Physics
Scientific paper
May 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974phdt.........6g&link_type=abstract
Ph.D. Thesis California Univ., San Diego.
Physics
5
Crab Nebula, Gamma Rays, Pulsars, Pulsed Radiation, Calibrating, Cosmic Rays, Emission Spectra, Planetary Magnetic Fields, Scintillation Counters, X Ray Spectra
Scientific paper
Gamma-rays in the energy range 0.2 to 10 MeV were observed from the Crab Nebula and its central pulsar, NP 0532, on three occasions in 1971. A gamma-ray telescope, a 12 cm diameter by 7.6 cm thick scintillation crystal detector with an active, cup-shaped, CsI(Na) collimator of average thickness 7 cm, and a supporting balloon gondola and telemetry were designed and built. A careful and systematic analysis of the data was made to determine the detector background level to a precision of + or - 0.4% during the four-hour long transit of source through the instrument aperture. Possible drifts of detector calibration and efficiency were monitored to the necessary accuracy. A large change of detector background, which results largely from leakage through the shield of atmospheric gamma-ray and neutron secondaries of cosmic rays, was measured, found to be consistent with a simple model, based on north-south drift in the earth's magnetic field, and was separated in the data from the Crab nebula response to the necessary precision.
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