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Description
Photon-induced fission product yield (FPY) studies were conducted on 238 U. Fission was induced at the Triangle Universities Nuclear Laboratory’s High Intensity γ-ray Source using monoenergetic γ-rays of Eγ = 8.0, 9.8, 11.2, 13.0, and 15.5 MeV. The FPYs of short-lived isotopes were measured using a RApid Belt-driven Irradiated Target Transfer System (RABITTS). The RABITTS is a fully automated 1-m track system which performs cyclic activation by moving the target between irradiation and counting positions. Following γ-ray beam irradiation, the target was rapidly transferred (in 0.4 s) to the counting position located at the midpoint between two well-shielded High Purity Germanium detectors, which measure the γ-ray energy spectrum associated with the decay of the induced activity. The irradiation-counting cycle was repeated until the summed data have sufficient statistical precision. The counting data were used to validate the half-lives of the fission products. More than 30 fission products with half-lives ranging from 1 s to 600 s were uniquely identified, and their yield values determined.
This work was supported in part by the National Nuclear Security Administration Stewardship Science Academic Alliances grant no. DE-NA0003887, DE-NA0004069, and the U.S. Department of Energy, Office of Nuclear Physics, under grant no. DE-FG02-97ER41033. This work was also partially supported by the US Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344 by Los Alamos National Laboratory under Contract No. 89233218CNA000001.
