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The branching ratio Γ_γ0Γ_α for the $d+t$ reaction has been measured between deuteron energies of 45 and 146 keV. Pair-coincidence spectrometry and pulse-shape discrimination were employed to reduce the neutron effects in the NaI(Tl) gamma-ray detector. The branching ratio is found to be constant over the energy range of the measurements with a best value Γ_γ0Γ_α=(5.4±1.3)×10^-5. This value is significantly greater than cluster-model calculations of the branching ratio.
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Cecil et al. (1984) studied this question.
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