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- W2056162617 abstract "The energy distribution of the neutrons radiated by targets bombarded by protons of energy 244 Mev has been measured. Neutrons in the forward direction from Be, C, and Pb targets were observed, and in a direction 15ifmmode^circelsetextdegreefi{} forward from Be and C targets.The neutrons were allowed to bombard a polyethylene radiator; scattered protons were observed by a scintillation counter coincidence telescope of four anthracene crystals. The effect of the carbon in the polyethylene was determined by taking similar data with a carbon radiator. The last counter in the telescope was used as a proportional counter, proton energies being determined by measuring the height of the scintillation pulse in this crystal. A gated amplifier, turned on by a coincidence among the four crystals of the telescope, assured that only those pulses in the proportional counter corresponding to protons traversing the telescope from the radiator were counted. The entire neutron spectrum from about 120 to 240 Mev was measured at once by measuring the spectrum of pulses in the proportional crystal with a 24-channel pulse-height analyzer.All the spectra observed were found to be peaked, the energies at the peaks being about 215, 195, and 180 Mev for Be, C, and Pb, respectively, in the forward direction, and at about 175 and 165 for Be and C at 15ifmmode^circelsetextdegreefi{}.The carbon and lead spectra were more broadly peaked than the beryllium spectra, and the 15ifmmode^circelsetextdegreefi{} spectra were broader than the 0ifmmode^circelsetextdegreefi{} spectra, the full widths at half-maximum being 27 percent, 33 percent, and 49 percent for Be, C, and Pb forward spectra, and 40 percent and 42 percent for Be and C at 15ifmmode^circelsetextdegreefi{}." @default.
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- W2056162617 date "1952-10-01" @default.
- W2056162617 modified "2023-10-18" @default.
- W2056162617 title "Neutron Energy Distributions from Be, C, and Pb Bombarded by 245-Mev Protons" @default.
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- W2056162617 doi "https://doi.org/10.1103/physrev.88.1" @default.
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