학술논문
Impact of Modular Total Absorption Spectrometer measurements of β decay of fission products on the decay heat and reactor νe flux calculation.
Document Type
Article
Author
Fijałkowska, A.; Karny, M.; Rykaczewski, K. P.; Rasco, B. C.; Grzywacz, R.; Gross, C. J.; Wolińska-Cichocka, M.; Goetz, K. C.; Stracener, D. W.; Bielewski, W.; Goans, R.; Hamilton, J. H.; Johnson, J. W.; Jost, C.; Madurga, M.; Miernik, K.; Miller, D.; Padgett, S. W.; Paulauskas, S. V.; Ramayya, A. V.
Source
Subject
*SPECTROMETERS
*NUCLEAR fuel elements
*RUBIDIUM compounds
*
*
Language
ISSN
0031-9007
Abstract
We report the results of a β-decay study of fission products 86Br, 89Kr, 89Rb, 90gsRb, 90mRb, 90Kr, 92Rb, 139Xe, and 142Cs performed with the Modular Total Absorption Spectrometer (MTAS) and on-line mass-separated ion beams. These radioactivities were assessed by the Nuclear Energy Agency as having high priority for decay heat analysis during a nuclear fuel cycle. We observe a substantial increase in β feeding to high excited states in all daughter isotopes in comparison to earlier data. This increases the average γ-ray energy emitted by the decay of fission fragments during the first 10000 s after fission of 235U and 239Pu by approximately 2% and 1%, respectively, improving agreement between results of calculations and direct observations. New MTAS results reduce the reference reactor νe flux used to analyze reactor νe interaction with detector matter. The reduction determined by the ab initio method for the four nuclear fuel components, 235U, 238U, 239Pu, and 241Pu, amounts to 0.976, 0.986, 0.983, and 0.984, respectively. [ABSTRACT FROM AUTHOR]