Discrete gamma radiation in interaction of 14.9-MeV neutrons with natural lead

The gamma radiation in the interaction of 14.9-MeV neutrons with a natural lead sample is investigated by the loral gamma radiation measurement techni que (TGRM). Forty-nine prompt: gamma lines and 8 delayed gamma lines, which come from (n,n' gamma) and (n, 2n gamma) reactions of Pb-206, Pb-207, and Pb-208 are identified, and their differential production cross sections at 55, 90 and 140 deg are determined. Six mixed gamma-ray peaks are separated, and the production data of the prompt and delayed components are given sep arately. The production cross sections of three isomeric states (1013.7 keV (13/2)(+), 5.5 ms in Pb-205m; 2200.2 keV; 7(-), 124 mu s in Pb-206m; and 1 633.3 keV, (13/2)(+), 0.81s in Pb-207m) are accurately determined They are in good agreement with some recent experimental and theoretical results. Th is is the most successful example of applying TGRM in an (n,x gamma) experi mental study following after the aluminum study.