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Development of the OSO-6 high-energy neutron detector and correlation of measured solar neutron fluxes to solar flares

Description: Thesis. The development of a directional high energy (20 to 160 MeV) neutron detector which was flown to satellite altitudes (500 km; circular equatorial orbit) in the NASA Orbiting Solar Observatory (OSO-6) in August 1969 is described. Both the angle of incidence and the energy of the neutron are determined by a proton-recoil telescope (Pilot B scintillation plastic) which provides the source for proton-recoils and defines the dE/dX versus E method for particle identification and energy determination. The telescope is embedded in a scintillation plastic guard counter envelope which eliminates the unwanted charged particle background as well as recoil protons (electrons) whose energies and direction do not satisfy neutron (gamma-ray) detection requirements, respectively. Results from a Monte Carlo calculation indicate that the overall average efficiency within an average angular acceptance of about 29 deg (FWHM) is approximately (2.25 plus or minus 0.113) x 10/sup -4/. The inflight calibration procedure, the main frame data bit error analysis, and the method for determining the orientation of the detector axis in the spacecraft spin plane are described. Results indicate a discrepancy in the measured (0.461 x 10/sup -2/ plus or minus 0.254 x 10/sup -2/ n/cm/sup 2/sec) and theoretical (2 to 70 n/cm/ sup 2/sec) neutron flux es which suggests a lack of basic underatanding of mechanisms leading to high energy neutron production at the sun. (auth)
Date: February 1, 1974
Creator: Young, F.
Partner: UNT Libraries Government Documents Department

Time-of-flight measurements at the LAMPF low-energy pion channel

Description: Particle identification by time-of-flight techniques was carried out using flight paths between two scintillation counters and between one such counter and the 200-MHz rf structure of the primary proton beam striking the meson production target. With the low-energy pion channel at 103 MeV/c, the two- counter technique yielded clean separation of pions, muons, and electrons. At 195 MeV/c, the rf technique measured the energy resolution of the primary proton beam to be as good as 0.14% FWHM. (auth)
Date: March 1, 1974
Creator: Cooper, M.D.
Partner: UNT Libraries Government Documents Department