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The total cross section of europium has been measured over a range of neutron energy from 0.08 to 58 ev. Resonances occur at 0.327, 0.461, 1.055, 1.76, 2.46 2.73, 3.35, 3.84, 6.25, 7.36, and 8.98 ev. Between 10- and 20-ev resonances were found at 10.6, 11.8, 12.8, 15.1, and {~}19.5; however, it is probable that several additional resonances were present but not observed because of insufficient instrument resolution. Many resonances are present above 20 ev which could not be resolved. The strength, σ₀Γ², and various other Breit-Wigner parameters have been obtained for the resonances below 10 ev. The ratio of the average reduced neutron width to the average level spacing, Γₙ⁰D, was found to be 3.5×{}10^-4 for Eu¹⁵¹ and 3.3×{}10^-4 for Eu¹⁵³.
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Sailor et al. (1954) studied this question.
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