New measurement of the altitude dependence of the atmospheric muon intensity -: art. no. 092005

We present a new measurement of atmospheric muons made during an ascent of the High Energy Antimatter Telescope balloon experiment. The muon charge ratio mu(+)/mu(-) as a function of atmospheric depth in the momentum interval 0.3-0.9 GeV/c is presented. The differential mu(-) intensities in the 0.3-50 GeV/c range and for atmospheric depths between 4-960 g/cm(2) are also presented. We compare these results with other measurements and model predictions. We find that our charge ratio is similar to1.1 for all atmospheric depths and is consistent, within errors, with other measurements and the model predictions. We find that our measured mu(-) intensities are also consistent with other measurements, and with the model predictions, except at shallow atmospheric depths.