DELAYED NEUTRON EQUILIBRIUM SPECTRA FOR U-235, U-238 AND Pu-239


David J. Pullen, Walter A. Schier, Gus P. Couchell, Eric S. Jacobs, Marcel F. Villani, Mahmoud H. Haghighi and Paul R. Bennett

Department of Physics and Applied Physics
University of Lowell, Lowell, MA 01854, U.S.A.

Equilibrium delayed neutron energy spectra have been measured which encompass up to 93% of the delayed neutrons emitted in the fission of U-235, U-238 and Pu-239. These measurements are compared with equilibrium spectra generated from six-group spectra derived from our separate aggregate measurements and also from compilations based on individual precursor data.

KEYWORDS: fission delayed neutrons, 235U, 238U, 239Pu, equil. energy spectra