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Neutron Fission Cross Sections for 231Th, 233Th, 235U, 237U, 239U, 241Pu, and 243Pu from 0.5 to 2.25 MeV Using (t, pf) Reactions

J. D. Cramer, H. C. Britt

Nuclear Science and Engineering

Volume 41 / Number 2 / August 1970 / Pages 177-187


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Experiments were performed using the (t, p) stripping reaction followed by fission to provide experimental measurements of fission probabilities. The neutron-induced fission cross section of the corresponding even-odd neutron targets can be deduced from these experimental (t, pf) data with the aid of an optical model calculation of the cross section for the formation of the compound nucleus by neutron absorption. Experimental measurements of the (n, f) cross section of the longer-lived targets such as 235U and 241Pu are used to test the validity of this technique by directly comparing experimental results and computed results from (t, pf) experiments. Ratios of Γnf are determined from these experimental data and are compared to previously published values.

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