Response of several threshold reactions in reference fission neutron fields

Cross sections for (n,p) reactions on 27Al, 46,47,48Ti, 54,56Fe, 58Ni, 59Co, and 64Zn and for 238U fission have been measured relative to fission cross sections for 235U or 238U and the results of this work have been reported. These data have been renormalized to accommodate recent revisions of the 235U and 238U fission evaluated cross sections which are accounted for in the ENDF/B-IV files. The response of the renormalized data to two commonly used reference neutron fields have been investigated: i) pure thermal-neutron fission of 235U, and ii) the spontaneous fission of 252Cf. The results of this analysis and a comparison with corresponding recent information from the literature are discussed. Two additional topics are addressed in appendices: i) the preparation and calibration of uranium deposits used in cross section measurements, and ii) errata in some earlier reports from our laboratory on this same general subject. (10 figures, 14 tables) (U.S.)