Detection of Nonresonant Neutron Capture inPb207Via the Threshold Photoneutron Cross Section forPb208

Abstract
A nonresonant neutron-capture cross section was found in Pb207 by measuring the asymmetry of a resonance in the threshold photoneutron cross section for Pb208. The magnitude of the nonresonant component is too large to be accounted for solely by the direct-capture mechanism of Lane and Lynn, but it might be accounted for by Brown's semidirect reaction mechanism.