Abstract

Gamma-ray spectra from neutron capture in 206Pb (radiogenic lead) in the energy range 1.5 to 8.5 MeV were recorded using time-of-flight techniques. The spectrometer was a NaI(Tl) crystal, 20.8 cm long and 22.6 cm in diameter. The spectra are dominated by γ-transitions to levels with large single-particle strength, in agreement with predictions of semi-direct capture theories. The theories predict enhancements of the direct capture cross section by a factor of 10–15 in the region of the giant dipole resonance. The observed enhancement is about 50.

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