Revealing Fine Structure in the Antineutrino Spectra from a Nuclear Reactor

Sonzogni, Alejandro A.; Nino, M.; McCutchan, E. A.

doi:10.1103/PhysRevC.98.014323

Title: Revealing Fine Structure in the Antineutrino Spectra from a Nuclear Reactor

Abstract

Here, we calculate the Inverse Beta Decay (IBD) antineutrino spectrum generated by nuclear reactors using the summation method to understand deviations from the smooth Huber-Mueller model due to the decay of individual fission products, showing that plotting the ratio of two adjacent spectra points can effectively reveal these deviations. We obtain that for binning energies of 0.1 MeV or lower, abrupt changes in the spectra due to the jagged nature of the individual antineutrino spectra could be observed for highly precise experiments. Surprisingly, our calculations also reveal a peak-like feature in the adjacent points ratio plot at 4.5 MeV even with a 0.25 MeV binning interval, which we find is present in the IBD spectrum published by Daya Bay in 2016. We show that this 4.5 MeV feature is caused by the contributions of just four fission products, ⁹⁵Y, ^98,101Nb and ¹⁰²T_c. This would be the first evidence of the decay of a few fission products in the IBD antineutrino spectrum from a nuclear reactor. This result is supported by applying the same numerical technique to measured aggregate electron spectra.

Authors:

Sonzogni, Alejandro A. ^[1]; Nino, M. ^[2]; McCutchan, E. A. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Hofstra Univ., Hempstead, NY (United States)

Publication Date:: Fri Jul 20 00:00:00 EDT 2018

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

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

OSTI Identifier:: 1460712

Alternate Identifier(s):: OSTI ID: 1461033

Report Number(s):: BNL-207832-2018-JAAM
Journal ID: ISSN 2469-9985; TRN: US1901905

Grant/Contract Number:: SC0012704; AC02-98CH10886

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 98; Journal Issue: 1; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Sonzogni, Alejandro A., Nino, M., and McCutchan, E. A. Revealing Fine Structure in the Antineutrino Spectra from a Nuclear Reactor.  United States: N. p., 2018. 
Web.  doi:10.1103/PhysRevC.98.014323.

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                    Sonzogni, Alejandro A., Nino, M., & McCutchan, E. A. Revealing Fine Structure in the Antineutrino Spectra from a Nuclear Reactor.  United States.  https://doi.org/10.1103/PhysRevC.98.014323

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                    Sonzogni, Alejandro A., Nino, M., and McCutchan, E. A. Fri .  
"Revealing Fine Structure in the Antineutrino Spectra from a Nuclear Reactor".  United States.  https://doi.org/10.1103/PhysRevC.98.014323.  https://www.osti.gov/servlets/purl/1460712.

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@article{osti_1460712,

  title        = {Revealing Fine Structure in the Antineutrino Spectra from a Nuclear Reactor},

  author       = {Sonzogni, Alejandro A. and Nino, M. and McCutchan, E. A.},

  abstractNote = {Here, we calculate the Inverse Beta Decay (IBD) antineutrino spectrum generated by nuclear reactors using the summation method to understand deviations from the smooth Huber-Mueller model due to the decay of individual fission products, showing that plotting the ratio of two adjacent spectra points can effectively reveal these deviations. We obtain that for binning energies of 0.1 MeV or lower, abrupt changes in the spectra due to the jagged nature of the individual antineutrino spectra could be observed for highly precise experiments. Surprisingly, our calculations also reveal a peak-like feature in the adjacent points ratio plot at 4.5 MeV even with a 0.25 MeV binning interval, which we find is present in the IBD spectrum published by Daya Bay in 2016. We show that this 4.5 MeV feature is caused by the contributions of just four fission products, 95Y, 98,101Nb and 102Tc. This would be the first evidence of the decay of a few fission products in the IBD antineutrino spectrum from a nuclear reactor. This result is supported by applying the same numerical technique to measured aggregate electron spectra.},

  doi          = {10.1103/PhysRevC.98.014323},

  journal      = {Physical Review C},

  number       = 1,

  volume       = 98,

  place        = {United States},

  year         = {Fri Jul 20 00:00:00 EDT 2018},

  month        = {Fri Jul 20 00:00:00 EDT 2018}

}

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https://doi.org/10.1103/PhysRevC.98.014323

