Doubly radiative thermal neutron capture in 2H and 16O: Experiment and theory |
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Authors: | AB McDonald ED Earle MA Lone FC Khanna HC Lee |
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Institution: | Atomic Energy of Canada Limited, Chalk River Nuclear Laboratories, Chalk River, Ontario, Canada KOJ 1JO |
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Abstract: | Measurements and calculations are presented for the cross sections for two-photon emission following thermal neutron capture in 2H and 16O. Upper limits for σ2γ were measured in both cases. For 2H, σ2λ = 8 ± 15 μb, for γ-rays in the energy region 700 < Eγ < 5550 keV. A detailed threeparticle calculation gives σ2γtot = 26 nb. For 16O, the experimental result is σ2γ = 3 ± 19 μb for 1200 < Eγ < 2943 keV. A single-particle, direct-capture calculation for 16O gives σ2γtot = 41 nb. Contributions from excitation of the giant dipole state of the core change this result by ± 16 %. In a separate measurement the total cross section for 16O(n, γ)17O was measured to be 202 ± 28 μb. Branching ratios of (82 ± 3)% and (18 ± 3)% were determined for decays to the 3055 and 871 keV levels of 17O, respectively. |
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Keywords: | Nuclear reactions |
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