We have deduced the cross section for 237U(n, f) over an equivalent neutron energy range from 0 to 20 MeV using the surrogate ratio method. A 55 MeV4He beam from the 88 inch cyclotron at Lawrence Berkeley National Laboratory was used to induce ﬁssion in the following reactions: 238U(α, αf) and 236U(α, αf). The 238U reaction was a surrogate for 237U(n, f), and the 236U reaction was used as a surrogate for 235U(n, f). Scattered α particles were detected in a fully depleted segmented silicon telescope array over an angle range of 35° to 60° with respect to the beam axis. The ﬁssion fragments were detected in a third independent silicon detector located at backward angles between 106° and 131°.
Copyright © 2006 The American Physical Society. This article first appeared in Physical Review C 73, no. 5 (May 5, 2006): 054604:1-54604:8. doi:10.1103/PhysRevC.73.054604.
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Burke, J., L. Bernstein, J. Escher, L. Ahle, J. Church, F. Dietrich, K. Moody, E. Norman, L. Phair, P. Fallon, R. Clark, M. Deleplanque, M. Descovich, M. Cromaz, I. Lee, A. Macchiavelli, M. Mcmahan, L. Moretto, E. Rodriguez-Vieitez, F. Stephens, H. Ai, C. Plettner, C. Beausang, and B. Crider. "Deducing the U237(n,f) Cross Section Using the Surrogate Ratio Method." Physical Review C 73, no. 5 (May 5, 2006): 054604:1-54604:8. doi:10.1103/PhysRevC.73.054604.