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Article ; Online: Final Measurement of the ^{235}U Antineutrino Energy Spectrum with the PROSPECT-I Detector at HFIR.

Andriamirado, M / Balantekin, A B / Bass, C D / Bergeron, D E / Bernard, E P / Bowden, N S / Bryan, C D / Carr, R / Classen, T / Conant, A J / Deichert, G / Delgado, A / Diwan, M V / Dolinski, M J / Erickson, A / Foust, B T / Gaison, J K / Galindo-Uribari, A / Gilbert, C E /

Gokhale, S / Grant, C / Hans, S / Hansell, A B / Heeger, K M / Heffron, B / Jaffe, D E / Jayakumar, S / Ji, X / Jones, D C / Koblanski, J / Kunkle, P / Kyzylova, O / LaBelle, D / Lane, C E / Langford, T J / LaRosa, J / Littlejohn, B R / Lu, X / Maricic, J / Mendenhall, M P / Meyer, A M / Milincic, R / Mueller, P E / Mumm, H P / Napolitano, J / Neilson, R / Nikkel, J A / Nour, S / Palomino Gallo, J L / Pushin, D A / Qian, X / Roca, C / Rosero, R / Searles, M / Surukuchi, P T / Sutanto, F / Tyra, M A / Venegas-Vargas, D / Weatherly, P B / Wilhelmi, J / Woolverton, A / Yeh, M / Zhang, C / Zhang, X

Physical review letters

2023 Volume 131, Issue 2, Page(s) 21802

Abstract: This Letter reports one of the most precise measurements to date of the antineutrino spectrum from a purely ^{235}U-fueled reactor, made with the final dataset from the PROSPECT-I detector at the High Flux Isotope Reactor. By extracting information from ... ...

Abstract	This Letter reports one of the most precise measurements to date of the antineutrino spectrum from a purely ^{235}U-fueled reactor, made with the final dataset from the PROSPECT-I detector at the High Flux Isotope Reactor. By extracting information from previously unused detector segments, this analysis effectively doubles the statistics of the previous PROSPECT measurement. The reconstructed energy spectrum is unfolded into antineutrino energy and compared with both the Huber-Mueller model and a spectrum from a commercial reactor burning multiple fuel isotopes. A local excess over the model is observed in the 5-7 MeV energy region. Comparison of the PROSPECT results with those from commercial reactors provides new constraints on the origin of this excess, disfavoring at 2.0 and 3.7 standard deviations the hypotheses that antineutrinos from ^{235}U are solely responsible and noncontributors to the excess observed at commercial reactors, respectively.
Language	English
Publishing date	2023-07-28
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.131.021802
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: Final Measurement of the U235 Antineutrino Energy Spectrum with the PROSPECT-I Detector at HFIR

Adriamirado, M. / Balantekin, A. B. / Bass, C. D. / Bergeron, D. E. / Bernard, E. P. / Bowden, N. S. / Bryan, C. D. / Carr, R. / Classen, T. / Conant, A. J. / Deichert, G. / Delgado, A. / Diwan, M. V. / Dolinski, M. J. / Erickson, A. / Foust, B. T. / Gaison, J. K. / Galindo-Uribari, A. / Gilbert, C. E. /

Gokhale, S. / Grant, C. / Hans, S. / Hansell, A. B. / Heeger, K. M. / Heffron, B. / Jaffe, D. E. / Jayakumar, S. / Ji, X. / Jones, D. C. / Koblanski, J. / Kunkle, P. / Kyzylova, O. / LaBelle, D. / Lane, C. E. / Langford, T. J. / LaRosa, J. / Littlejohn, B. R. / Lu, X. / Maricic, J. / Mendenhall, M. P. / Meyer, A. M. / Milincic, R. / Mueller, P. E. / Mumm, H. P. / Napolitano, J. / Neilson, R. / Nikkel, J. A. / Nour, S. / Gallo, J. L. Palomino / Pushin, D. A.

2022

Abstract: This Letter reports one of the most precise measurements to date of the antineutrino spectrum from a purely U235-fueled reactor, made with the final dataset from the PROSPECT-I detector at the High Flux Isotope Reactor. By extracting information from ... ...

