WiZard SiW imaging calorimeter: a preliminary study on its particle identification capability during a balloon flight in 1993

The WiZard Collaboration is engaged in a program to study the antimatter components of the cosmic rays. A silicon-tungsten (WiW) imaging calorimeter has been developed as part of this program. We present its performance and preliminary results, obtained during a balloon flight on September 8, 1993. The flight was dedicated to the measurement of the positron spectrum in the energy range 4-50 GeV and took place from Ft. Sumner, New Mexico. © 1995.