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Iyengar, A.*; Norman, E. B.*; Howard, C.*; Angell, C.; Kaplan, A.*; Ressler, J. J.*; Chodash, P.*; Swanberg, E.*; Czeszumska, A.*; Wang, B.*; et al.
Nuclear Instruments and Methods in Physics Research B, 304, p.11 - 15, 2013/06
被引用回数:8 パーセンタイル:53.67(Instruments & Instrumentation)Measurements of beta-delayed -ray spectra following 14-MeV neutron-induced fissions of Th, U, and Np were conducted at Lawrence Berkeley National Laboratory's 88-Inch Cyclotron. Spectra were collected for times ranging from 1 minute to 14 hours after irradiation. Intensity ratios of -ray lines were extracted from the data that allow identification of the fissioning isotope.
Czeszumska, A.*; Angell, C.; Burke, J. T.*; Scielzo, N. D.*; Norman, E. B.*; Austin, R. A. E.*; Boutoux, G.*; Casperson, R. J.*; Chodash, P.*; Hughes, R. O.*; et al.
Physical Review C, 87(3), p.034613_1 - 034613_6, 2013/03
被引用回数:12 パーセンタイル:64.7(Physics, Nuclear)Neutron-induced fission cross section data are needed in various fields of applied and basic nuclear science. However, cross sections of short-lived nuclei are difficult to measure directly due to experimental constraints. The first experimental determination of the neutron-induced fission cross section of Np at non-thermal energies was performed. The Surrogate Ratio Method (SRM) was employed to indirectly deduce the Np(,) cross section. The surrogate reactions used were U and U with the reference cross section given by the well-known Np(,) cross section. The ratio of observed fission reactions resulting from the two formed compound nuclei, Np and Np, was multiplied by the directly-measured Np(,) cross section to determine theNp(,) cross section. The Np(,) cross section was determined with an uncertainty ranging between 3 - 30% over the energy range of 0.2 - 20 MeV.