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Photodisintegration cross sections were measured for deuterium with Laser-Compton scattering ␥ beams at seven energies near threshold. Combined with the preceding data, R(E)ϭN a v for the p(n,␥)D reaction is for the first time evaluated based on experimental data with 6% uncertainty in the energy region relevant to the big bang nucleosynthesis ͑BBN͒. The result confirms the theoretical evaluation on which the BBN in the precision era relies.

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