Author/Authors :
Hof، نويسنده , , M. and Bremerich، نويسنده , , M. and Gِbel، نويسنده , , H. and Hams، نويسنده , , T. and Menn، نويسنده , , W. and Simon، نويسنده , , M. and Barbier، نويسنده , , L.M and Christian، نويسنده , , E.R and Geier، نويسنده , , S. and Gupta، نويسنده , , S.K. and Krizmanic، نويسنده , , J.F and Mitchell، نويسنده , , J.W. and Ormes، نويسنده , , J.F. and Streitmatter، نويسنده , , R.E. and Davis، نويسنده , , A.J. and de Nolfo، نويسنده , , G.A. and Mewaldt، نويسنده , , R.A. and Schindler، نويسنده , , S.M.، نويسنده ,
Abstract :
The Isotope Magnet Experiment (ISOMAX) is a new balloon-borne instrument developed to measure the isotopic composition of the light elements in the cosmic radiation, in particular to obtain the ratio of the radioactive 10Be to stable 9Be. ISOMAX was first flown in August 4–5, 1998, from Lynn Lake, Manitoba, Canada. ISOMAX has a geometry factor of 450 cm2 sr and was configured for this flight with a large, Helmholtz-like, superconducting magnet in combination with a drift-chamber tracking system, a state-of-the-art time-of-flight system and two aerogel Cherenkov detectors to measure light isotopes with a mass resolution of better than 0.25 amu. In the 1998 flight the obtained maximum detectable rigidity of the magnetic spectrometer was 970 GV/c for helium at 60% of the full magnetic field. ISOMAX took data for more than 16 h at float altitudes above 36 km. We here present the performance of the individual detectors and initial isotopic results of the instrument.
