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

Abstract

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.

Authors:
 [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5];  [3];  [2];  [6]; ORCiD logo [3];  [7];  [8];  [9];  [3];  [6];  [6];  [2];  [6];  [6];  [6];  [9] more »;  [10] « less
  1. Univ. of Warsaw, Warsaw (Poland); Rutgers Univ., New Brunswick, NJ (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Warsaw, Warsaw (Poland); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. 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)
  5. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Univ. of Tennessee, Knoxville, TN (United States)
  7. Univ. of Warsaw, Warsaw (Poland)
  8. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  9. Vanderbilt Univ., Nashville, TN (United States)
  10. Louisiana State Univ., Baton Rouge, LA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1492173
Alternate Identifier(s):
OSTI ID: 1373799
Grant/Contract Number:  
AC05-00OR22725; FG02-96ER40983; NA0002132; FG02-96ER40978; FG02-96ER41006; FG05-88ER40407
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 5; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

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., and Zganjar, E. F. Impact of Modular Total Absorption Spectrometer measurements of β decay of fission products on the decay heat and reactor ν¯e flux calculation. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.119.052503.
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. Impact of Modular Total Absorption Spectrometer measurements of β decay of fission products on the decay heat and reactor ν¯e flux calculation. United States. doi:10.1103/PhysRevLett.119.052503.
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., and Zganjar, E. F. Wed . "Impact of Modular Total Absorption Spectrometer measurements of β decay of fission products on the decay heat and reactor ν¯e flux calculation". United States. doi:10.1103/PhysRevLett.119.052503. https://www.osti.gov/servlets/purl/1492173.
@article{osti_1492173,
title = {Impact of Modular Total Absorption Spectrometer measurements of β decay of fission products on the decay heat and reactor ν¯e flux calculation},
author = {Fijałkowska, Aleksandra G. and Karny, Marek and Rykaczewski, Krzysztof P. and Rasco, Bertis C. and Grzywacz, Robert Kazimierz and Gross, Carl J. and Wolińska-Cichocka, Marzena and Goetz, K. C. and Stracener, Daniel W. and Bielewski, W. and Goans, R. and Hamilton, J. H. and Johnson, J. W. and Jost, C. and Madurga, M. and Miernik, Krzysztof and Miller, D. and Padgett, S. W. and Paulauskas, S. V. and Ramayya, A. V. and Zganjar, E. F.},
abstractNote = {Here, 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 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 ¯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.},
doi = {10.1103/PhysRevLett.119.052503},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 5,
volume = 119,
place = {United States},
year = {2017},
month = {8}
}

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Figures / Tables:

Figure 1 Figure 1: Experimental total energy deposited in MTAS detector emitted in the decay of 139Xe (grey) compared with the simulated detector response based on ENSDF data (blue) and the simulated detector response based on the final result of the analysis (red).

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.