Decays of the Three Top Contributors to the Reactor ν¯e High-Energy Spectrum, Rb92 , Y96gs , and Cs142 , Studied with Total Absorption Spectroscopy

Rasco, B. C.; Wolińska-Cichocka, M.; Fijałkowska, A.; Rykaczewski, Krzysztof P.; Karny, Marek; Grzywacz, Robert Kazimierz; Goetz, K. C.; Gross, Carl J.; Stracener, Daniel W.; Zganjar, E. F.; Batchelder, Jon C.; Blackmon, J. C.; Brewer, Nathan T.; Go, S.; Heffron, Blaine; King, T.; Matta, James T.; Miernik, Krzysztof; Nesaraja, Caroline D.; Paulauskas, S. V.; Rajabali, M. M.; Wang, E. H.; Winger, J. A.; Xiao, Y.; Zachary, C. J.

doi:10.1103/PhysRevLett.117.092501

Title: Decays of the Three Top Contributors to the Reactor ${\bar{ν}}_{e}$ High-Energy Spectrum, ${}^{92}{Rb}$ , ${}^{96 gs}Y$ , and ${}^{142}{Cs}$ , Studied with Total Absorption Spectroscopy

Abstract

Here, we report total absorption spectroscopy measurements of ⁹²Rb, ⁹⁶^gsY, and ¹⁴²Cs β decays, which are the most important contributors to the high energy ν¯_e spectral shape in nuclear reactors. These three β decays contribute 43% of the ¯νe flux near 5.5 MeV emitted by nuclear reactors. This ν¯_e energy is particularly interesting due to spectral features recently observed in several experiments including the Daya Bay, Double Chooz, and RENO Collaborations. Measurements were conducted at Oak Ridge National Laboratory by means of proton-induced fission of ²³⁸U with on-line mass separation of fission fragments and the Modular Total Absorption Spectrometer. We observe a β-decay pattern that is similar to recent measurements of ⁹²Rb, with a ground-state to ground-state β feeding of 91(3)%. We verify the ^96gsY ground-state to ground-state β feeding of 95.5(20)%. Our measurements substantially modify the β-decay feedings of ¹⁴²Cs, reducing the β feeding to ¹⁴²Ba states below 2 MeV by 32% when compared with the latest evaluations. Our results increase the discrepancy between the observed and the expected reactor ν¯_e flux between 5 and 7 MeV, the maximum excess increases from ~10% to ~12%.

Authors:

Rasco, B. C. ^[1]; Wolińska-Cichocka, M. ^[2]; Fijałkowska, A. ^[3];

^[4]; Karny, Marek ^[2];

^[5]; Goetz, K. C. ^[6]; Gross, Carl J. ^[4];

^[4]; Zganjar, E. F. ^[7]; Batchelder, Jon C. ^[8]; Blackmon, J. C. ^[7]; Brewer, Nathan T. ^[1]; Go, S. ^[6]; Heffron, Blaine ^[5]; King, T. ^[6];

^[4]; Miernik, Krzysztof ^[2];

^[4]; Paulauskas, S. V. ^[6] more »

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Warsaw, Warsaw (Poland); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Warsaw, Warsaw (Poland); Univ. of Tennessee, Knoxville, 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)
Univ. of Tennessee, Knoxville, TN (United States)
Louisiana State Univ., Baton Rouge, LA (United States)
Univ. of California, Berkeley, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Tennessee Technological Univ., Cookeville, TN (United States)
Vanderbilt Univ., Nashville, TN (United States)
Mississippi State Univ., Mississippi State, MS (United States)

Publication Date:: 2016-08-22

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1491328

Alternate Identifier(s):: OSTI ID: 1328606

Grant/Contract Number:: AC05-00OR22725; FG02-96ER40983; FG02-96ER40978; FG02-96ER41006; FG05-88ER40407 (VU)

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 117; Journal Issue: 9; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Rasco, B. C., Wolińska-Cichocka, M., Fijałkowska, A., Rykaczewski, Krzysztof P., Karny, Marek, Grzywacz, Robert Kazimierz, Goetz, K. C., Gross, Carl J., Stracener, Daniel W., Zganjar, E. F., Batchelder, Jon C., Blackmon, J. C., Brewer, Nathan T., Go, S., Heffron, Blaine, King, T., Matta, James T., Miernik, Krzysztof, Nesaraja, Caroline D., Paulauskas, S. V., Rajabali, M. M., Wang, E. H., Winger, J. A., Xiao, Y., and Zachary, C. J. Decays of the Three Top Contributors to the Reactor ν¯e High-Energy Spectrum, Rb92 , Y96gs , and Cs142 , Studied with Total Absorption Spectroscopy.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevLett.117.092501.