Abstract	This Letter reports one of the most precise measurements to date of the antineutrino spectrum from a purely U235-fueled reactor, made with the final dataset from the PROSPECT-I detector at the High Flux Isotope Reactor. By extracting information from previously unused detector segments, this analysis effectively doubles the statistics of the previous PROSPECT measurement. The reconstructed energy spectrum is unfolded into antineutrino energy and compared with both the Huber-Mueller model and a spectrum from a commercial reactor burning multiple fuel isotopes. A local excess over the model is observed in the 5MeV to 7MeV energy region. Comparison of the PROSPECT results with those from commercial reactors provides new constraints on the origin of this excess, disfavoring at 2.2 and 3.2 standard deviations the hypotheses that antineutrinos from U235 are solely responsible and non-contributors to the excess observed at commercial reactors respectively. Comment: The paper has been updated with an improved parametrization of the observed antineutrino spectrum excess and extended discussion on its potential isotopic origin
Keywords	Nuclear Experiment ; High Energy Physics - Experiment
Subject code	660
Publishing date	2022-12-20
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Performance of novel VUV-sensitive Silicon Photo-Multipliers for nEXO

Gallina, G. / Guan, Y. / Retiere, F. / Cao, G. / Bolotnikov, A. / Kotov, I. / Rescia, S. / Soma, A. K. / Tsang, T. / Darroch, L. / Brunner, T. / Bolster, J. / Cohen, J. R. / Franco, T. Pinto / Gillis, W. C. / Smalley, H. Peltz / Thibado, S. / Pocar, A. / Bhat, A. /

Jamil, A. / Moore, D. C. / Adhikari, G. / Kharusi, S. Al / Angelico, E. / Arnquist, I. J. / Arsenault, P. / Badhrees, I. / Bane, J. / Belov, V. / Bernard, E. P. / Bhatta, T. / Brodsky, J. P. / Brown, E. / Caden, E. / Cao, L. / Chambers, C. / Chana, B. / Charlebois, S. A. / Chernyak, D. / Chiu, M. / Cleveland, B. / Collister, R. / Cvitan, M. / Dalmasson, J. / Daniels, T. / Deslandes, K. / DeVoe, R. / di Vacri, M. L. / Ding, Y. / Dolinski, M. J.

2022

Abstract: Liquid xenon time projection chambers are promising detectors to search for neutrinoless double beta decay (0$\nu \beta \beta$), due to their response uniformity, monolithic sensitive volume, scalability to large target masses, and suitability for ... ...

Abstract	Liquid xenon time projection chambers are promising detectors to search for neutrinoless double beta decay (0$\nu \beta \beta$), due to their response uniformity, monolithic sensitive volume, scalability to large target masses, and suitability for extremely low background operations. The nEXO collaboration has designed a tonne-scale time projection chamber that aims to search for 0$\nu \beta \beta$ of \ce{^{136}Xe} with projected half-life sensitivity of $1.35\times 10^{28}$~yr. To reach this sensitivity, the design goal for nEXO is $\leq$1\% energy resolution at the decay $Q$-value ($2458.07\pm 0.31$~keV). Reaching this resolution requires the efficient collection of both the ionization and scintillation produced in the detector. The nEXO design employs Silicon Photo-Multipliers (SiPMs) to detect the vacuum ultra-violet, 175 nm scintillation light of liquid xenon. This paper reports on the characterization of the newest vacuum ultra-violet sensitive Fondazione Bruno Kessler VUVHD3 SiPMs specifically designed for nEXO, as well as new measurements on new test samples of previously characterised Hamamatsu VUV4 Multi Pixel Photon Counters (MPPCs). Various SiPM and MPPC parameters, such as dark noise, gain, direct crosstalk, correlated avalanches and photon detection efficiency were measured as a function of the applied over voltage and wavelength at liquid xenon temperature (163~K). The results from this study are used to provide updated estimates of the achievable energy resolution at the decay $Q$-value for the nEXO design.
Keywords	Physics - Instrumentation and Detectors
Subject code	621
Publishing date	2022-09-16
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Joint Measurement of the ^{235}U Antineutrino Spectrum by PROSPECT and STEREO.

