Mathematics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt........19s&link_type=abstract
Ph.D. Thesis Kiel Univ. (Germany). Mathematische-Naturwissenschaftlichen Fakultaet.
Mathematics
Cosmic Rays, Iron Isotopes, Mass Spectra, Calibrating, Cerenkov Counters, Scintillation Counters, Spectral Resolution
Scientific paper
The mass of the main isotopes of iron in cosmic radiation was measured using active electronic detectors and passive range detectors. This combination of electronic detectors (Cerenkov and scintillation counters) and range detectors (a stack of sheets of several elastic materials), allows to separate events occurring with a time difference of 0.45 sec. In the electronic part the particle charge was determined by an energy/energy loss measurement; in the range detector it was determined from the trace the particle causes in the material (resolution of 0.2 charge units). The charge measurement was calibrated using the iron nuclei of the cosmic radiation. The combination of Cerenkov signals and range values allows the mass determination (resolution between 0.4 and 0.7 atomic mass units). The average value for iron isotope masses in cosmic radiation is 55.8. This mass measurement has the advantage that it does not require a calibration by heavy ion irradiation which leads to errors. Errors due to changing conditions are also avoided by keeping pressure and temperature constant.
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