Abstract
During the past year, we have continued our work on the photon detector for the MEGA experiment at Los Alamos. The MEGA photon detector is designed to observe the 52.83 MeV photon produced in a {pi} {yields} e{gamma} decay with an energy resolution of 1.25 MeV, a position resolution of 2 {times} 5 mm{sup 2}, a directional resolution of 10{degree}, a time resolution of 500 ps, and an efficiency of about 5.4%. (All quoted resolutions are FWHM.) It consists of three independent concentric cylindrical pair spectrometers mounted within a 1.5 T magnetic field produced by a superconducting solenoid magnet. Each pair spectrometer includes two thin (0.045 radiation lengths each) Pb foils to convert photons into e{sup +}e{sup {minus}} pairs. The two smaller pair spectrometers have three drift chamber layers to track the e{sup +}e{sup {minus}} pairs and thereby determine both their locations and their vector momenta. The third pair spectrometer has four layers of drift chamber, together with a larger turning region, to provide better tracking information for high energy photons such as those from the {pi}{sup 0} {yields} 2{gamma} decay.
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