Results of the Pion Beta Experiment

Preliminary results of the 1994 beam time.
In 1994, the Pibeta Collaboration studied the responses of an array of 25 CsI calorimeter modules to monoenergetic beam of positrons and electrons of 70, 50, 30 and 20 MeV/c.

The figure below is the response of the array to a beam of 70 MeV/c positrons. Monte Carlo Simulated events have been superimposed on the data. The energy resolution is 4.5 MeV.

K.Assamagan, 9 Nov 94