Using both the absolute and relative surrogate techniques, the 236U(n,f) cross section was deduced over an equivalent neutron energy range of 0 to 20 MeV. A 42 MeV 3He beam from the 88 Inch Cyclotron at Lawrence Berkeley National Laboratory was used to perform a (3He,α) pickup reaction on targets of 235U (Jπ=7/2−) and 238U (Jπ = 0+) and the fission decay probabilities were determined. The 235U(3He,αf) and 238U(3He,αf) were surrogates for 233U(n,f) and 236U(n,f), respectively. The cross sections extracted using the surrogate method were compared to directly measured cross sections. The sensitivity of these cross sections to the Jπ -population distributions was explored.
Copyright © 2007 The American Physical Society. This article first appeared in Physical Review C 76, no. 1 (July 10, 2007): 014606: 1-14606: 8. doi:10.1103/PhysRevC.76.014606.
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Lyles, B., L. Bernstein, J. Burke, F. Dietrich, J. Escher, I. Thompson, D. Bleuel, R. Clark, P. Fallon, J. Gibelin, A. Macchiavelli, M. McMahan, L. Phair, E. Rodriguez-Vieitez, M. Wiedeking, C. Beausang, S. Lesher, B. Darakchieva, and M. Evtimova. "Absolute and Relative Surrogate Measurements of the 236U(n,f) Cross Section as a Probe of Angular Momentum Effects." Physical Review C 76, no. 1 (July 10, 2007): 014606: 1-14606: 8. doi:10.1103/PhysRevC.76.014606.