Almazán, H / Andriamirado, M / Balantekin, A B / Band, H R / Bass, C D / Bergeron, D E / Bernard, L / Blanchet, A / Bonhomme, A / Bowden, N S / Bryan, C D / Buck, C / Classen, T / Conant, A J / Deichert, G / Del Amo Sanchez, P / Delgado, A / Diwan, M V / Dolinski, M J /

El Atmani, I / Erickson, A / Foust, B T / Gaison, J K / Galindo-Uribarri, A / Gilbert, C E / Hans, S / Hansell, A B / Heeger, K M / Heffron, B / Jaffe, D E / Jayakumar, S / Ji, X / Jones, D C / Koblanski, J / Kyzylova, O / Labit, L / Lamblin, J / Lane, C E / Langford, T J / LaRosa, J / Letourneau, A / Lhuillier, D / Licciardi, M / Lindner, M / Littlejohn, B R / Lu, X / Maricic, J / Materna, T / Mendenhall, M P / Meyer, A M / Milincic, R / Mueller, P E / Mumm, H P / Napolitano, J / Neilson, R / Nikkel, J A / Nour, S / Palomino, J L / Pessard, H / Pushin, D A / Qian, X / Réal, J-S / Ricol, J-S / Roca, C / Rogly, R / Rosero, R / Salagnac, T / Savu, V / Schoppmann, S / Searles, M / Sergeyeva, V / Soldner, T / Stutz, A / Surukuchi, P T / Tyra, M A / Varner, R L / Venegas-Vargas, D / Vialat, M / Weatherly, P B / White, C / Wilhelmi, J / Woolverton, A / Yeh, M / Zhang, C / Zhang, X

Physical review letters

2022 Volume 128, Issue 8, Page(s) 81802

Abstract: The PROSPECT and STEREO collaborations present a combined measurement of the pure ^{235}U antineutrino spectrum, without site specific corrections or detector-dependent effects. The spectral measurements of the two highest precision experiments at ... ...

Abstract	The PROSPECT and STEREO collaborations present a combined measurement of the pure ^{235}U antineutrino spectrum, without site specific corrections or detector-dependent effects. The spectral measurements of the two highest precision experiments at research reactors are found to be compatible with χ^{2}/ndf=24.1/21, allowing a joint unfolding of the prompt energy measurements into antineutrino energy. This ν[over ¯]_{e} energy spectrum is provided to the community, and an excess of events relative to the Huber model is found in the 5-6 MeV region. When a Gaussian bump is fitted to the excess, the data-model χ^{2} value is improved, corresponding to a 2.4σ significance.
Language	English
Publishing date	2022-03-11
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.128.081802
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: PROSPECT-II Physics Opportunities

Andriamirado, M. / Balantekin, A. B. / Band, H. R. / Bass, C. D. / Bergeron, D. E. / Bowden, N. S. / Bryan, C. D. / Carr, R. / Classen, T. / Conant, A. J. / Deichert, G. / Delgado, A. / Diwan, M. V. / Dolinski, M. J. / Erickson, A. / Foust, B. T. / Gaison, J. K. / Galindo-Uribari, A. / Gilbert, C. E. /

Grant, C. / Hans, S. / Hansell, A. B. / Heeger, K. M. / Heffron, B. / Jaffe, D. E. / Jayakumar, S. / Ji, X. / Jones, D. C. / Koblanski, J. / Kunkle, P. / Kyzylova, O. / Lane, C. E. / Langford, T. J. / LaRosa, J. / Littlejohn, B. R. / Lu, X. / Maricic, J. / Mendenhall, M. P. / Meyer, A. M. / Milincic, R. / Mueller, P. E. / Mumm, H. P. / Napolitano, J. / Neilson, R. / Nikkel, J. A. / Nour, S. / Palomino, J. L. / Pushin, D. A. / Qian, X. / Rosero, R.

2021

Abstract: The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, has made world-leading measurements of reactor antineutrinos at short baselines. In its first phase, conducted at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory, ... ...

