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Energy measurements have been made by means of a scintillation spectrometer of the gamma rays produced by bombarding several elements with 4.5-Mev neutrons. The following gamma rays have been found (energies in Mev): B: 0.70, 2.20; F: 1.34, 6.10; Al: 0.84, 1.02, 2.27, 3.10; Fe: 0.85, 1.20, 1.73, 2.05, 2.50, 3.52; Zr: 0.92, 2.20, 3.23; Pb: 0.79, 1.36, 2.70. These energy values can be used to determine accurate values of the nuclear energy levels for those elements where the level scheme has been determined uniquely by observations on the scattered neutron energy spectrum.
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G. Griffith (1955) studied this question.
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