Impact of Modular Total Absorption Spectrometer measurements of β decay of fission products on the decay heat and reactor ν¯e flux calculation

Fijałkowska, Aleksandra G.; Karny, Marek; Rykaczewski, Krzysztof P.; Rasco, Bertis C.; Grzywacz, Robert Kazimierz; Gross, Carl J.; Wolińska-Cichocka, Marzena; Goetz, K. C.; Stracener, Daniel W.; Bielewski, W.; Goans, R.; Hamilton, J. H.; Johnson, J. W.; Jost, C.; Madurga, M.; Miernik, Krzysztof; Miller, D.; Padgett, S. W.; Paulauskas, S. V.; Ramayya, A. V.; Zganjar, E. F.

doi:10.1103/PhysRevLett.119.052503

Title: Impact of Modular Total Absorption Spectrometer measurements of $β$ decay of fission products on the decay heat and reactor ${\bar{ν}}_{e}$ flux calculation

Journal Article · 01 August 2017 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.119.052503 · OSTI ID:1492173

Fijałkowska, Aleksandra G. ^[1]; Karny, Marek ^[2];

^[3]; Rasco, Bertis C. ^[4];

^[5]; Gross, Carl J. ^[3]; Wolińska-Cichocka, Marzena ^[2]; Goetz, K. C. ^[6];

^[3]; Bielewski, W. ^[7]; Goans, R. ^[8]; Hamilton, J. H. ^[9]; Johnson, J. W. ^[3]; Jost, C. ^[6]; Madurga, M. ^[6]; Miernik, Krzysztof ^[2]; Miller, D. ^[6]; Padgett, S. W. ^[6]; Paulauskas, S. V. ^[6]; Ramayya, A. V. ^[9] more »

Univ. of Warsaw, Warsaw (Poland); Rutgers Univ., New Brunswick, NJ (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Warsaw, Warsaw (Poland); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Louisiana State Univ., Baton Rouge, LA (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Warsaw, Warsaw (Poland)
Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Vanderbilt Univ., Nashville, TN (United States)
Louisiana State Univ., Baton Rouge, LA (United States)

Here, we report the results of a β-decay study of fission products ⁸⁶Br, ⁸⁹Kr, ⁸⁹Rb, ⁹⁰^gsRb, ^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 10 000 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 ¯ν_e flux used to analyze reactor ¯ν_e 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1492173

Alternate ID(s):: OSTI ID: 1373799

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 119; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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