Abstract	The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, has made world-leading measurements of reactor antineutrinos at short baselines. In its first phase, conducted at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory, PROSPECT produced some of the strongest limits on eV-scale sterile neutrinos, made a precision measurement of the reactor antineutrino spectrum from $^{235}$U, and demonstrated the observation of reactor antineutrinos in an aboveground detector with good energy resolution and well-controlled backgrounds. The PROSPECT collaboration is now preparing an upgraded detector, PROSPECT-II, to probe yet unexplored parameter space for sterile neutrinos and contribute to a full resolution of the Reactor Antineutrino Anomaly, a longstanding puzzle in neutrino physics. By pressing forward on the world's most precise measurement of the $^{235}$U antineutrino spectrum and measuring the absolute flux of antineutrinos from $^{235}$U, PROSPECT-II will sharpen a tool with potential value for basic neutrino science, nuclear data validation, and nuclear security applications. Following a two-year deployment at HFIR, an additional PROSPECT-II deployment at a low enriched uranium reactor could make complementary measurements of the neutrino yield from other fission isotopes. PROSPECT-II provides a unique opportunity to continue the study of reactor antineutrinos at short baselines, taking advantage of demonstrated elements of the original PROSPECT design and close access to a highly enriched uranium reactor core.
Keywords	High Energy Physics - Experiment ; Nuclear Experiment ; Physics - Instrumentation and Detectors
Subject code	660
Publishing date	2021-07-08
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Generative Adversarial Networks for Scintillation Signal Simulation in EXO-200

Li, S. / Ostrovskiy, I. / Li, Z. / Yang, L. / Kharusi, S. Al / Anton, G. / Badhrees, I. / Barbeau, P. S. / Beck, D. / Belov, V. / Bhatta, T. / Breidenbach, M. / Brunner, T. / Cao, G. F. / Cen, W. R. / Chambers, C. / Cleveland, B. / Coon, M. / Craycraft, A. /

Daniels, T. / Darroch, L. / Daugherty, S. J. / Davis, J. / Delaquis, S. / Der Mesrobian-Kabakian, A. / DeVoe, R. / Dilling, J. / Dolgolenko, A. / Dolinski, M. J. / Echevers, J. / Fairbank Jr., W. / Fairbank, D. / Farine, J. / Feyzbakhsh, S. / Fierlinger, P. / Fu, Y. S. / Fudenberg, D. / Gautam, P. / Gornea, R. / Gratta, G. / Hall, C. / Hansen, E. V. / Hoessl, J. / Hufschmidt, P. / Hughes, M. / Iverson, A. / Jamil, A. / Jessiman, C. / Jewell, M. J. / Johnson, A. / Karelin, A. / Kaufman, L. J. / Koffas, T. / Krücken, R. / Kuchenkov, A. / Kumar, K. S. / Lan, Y. / Larson, A. / Lenardo, B. G. / Leonard, D. S. / Li, G. S. / Licciardi, C. / Lin, Y. H. / MacLellan, R. / McElroy, T. / Michel, T. / Mong, B. / Moore, D. C. / Murray, K. / Njoya, O. / Nusair, O. / Odian, A. / Perna, A. / Piepke, A. / Pocar, A. / Retière, F. / Robinson, A. L. / Rowson, P. C. / Runge, J. / Schmidt, S. / Sinclair, D. / Skarpaas, K. / Soma, A. K. / Stekhanov, V. / Tarka, M. / Thibado, S. / Todd, J. / Tolba, T. / Totev, T. I. / Tsang, R.

2023

Abstract: Generative Adversarial Networks trained on samples of simulated or actual events have been proposed as a way of generating large simulated datasets at a reduced computational cost. In this work, a novel approach to perform the simulation of photodetector ...

Abstract	Generative Adversarial Networks trained on samples of simulated or actual events have been proposed as a way of generating large simulated datasets at a reduced computational cost. In this work, a novel approach to perform the simulation of photodetector signals from the time projection chamber of the EXO-200 experiment is demonstrated. The method is based on a Wasserstein Generative Adversarial Network - a deep learning technique allowing for implicit non-parametric estimation of the population distribution for a given set of objects. Our network is trained on real calibration data using raw scintillation waveforms as input. We find that it is able to produce high-quality simulated waveforms an order of magnitude faster than the traditional simulation approach and, importantly, generalize from the training sample and discern salient high-level features of the data. In particular, the network correctly deduces position dependency of scintillation light response in the detector and correctly recognizes dead photodetector channels. The network output is then integrated into the EXO-200 analysis framework to show that the standard EXO-200 reconstruction routine processes the simulated waveforms to produce energy distributions comparable to that of real waveforms. Finally, the remaining discrepancies and potential ways to improve the approach further are highlighted. Comment: As accepted by JINST
Keywords	High Energy Physics - Experiment ; Computer Science - Machine Learning ; Physics - Instrumentation and Detectors
Subject code	006
Publishing date	2023-03-11
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Nonfuel Antineutrino Contributions in the High Flux Isotope Reactor.

