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• W2741736120 abstract "An in situ measurement of the lunar neutron density from 20 to 400 g cm -z depth below the lunar surface was made by the Apollo 17 Lunar Neutron Probe Experiment (LNPE) using particle tracks produced by the I°B (n, c0 7Li reaction. Both the absolute magnitude and the depth profile of the neutron density are in good agreement with theoretical calculations by Lingenfelter, Canfield, and Hampel. However, relatively small deviations between experiment and theory in the effect of Cd absorption on the neutron density and in the relative 149Sm to X57Gd capture rates reported previously (Russ et al., 1972) imply that the true lunar 15VGd capture rate is about one half of that calculated theoretically. The first round of analyses of the Apollo 11 lunar samples showed that isotopic variations produced by the cumulative longterm neutron exposure of lunar samples could be precisely measured and that the neutron capture effects could be used as a tracer of lunar surface mixing processes (Eugster et al., 1970). Subsequent to this first report, approximately 30 papers have been published concerning neutron capture in lunar materials. Proper interpretation of the lunar sample data requires knowledge of the magnitude of the neutron capture rates and how they vary with depth in the first few meters of the lunar surface. Further, because the neutron capture reactions for different nuclei occur at different energies, some knowledge of the neutron energy spectrum is required to intercompare capture rates for various nuclei. Explicit values for fluxes and/or capture rates as a function of neutron energy and depth have been calculated theoretically by Lingenfelter et al. (1972; hereafter referred to as LCH), by Armstrong and Alsmiller (1971), and by Kornblum et al. (1973). The Lunar Neutron Probe Experiment (LNPE) was carried on Apollo 17 in order to put the capture rates and their depth dependence, as nearly as possible, on an experimental basis. The LNPE contained two target-detector systems, both using particle track detectors. We have previously (Woolum and Burnett, 1974a; hereafter referred to as paper I) published the results of the 235U-mica fission detectors. Excellent agreement was obtained, both for the magnitude and for the depth de- pendence of the fission rate, between the experimental (LNPE) and theoretical (LCH) rates. In this paper, we report the results of the capture rates of I°B, based on the low energy I°B (n, ~) 7Li neutron capture reaction. We shall focus here on the experimental results and the documentation of their accuracy. The implications of the LNPE data * Contribution No. 2539, Division of Geological and Planetary Sciences, California Institute of" @default.
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• W2741736120 date "1975-01-01" @default.
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• W2741736120 title "MEASUREMENT OF THE L UNAR N EUTRON D ENSITY P ROFILE" @default.
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