Symmetry of Neutron-InducedPu239Fission at Individual Resonances

Abstract

979could not be achieved, a more complete and systematic study might prove this preliminary conclusion incorrect. In fact, it has been demonstrated 14 that the need for a six-parameter potential is not fully realized unless the elastic data is fit over a wide angular range. Moreover, the use of a six-parameter potential (i.e., real and imaginary wells of different shapes) admits an extension to DW calculations with complex coupling.

Reactor antineutrino fluxes – Status and challenges

“…Is it possible that the harder neutron flux spectrum in a PWR relative to the one at ILL could produce more fission products that create the shoulder? While there appear to be large fluctuations [36][37][38][39] in the ratio of symmetric to asymmetric fission the average over the epithermal resonances is quite compatible with what is measured with a thermal flux. The lone exception might be 239 Pu that has an isolated and prominent fission resonance at 0.3 eV.…”

Nuclear Fission

“…The vertical lines represent the actual positions of the levels used as input data.large fluctuations have been found in the radiation widths of low-energy resonances. This a g rees with the assignments of both Michaudon (92a) and Van Shee-Dee et al (149) .There is a more solid basis for the division of the 239PU resonances into two groups(29) . The 235U data are shown inFigure 15.…”

Neutron spectroscopy. Progress report, 1 October 1976--30 September 1977. [Summary of research progress in neutron spectroscopy at the Columbia University Department of Mechanical and Nuclear Engineering]

“…The ratio of symmetric to asymmetric masses has been found to vary up to a factor of five 19 . Toraskar & Melkonian 20 also found a factor of two difference between the ratio of symmetric to asymmetric masses, when Be filtered (subthermal) and Sm filtered (0.3 eV resonance) neutrons were used.…”