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                    Rasco, B. C., Wolińska-Cichocka, M., Fijałkowska, A., Rykaczewski, Krzysztof P., Karny, Marek, Grzywacz, Robert Kazimierz, Goetz, K. C., Gross, Carl J., Stracener, Daniel W., Zganjar, E. F., Batchelder, Jon C., Blackmon, J. C., Brewer, Nathan T., Go, S., Heffron, Blaine, King, T., Matta, James T., Miernik, Krzysztof, Nesaraja, Caroline D., Paulauskas, S. V., Rajabali, M. M., Wang, E. H., Winger, J. A., Xiao, Y., & Zachary, C. J. Decays of the Three Top Contributors to the Reactor ν¯e High-Energy Spectrum, Rb92 , Y96gs , and Cs142 , Studied with Total Absorption Spectroscopy.  United States.  https://doi.org/10.1103/PhysRevLett.117.092501

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                    Rasco, B. C., Wolińska-Cichocka, M., Fijałkowska, A., Rykaczewski, Krzysztof P., Karny, Marek, Grzywacz, Robert Kazimierz, Goetz, K. C., Gross, Carl J., Stracener, Daniel W., Zganjar, E. F., Batchelder, Jon C., Blackmon, J. C., Brewer, Nathan T., Go, S., Heffron, Blaine, King, T., Matta, James T., Miernik, Krzysztof, Nesaraja, Caroline D., Paulauskas, S. V., Rajabali, M. M., Wang, E. H., Winger, J. A., Xiao, Y., and Zachary, C. J. Mon .  
"Decays of the Three Top Contributors to the Reactor ν¯e High-Energy Spectrum, Rb92 , Y96gs , and Cs142 , Studied with Total Absorption Spectroscopy".  United States.  https://doi.org/10.1103/PhysRevLett.117.092501.  https://www.osti.gov/servlets/purl/1491328.

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@article{osti_1491328,

  title        = {Decays of the Three Top Contributors to the Reactor ν¯e High-Energy Spectrum, Rb92 , Y96gs , and Cs142 , Studied with Total Absorption Spectroscopy},

  author       = {Rasco, B. C. and Wolińska-Cichocka, M. and Fijałkowska, A. and Rykaczewski, Krzysztof P. and Karny, Marek and Grzywacz, Robert Kazimierz and Goetz, K. C. and Gross, Carl J. and Stracener, Daniel W. and Zganjar, E. F. and Batchelder, Jon C. and Blackmon, J. C. and Brewer, Nathan T. and Go, S. and Heffron, Blaine and King, T. and Matta, James T. and Miernik, Krzysztof and Nesaraja, Caroline D. and Paulauskas, S. V. and Rajabali, M. M. and Wang, E. H. and Winger, J. A. and Xiao, Y. and Zachary, C. J.},

  abstractNote = {Here, we report total absorption spectroscopy measurements of 92Rb, 96gsY, and 142Cs β decays, which are the most important contributors to the high energy ν¯e spectral shape in nuclear reactors. These three β decays contribute 43% of the ¯νe flux near 5.5 MeV emitted by nuclear reactors. This ν¯e energy is particularly interesting due to spectral features recently observed in several experiments including the Daya Bay, Double Chooz, and RENO Collaborations. Measurements were conducted at Oak Ridge National Laboratory by means of proton-induced fission of 238U with on-line mass separation of fission fragments and the Modular Total Absorption Spectrometer. We observe a β-decay pattern that is similar to recent measurements of 92Rb, with a ground-state to ground-state β feeding of 91(3)%. We verify the 96gsY ground-state to ground-state β feeding of 95.5(20)%. Our measurements substantially modify the β-decay feedings of 142Cs, reducing the β feeding to 142Ba states below 2 MeV by 32% when compared with the latest evaluations. Our results increase the discrepancy between the observed and the expected reactor ν¯e flux between 5 and 7 MeV, the maximum excess increases from ~10% to ~12%.},

  doi          = {10.1103/PhysRevLett.117.092501},

  journal      = {Physical Review Letters},

  number       = 9,

  volume       = 117,

  place        = {United States},

  year         = {2016},

  month        = {8}

}

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Title: Decays of the Three Top Contributors to the Reactor ν ¯ e High-Energy Spectrum, Rb 92 , Y 96 gs , and Cs 142 , Studied with Total Absorption Spectroscopy

