An apparatus for the measurement of the transverse polarization of positrons from the decay of polarized muons

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2000-12, Vol.455 (2), p.329-345
• Main Authors: Barnett, I.C., Bee, C., Bodek, K., Budzanowski, A., Danneberg, N., Eberhardt, P., Fetscher, W., Hilbes, C., Janousch, M., Jarczyk, L., Kirch, K., Kistryn, S., Klement, J., Köhler, K., Kozela, A., Lang, J., Llosa, G., Markiewicz, M., Morelle, X., Naviliat, O., Schweizer, T., Smyrski, J., Sromicki, J., Stephan, E., Strzałkowski, A., Szeker, K., Zejma, J.
• Format: Article
• Language: English
• Subjects: Cluster recognition; Data acquisition; Magnetic components and techniques; Nuclear Experiment; Physics; Polarized beams and targets; Scintillation detectors; Tracking detectors
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/S0168-9002(00)00525-8

An apparatus for the measurement of the two transverse polarization components P T 1 and P T 2 of the positrons from polarized μ + decay is described. It makes use of a stroboscopic method which cancels many systematic asymmetries and allows one to use muon stop rates in the order of up to 10 8 s −1 . The experiment aims at an accuracy of Δ P T 1 =Δ P T 2 =3×10 −3 and by that at an improvement of the existing limit by nearly one order of magnitude. With these results one will obtain an improved model-independent value for the Fermi coupling constant G F and more stringent limits to possible violations of time reversal invariance in a purely leptonic reaction.