  
• Calibration of the drift chambers
  
• Residuals
  
• Results of the reconstruction
  
• Light collection non-uniformity from tomography
  
• Configuration of the twelve modules used in 1993
  
• Array of 12 CsI crystals and the support structure
  
• Top view of the array
  
• Responses of a subsection of the calorimeter
  
• Array of twenty-six calorimeter modules in 1994
  
• Back view of the array
  
• Response of the array to positrons
  
• Response of the array to electrons
  
• Set-up for the study of decays
  
• Electronic diagram for the trigger
  
• Experimental arrangement for the study of decays
  
• Identification of events
  
• Pion decay curve
  
• Angular resolution function of the calorimeter