Author/Authors :
Cooper، نويسنده , Paul W , M.D and Armijo، نويسنده , , V and Black، نويسنده , , J.K and Bolton، نويسنده , , R.D and Carius، نويسنده , , S and Espinoza، نويسنده , , C and Hart، نويسنده , , G and Hogan، نويسنده , , G.E and Gonzales، نويسنده , , A and Kroupa، نويسنده , , M.A and Mischke، نويسنده , , R.E and Sandoval، نويسنده , , J and Schilling، نويسنده , , S and Sena، نويسنده , , J and Suazo، نويسنده , , G and Whitehouse، نويسنده , , D.A. and Wilkinson، نويسنده ,
Abstract :
A design for extremely low mass, high-resolution multiwire proportional chambers (MWPC) was achieved by the MEGA collaboration in its experiment to search for the lepton family number violating decay μ→eγ. To extend the present branching ratio limit by over an order of magnitude, these MWPCs were operated in high particle fluxes. They showed minimal effects of aging, and evidenced spatial and energy resolutions for the orbiting positrons from muon decay which were consistent with our design parameters. The unique features of these chambers, their assembly into the MEGA positron spectrometer, and their performance during the experiment are described in this paper.
