The Muonium-Antimuonium-Conversion-Spectrometer [Archive]

Macs.

10-18-2005, 03:54 PM

http://www.spiegel.de/img/0,1020,297884,00.jpg

When you eat a chimpanze, be sure think about your bookpanse.

Went to the ride, and the barkeep asked: "You ponchos have touched holy ground, Senior" and Victor (FROM ALACAMBRIDGE) TOOK A STEP

A VERY FGOOD FVREVRAHJFIELFDSAGLHKDSlöhkjgfdsDEÖHBKJ

PALLO; MARCO

POLO WHERE CAN YOU KEEP THE WHEENERS ??? Quesche !

http://www.aspencountry.com/aspen/assets/product_images/product_lib/31000-31999/31140.jpg

Gypsum Fantastic touched my pants and ate my friends, so thats where it ends. (Ryhme)

10-18-2005, 03:56 PM

The Muonium-Antimuonium-Conversion-Spectrometer MACS
http://mmbar.web.psi.ch/pict/mmbar/macssmall.gif (http://mmbar.web.psi.ch/pict/mmbar/macs.gif)

MACS (schematic view) (http://mmbar.web.psi.ch/pict/mmbar/macs.gif) is designed to identify both constituents of the antimuonium (muonium) atom after its decay. The disintegration of the atom is due to muon decay with the dominant channel http://mmbar.web.psi.ch/mmbar/mudecay.gif. The particle in the atomic shell has negligible (<10-6) influence on the decay process. Electrons (positrons) from muon decay have a characteristic energy spectrum (http://mmbar.web.psi.ch/pict/mmbar/michel.gif) ranging up to 53 MeV. In this experiment they are detected in a magnetic spectrometer (http://mmbar.web.psi.ch/mmbar/sindrum.html) operated at 1kG which allows to reconstruct the particle's momentum and sign of charge.

The particle from the atomic shell has a mean energy corresponding to a Rydberg energy of 13.5 eV (spectrum) (http://mmbar.web.psi.ch/pict/mmbar/rydberg.gif). It is electrostatically accelerated (typ. 8 keV) and guided by a magnetic transport system (http://mmbar.web.psi.ch/mmbar/transp.html) to a position sensitive "positron" detector (http://mmbar.web.psi.ch/mmbar/posdet.html) which is able to detect electrons as well. The energy of the particle is determined by the accelerator voltage. Time of flight information provides an additional discrimination against background. From the impact position on the "positron" detector and the magnetic field lines of the transport system the path of the particle is reconstructed. Together with the trajectory from the muon decay particle the decay vertex of the atom can be determined.

MACS can be operated to detect muonium or antimuonium decays by reversing the polarity of the accelerator voltage and all magnetic fields. Therefore many systematic uncertainties of the spectrometer's parameters cancel in the analysis of the conversion probability.