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The total cross sections of Be, O, Na, and Ca were investigated as a function of neutron energy in ranges between 30 and 1000 kev with a resolving power of approximately 20 kev. In Be a resonance was observed at 625 kev, presumably caused by p-neutrons. The resonance in O at 440 kev is probably due to p-neutrons forming a compound nucleus of spin 3/2. In Na and Ca numerous peaks were found. The cross section of Ca has values below 1.5 barns over a considerable range of energies.
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Adair et al. (1949) studied this question.
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