Balantekin, A B / Band, H R / Bass, C D / Bergeron, D E / Berish, D / Bowden, N S / Brodsky, J P / Bryan, C D / Classen, T / Conant, A J / Deichert, G / Diwan, M V / Dolinski, M J / Erickson, A / Foust, B T / Gaison, J K / Galindo-Uribarri, A / Gilbert, C E / Hackett, B T /

Hans, S / Hansell, A B / Heeger, K M / Heffron, B / Jaffe, D E / Ji, X / Jones, D C / Kyzylova, O / Lane, C E / Langford, T J / LaRosa, J / Littlejohn, B R / Lu, X / Maricic, J / Mendenhall, M P / Milincic, R / Mitchell, I / Mueller, P E / Mumm, H P / Napolitano, J / Neilson, R / Nikkel, J A / Norcini, D / Nour, S / Palomino-Gallo, J L / Pushin, D A / Qian, X / Romero-Romero, E / Rosero, R / Surukuchi, P T / Tyra, M A / Varner, R L / White, C / Wilhelmi, J / Woolverton, A / Yeh, M / Zhang, A / Zhang, C / Zhang, X

Physical review. C

2020 Volume 101

Abstract: Reactor neutrino experiments have seen major improvements in precision in recent years. With the experimental uncertainties becoming lower than those from theory, carefully considering all sources ... ...

Abstract	Reactor neutrino experiments have seen major improvements in precision in recent years. With the experimental uncertainties becoming lower than those from theory, carefully considering all sources of
Language	English
Publishing date	2020-11-26
Publishing country	United States
Document type	Journal Article
ZDB-ID	2844098-5
ISSN	2469-9993 ; 2469-9985
ISSN (online)	2469-9993
ISSN	2469-9985
DOI	10.1103/PhysRevC.101.054605
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Measurement of the Antineutrino Spectrum from ^{235}U Fission at HFIR with PROSPECT.

Ashenfelter, J / Balantekin, A B / Band, H R / Bass, C D / Bergeron, D E / Berish, D / Bowden, N S / Brodsky, J P / Bryan, C D / Cherwinka, J J / Classen, T / Conant, A J / Cox, A A / Davee, D / Dean, D / Deichert, G / Diwan, M V / Dolinski, M J / Erickson, A /

Febbraro, M / Foust, B T / Gaison, J K / Galindo-Uribarri, A / Gilbert, C E / Gilje, K E / Hackett, B T / Hans, S / Hansell, A B / Heeger, K M / Insler, J / Jaffe, D E / Ji, X / Jones, D C / Kyzylova, O / Lane, C E / Langford, T J / LaRosa, J / Littlejohn, B R / Lu, X / Martinez Caicedo, D A / Matta, J T / McKeown, R D / Mendenhall, M P / Minock, J M / Mueller, P E / Mumm, H P / Napolitano, J / Neilson, R / Nikkel, J A / Norcini, D / Nour, S / Pushin, D A / Qian, X / Romero-Romero, E / Rosero, R / Sarenac, D / Surukuchi, P T / Telles, A B / Tyra, M A / Varner, R L / Viren, B / White, C / Wilhelmi, J / Wise, T / Yeh, M / Yen, Y-R / Zhang, A / Zhang, C / Zhang, X

Physical review letters

2019 Volume 122, Issue 25, Page(s) 251801

Abstract: This Letter reports the first measurement of the ^{235}U ν[over ¯]_{e} energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85 MW_{th} highly enriched uranium (HEU) High Flux Isotope Reactor. ... ...

