A new measurement of the and spectra at several atmospheric depths with the CAPRICE98

P. HANSEN

Proceeding of the ‘Intenartional school of Cosmic Ray Astrophysics 13 th Course, 2-14 June 2002 (Erice Sicily) (pages 217-226).

Año: 2002 p. 217 - 226

A new measurements of the mu+ and  mu - spectra at several atmospheric depths in the momentum range 0.3-20 GeV/c as made by the balloon-borne experiment CAPRICE98. The data were collected during the ascent of the payload on the 28 May 1998 from Fort Summer, New Mexico, USA.This apparatus consists of a magnet spectrometer, with a superconducting magnet and a drift-chamber tracking device, a time of flight scintillator system, a silicon-tungsten imaging calorimeter and a gas ring imaging Cherenkov detector.This gas RICH radiator made it possible to safely identify  mu+ up to 20 GeV/c. This is the first time that the  mu+  component has been measurement over a wide momentum range.