The neutron-induced fission cross section of 238Pu was determined using the surrogate ratio method. The (n,f) cross section over an equivalent neutron energy range 5–20 MeV was deduced from inelastic α-induced fission reactions on 239Pu, with 235U(α,α′f) and 236U(α,α′f) used as references. These reference reactions reflect 234U(n,f) and 235U(n,f) yields, respectively. The deduced 238Pu(n,f) cross section agrees well with standard data libraries up to ~10 MeV, although larger values are seen at higher energies. The difference at higher energies is less than 20%.
Copyright © 2011 The American Physical Society. This article first appeared in Physical Review C 83, no. 5 (May 19, 2011): 054610: 1-54610: 7. doi:10.1103/PhysRevC.83.054610.
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Ressler, J., J. Burke, J. Escher, C. Angell, M. Basunia, C. Beausang, L. Bernstein, D. Bleuel, R. Casperson, B. Goldblum, J. Gostic, R. Hatarik, R. Henderson, R. Hughes, J. Munson, L. Phair, T. Ross, N. Scielzo, E. Swanberg, I. Thompson, and M. Wiedeking. "Surrogate Measurement of the 238Pu(n,f) Cross Section." Physical Review C 83, no. 5 (May 19, 2011): 054610: 1-54610: 7. doi:10.1103/PhysRevC.83.054610.