Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt.........7g&link_type=abstract
Thesis (PhD). UNIVERSITY OF MARYLAND COLLEGE PARK, Source DAI-B 61/04, p. 1990, Oct 2000, 138 pages.
Physics
1
Isomax
Scientific paper
Secondary nuclei in the cosmic radiation, which are produced in the process of propagation and nuclear fragmentation of primary particles through the interstellar medium, can be used to gain information on the propagation mechanism, and the details of the cosmic ray diffusion and the gas distribution in the galaxy. The Goddard ISOMAX experiment is a state-of-the-art mass spectrometer constructed for the purpose of measuring the abundance ratios of the isotopes of Beryllium, especially [10]Be which has a half life of 1.51 Myrs, at energies around 1 GeV per nucleon. This will enable the balloon borne instrument, which was launched for the first time in summer 1998, to put constraints on the typical travel times of cosmic rays and the density of the propagated medium-hence on the question how much time cosmic rays spend traveling outside the galactic disk. Construction and calibration of the instrument are presented and the first results are reported.
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