Speaker
Summary
The physics program of the PANDA project at the international FAIR facility at GSI
(Germany) is based on a state-of-the-art universal detector for strong interaction
studies at high intensity cooled antiproton beam with an energy up to 15 GeV. This
program relies heavily on the capability to measure photons with excellent energy and
position resolution. For this purpose PANDA has proposed to employ electromagnetic
calorimeters using two different technologies: a compact calorimeter around the
target based on lead tungstate crystals and a fine-segmented Shashlyk-type
calorimeter in the forward region.
The Shashlyk calorimeter prototype for the PANDA experiment has been
constructed
at IHEP and experimentally tested using the 1-19 GeV electron beam with high
precision momentum tagging at the IHEP accelerator. Results of the first
measurements for the fine-segmented Shashlyk calorimeter prototype in the wide
energy
range up to 19 GeV are presented. Two cell sizes (5.5x5.5 cm^2 and 11x11 cm^2)
were
used in the prototype. Fair energy and position resolutions having been obtained are
in a good agreement with the Monte-Carlo simulations. Detection inefficiency due to
holes for straight light fibers has turned out to be negligible for PANDA. The
results of the Monte-Carlo study of pi0 reconstruction for the both cell size
prototypes are also presented in front of an approaching test beam study of this.
