Abstract
Cross sections for the reactions Mo 100(γ, n + γ, p), Mo 98(γ, np), Mo 97(γ, p), Mo 92(γ, n) and Mo 92(γ, 2n + γ, np) have been determined by activation methods for photon energies up to 33 MeV. The photoproton cross section, which exhibits a maximum at 21 MeV, accounts for some ten percent of the total absorption and is about equal to the sum of the cross sections for the measured multiple reactions. The results are discussed in terms of competition between direct nucleon emission and the formation of a compound nucleus, and it is argued that the high proton yield derives from transitions between shell model states of low angular momentum. The data are consistent with the existence of an E1 “overtone” in the region above 20 MeV.
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