Time-of-flight Measurements Made with Neutrons from Nuclear Explosions in Space PDF Download

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Book Description
During the 1962 high altitude test series, measurements of the energy spectra of the neutrons from three devices were made by the space physics group of the Los Alamos Scientific Laboratory. The explosions occurred at high altitudes, above the atmosphere, and near Johnston Island. The measurements were made with detectors flown from Kauai, Hawaii to above the atmosphere, on two-stage Nike-Apache rockets. The range between the explosion and the detector packages was about 1300 km. For each of the tests, two moderated fission detectors and two plastic fluor detectors were flown, except that on the third test, an extra fluor detector which had been recovered from the ocean, was also flown. Useful records were obtained for every rocket flown, which makes thirteen neutron spectrum measurements recovered out of thirteen attempts. Although the prime objective of the experiments was to measure the neutron energy spectra, a secondary objective was accomplished in the field of time-of-flight measurements on the resonance structure of various nuclides. Since the experiments were not designed specifically to make cross section measurements, the results are not as detailed as they could be, but some useful results were obtained.