Elsevier

Nuclear Physics A

Volume 390, Issue 2, 6 December 1982, Pages 221-239
Nuclear Physics A

Analysis of neutron multiplicities in photonuclear reactions from 30 to 140 MeV in heavy elements

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Abstract

From event-by-event records of observed photoneutron multiplicities for photons from 30 to 140 MeV on several heavy targets (Sn, Ce, Ta and Pb), it was possible to determine the mean number of photoneutrons, \̄gn, for each photon energy and the widths W of the multiplicity distributions. The mean neutron numbers increase smoothly from about three to six over the photon energy span for all four targets. The widths go from about one to two neutrons in the same interval. When these measurements are combined with other photonuclear information, it is possible to extract the average numbers of fast neutrons and fast protons and the average number of evaporation neutrons emitted per photoabsorption.

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