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Cited by: 19 works

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Figures / Tables:

Fig. 1: (a) Energy distribution using only the phase space term, (b) energy distribution for electrons including all the correction terms (c) as the middle panel but for antineutrinos.

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Title: Revealing Fine Structure in the Antineutrino Spectra from a Nuclear Reactor

Abstract

Citation Formats

Figures / Tables:

Measurement of the Rate of ν e + d → p + p + e − Interactions Produced by B 8 Solar Neutrinos at the Sudbury Neutrino Observatory journal, July 2001

Sterile Neutrino Search at the NEOS Experiment journal, March 2017

Analysis of the Daya Bay Reactor Antineutrino Flux Changes with Fuel Burnup journal, January 2018

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

Determination of antineutrino spectra from nuclear reactors journal, August 2011

Background radiation measurements at high power research reactors journal, January 2016

Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay journal, June 2017

Observation of Energy and Baseline Dependent Reactor Antineutrino Disappearance in the RENO Experiment journal, May 2016

Determination of the antineutrino spectrum from 235U thermal neutron fission products up to 9.5 MeV journal, October 1985

Nuclear structure insights into reactor antineutrino spectra journal, January 2015

Indication of Reactor ν ¯ e Disappearance in the Double Chooz Experiment journal, March 2012

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

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Nuclear Data Sheets for A = 102 journal, August 2009

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

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Antineutrino spectra from 241Pu and 239Pu thermal neutron fission products journal, February 1989

Experimental beta-spectra from 239Pu and 235U thermal neutron fission products and their correlated antineutrino spectra journal, December 1982

Reactor antineutrino shoulder explained by energy scale nonlinearities? journal, October 2017

Reactor antineutrino spectra and their application to antineutrino-induced reactions. II journal, October 1981

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

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

Detection of the Free Neutrino: a Confirmation journal, July 1956

Dissecting Reactor Antineutrino Flux Calculations journal, September 2017

Online monitoring of the Osiris reactor with the Nucifer neutrino detector journal, June 2016

Antineutrino Monitoring for Heavy Water Reactors journal, July 2014

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Improved predictions of reactor antineutrino spectra journal, May 2011

Reactor antineutrino anomaly journal, April 2011

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

Nuclear Data Sheets for A = 98 journal, February 2003

The PROSPECT physics program journal, October 2016

Total absorption study of the β decay of 102 , 104 , 105 Tc journal, April 2013

New antineutrino energy spectra predictions from the summation of beta decay branches of the fission products text, January 2012

Spectral Structure of Electron Antineutrinos from Nuclear Reactors text, January 2014

Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay text, January 2015

Sterile neutrino search at NEOS Experiment text, January 2016

Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay text, January 2017

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Measurement of the Rate of $ν_{e} + d \to p + p + e^{-}$ Interactions Produced by ${}^{8}B$ Solar Neutrinos at the Sudbury Neutrino Observatory
journal, July 2001

Sterile Neutrino Search at the NEOS Experiment
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Background radiation measurements at high power research reactors
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Observation of Energy and Baseline Dependent Reactor Antineutrino Disappearance in the RENO Experiment
journal, May 2016

Determination of the antineutrino spectrum from 235U thermal neutron fission products up to 9.5 MeV
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journal, December 2011

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
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journal, July 1956

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journal, September 2017

Online monitoring of the Osiris reactor with the Nucifer neutrino detector
journal, June 2016

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Improved predictions of reactor antineutrino spectra
journal, May 2011

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

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