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Abstract:
A measurement of ground level muons was performed with the NMSU-WIZARD/CAPRICE
magnet spectrometer in Fort Sumner, New Mexico, USA in Spring 1997.
The spectrometer was equipped with a superconducting magnet, a time-of-flight
system, an electromagnetic calorimeter and a Ring Imaging Cherenkov detector
with a gaseous C_4 F_10 radiator.
Positive and negative muon spectra and the mu^+ to mu^- ratio are presented
in the momentum range from 200 MeV/c to 120 GeV/c. The results are compared
with results obtained with a similar experiment at a different geomagnetic
location. The data show latitude dependent geomagnetic effects.