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Citation Formats

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The essential decay of pandemonium: A demonstration of errors in complex beta-decay schemes journal, November 1977

Effects of Fission Yield Data in the Calculation of Antineutrino Spectra for U 235 ( n , fission ) at Thermal and Fast Neutron Energies journal, April 2016

SuN: Summing NaI(Tl) gamma-ray detector for capture reaction measurements journal, March 2013

Spectral Structure of Electron Antineutrinos from Nuclear Reactors journal, January 2015

The nonlinear light output of NaI(Tl) detectors in the Modular Total Absorption Spectrometer journal, July 2015

ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data journal, December 2011

Algorithms for the analysis of -decay total absorption spectra journal, February 2007

Effect of first-forbidden decays on the shape of neutrino spectra journal, February 2015

New Antineutrino Energy Spectra Predictions from the Summation of Beta Decay Branches of the Fission Products journal, November 2012

Possible origins and implications of the shoulder in reactor neutrino spectra journal, August 2015

Geant4 developments and applications journal, February 2006

Observation of Reactor Electron Antineutrinos Disappearance in the RENO Experiment journal, May 2012

Monte Carlo simulation of the response of a large NaI(Tl)total absorption spectrometer for β-decay studies journal, July 1999

Reactor Decay Heat in Pu 239 : Solving the γ Discrepancy in the 4–3000-s Cooling Period journal, November 2010

Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay journal, February 2016

Reactor antineutrino anomaly journal, April 2011

The new case of missing antineutrinos journal, May 2016

Modular Total Absorption Spectrometer at the HRIBF (ORNL, Oak Ridge) journal, June 2014

Strong octupole and dipole collectivity in Zr 96 : Indication for octupole instability in the A =100 mass region journal, September 1990

Systematic Uncertainties in the Analysis of the Reactor Neutrino Anomaly journal, May 2014

Improved measurements of the neutrino mixing angle θ 13 with the Double Chooz detector journal, October 2014

Measurement of β−-decay intensity distributions of several fission-product isotopes using a total absorption γ-ray spectrometer journal, May 1997

Multiple γ Emission of the 137 Xe 2849–2850 keV Levels Studied with the Modular Total Absorption Spectrometer (MTAS) conference, June 2015

Status of radioactive ion beams at the HRIBF journal, May 2003

First-forbidden transitions in the reactor anomaly journal, November 2019

Total absorption γ -ray spectroscopy of the β -delayed neutron emitters Br 87 , Br 88 , and Rb 94 journal, February 2017

Recoil ions from the β decay of Sb 134 confined in a Paul trap journal, March 2018

Revealing fine structure in the antineutrino spectra from a nuclear reactor journal, July 2018

β − decay study of the Mn 66 − Fe 66 − Co 66 − Ni 66 decay chain journal, December 2018

NEOS Data and the Origin of the 5 MeV Bump in the Reactor Antineutrino Spectrum journal, January 2017

Large Impact of the Decay of Niobium Isomers on the Reactor ν ¯ e Summation Calculations journal, January 2019

Fuel-Composition Dependent Reactor Antineutrino Yield at RENO journal, June 2019

Fuel-composition dependent reactor antineutrino yield at RENO text, January 2018

First-forbidden transitions in the reactor anomaly text, January 2019

Title: Decays of the Three Top Contributors to the Reactor ${\bar{ν}}_{e}$ High-Energy Spectrum, ${}^{92}{Rb}$ , ${}^{96 gs}Y$ , and ${}^{142}{Cs}$ , Studied with Total Absorption Spectroscopy

Precise quasielastic neutrino/nucleon cross-section
journal, July 2003

Nuclear Data Sheets for A = 142
journal, August 2011

Determination of antineutrino spectra from nuclear reactors
journal, August 2011

Total Absorption Spectroscopy Study of ${}^{92}{Rb}$ Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape
journal, September 2015

Absolute branching intensities in the decay of ${}^{92}{Rb}$ to ${}^{92}{Sr}$
journal, July 2006

Nuclear Data Sheets for A = 96
journal, November 2008

Nuclear structure insights into reactor antineutrino spectra
journal, January 2015

Meson-exchange enhancement of the first-forbidden ${}^{96}Y^{g}$ ( $0^{-}$ ) $\to^{96}$ ${Zr}^{g}$ ( $0^{+}$ ) β transition: β decay of the low-spin isomer of ${}^{96}Y$
journal, January 1990

Nuclear Data Sheets for A = 92
journal, October 2012

The essential decay of pandemonium: A demonstration of errors in complex beta-decay schemes
journal, November 1977

Effects of Fission Yield Data in the Calculation of Antineutrino Spectra for ${}^{235}U (n, fission)$ at Thermal and Fast Neutron Energies
journal, April 2016

SuN: Summing NaI(Tl) gamma-ray detector for capture reaction measurements
journal, March 2013

Spectral Structure of Electron Antineutrinos from Nuclear Reactors
journal, January 2015

The nonlinear light output of NaI(Tl) detectors in the Modular Total Absorption Spectrometer
journal, July 2015

ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data
journal, December 2011

Algorithms for the analysis of -decay total absorption spectra
journal, February 2007

Effect of first-forbidden decays on the shape of neutrino spectra
journal, February 2015

New Antineutrino Energy Spectra Predictions from the Summation of Beta Decay Branches of the Fission Products
journal, November 2012

Possible origins and implications of the shoulder in reactor neutrino spectra
journal, August 2015

Geant4 developments and applications
journal, February 2006

Observation of Reactor Electron Antineutrinos Disappearance in the RENO Experiment
journal, May 2012

Monte Carlo simulation of the response of a large NaI(Tl)total absorption spectrometer for β-decay studies
journal, July 1999

Reactor Decay Heat in ${}^{239}{Pu}$ : Solving the $γ$ Discrepancy in the 4–3000-s Cooling Period
journal, November 2010

Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay
journal, February 2016

Reactor antineutrino anomaly
journal, April 2011

The new case of missing antineutrinos
journal, May 2016

Modular Total Absorption Spectrometer at the HRIBF (ORNL, Oak Ridge)
journal, June 2014

Strong octupole and dipole collectivity in ${}^{96}{Zr}$ : Indication for octupole instability in the A =100 mass region
journal, September 1990

Systematic Uncertainties in the Analysis of the Reactor Neutrino Anomaly
journal, May 2014

Improved measurements of the neutrino mixing angle θ 13 with the Double Chooz detector
journal, October 2014

Measurement of β−-decay intensity distributions of several fission-product isotopes using a total absorption γ-ray spectrometer
journal, May 1997

Multiple γ Emission of the 137 Xe 2849–2850 keV Levels Studied with the Modular Total Absorption Spectrometer (MTAS)
conference, June 2015

Status of radioactive ion beams at the HRIBF
journal, May 2003

First-forbidden transitions in the reactor anomaly
journal, November 2019

Total absorption $γ$ -ray spectroscopy of the $β$ -delayed neutron emitters ${}^{87}{Br}$ , ${}^{88}{Br}$ , and ${}^{94}{Rb}$
journal, February 2017

Recoil ions from the $β$ decay of ${}^{134}{Sb}$ confined in a Paul trap
journal, March 2018

Revealing fine structure in the antineutrino spectra from a nuclear reactor
journal, July 2018

$β^{-}$ decay study of the ${}^{66}{Mn} − {}^{66}{Fe} − {}^{66}{Co} − {}^{66}{Ni}$ decay chain
journal, December 2018

NEOS Data and the Origin of the 5 MeV Bump in the Reactor Antineutrino Spectrum
journal, January 2017

Large Impact of the Decay of Niobium Isomers on the Reactor ${\bar{ν}}_{e}$ Summation Calculations
journal, January 2019

Fuel-Composition Dependent Reactor Antineutrino Yield at RENO
journal, June 2019

Fuel-composition dependent reactor antineutrino yield at RENO
text, January 2018

First-forbidden transitions in the reactor anomaly
text, January 2019