Abstract	This Letter reports the first measurement of the ^{235}U ν[over ¯]_{e} energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85 MW_{th} highly enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678±304(stat) ν[over ¯]_{e}-induced inverse beta decays, the largest sample from HEU fission to date, 99% of which are attributed to ^{235}U. Despite broad agreement, comparison of the Huber ^{235}U model to the measured spectrum produces a χ^{2}/ndf=51.4/31, driven primarily by deviations in two localized energy regions. The measured ^{235}U spectrum shape is consistent with a deviation relative to prediction equal in size to that observed at low-enriched uranium power reactors in the ν[over ¯]_{e} energy region of 5-7 MeV.
Language	English
Publishing date	2019-07-04
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.122.251801
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Book ; Online: Nonfuel Antineutrino Contributions in the High Flux Isotope Reactor

Balantekin, A. B. / Band, H. R. / Bass, C. D. / Bergeron, D. E. / Berish, D. / Bowden, N. S. / Brodsky, J. P. / Bryan, C. D. / Classen, T. / Conant, A. J. / Deichert, G. / Diwan, M. V. / Dolinski, M. J. / Erickson, A. / Foust, B. T. / Gaison, J. K. / Galindo-Uribarri, A. / Gilbert, C. E. / Hans, B. T. Hackett S. /

Hansell, A. B. / Heeger, K. M. / Jaffe, B. Heffron D. E. / Ji, X. / Jones, D. C. / Kyzylova, O. / Lane, C. E. / Langford, T. J. / LaRosa, J. / Littlejohn, B. R. / Lu, X. / Maricic, J. / Mendenhall, M. P. / Milincic, R. / Mitchell, I. / Mueller, P. E. / Mumm, H. P. / Napolitano, J. / Neilson, R. / Nikkel, J. A. / Norcini, D. / Nour, S. / Palomino-Gallo, J. L. / Pushin, D. A. / Qian, X. / Romero-Romero, E. / Rosero, R. / Surukuchi, P. T. / Tyra, M. A. / Varner, R. L. / White, C. / Wilhelmi, J. / Woolverton, A. / Yeh, M. / Zhang, A. / Zhang, C. / Zhang, X.

2020

Abstract	Reactor neutrino experiments have seen major improvements in precision in recent years. With the experimental uncertainties becoming lower than those from theory, carefully considering all sources of $\overline{\nu}_{e}$ is important when making theoretical predictions. One source of $\overline{\nu}_{e}$ that is often neglected arises from the irradiation of the nonfuel materials in reactors. The $\overline{\nu}_{e}$ rates and energies from these sources vary widely based on the reactor type, configuration, and sampling stage during the reactor cycle and have to be carefully considered for each experiment independently. In this article, we present a formalism for selecting the possible $\overline{\nu}_{e}$ sources arising from the neutron captures on reactor and target materials. We apply this formalism to the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory, the $\overline{\nu}_{e}$ source for the the Precision Reactor Oscillation and Spectrum Measurement (PROSPECT) experiment. Overall, we observe that the nonfuel $\overline{\nu}_{e}$ contributions from HFIR to PROSPECT amount to 1\% above the inverse beta decay threshold with a maximum contribution of 9\% in the 1.8--2.0~MeV range. Nonfuel contributions can be particularly high for research reactors like HFIR because of the choice of structural and reflector material in addition to the intentional irradiation of target material for isotope production. We show that typical commercial pressurized water reactors fueled with low-enriched uranium will have significantly smaller nonfuel $\overline{\nu}_{e}$ contribution.
Keywords	Nuclear Experiment ; High Energy Physics - Experiment
Subject code	660
Publishing date	2020-03-27
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: First Search for Short-Baseline Neutrino Oscillations at HFIR with PROSPECT.

Ashenfelter, J / Balantekin, A B / Baldenegro, C / Band, H R / Bass, C D / Bergeron, D E / Berish, D / Bignell, L J / Bowden, N S / Bricco, J / Brodsky, J P / Bryan, C D / Bykadorova Telles, A / Cherwinka, J J / Classen, T / Commeford, K / Conant, A J / Cox, A A / Davee, D /

Dean, D / Deichert, G / Diwan, M V / Dolinski, M J / Erickson, A / Febbraro, M / Foust, B T / Gaison, J K / Galindo-Uribarri, A / Gilbert, C E / Gilje, K E / Glenn, A / Goddard, B W / Hackett, B T / Han, K / Hans, S / Hansell, A B / Heeger, K M / Heffron, B / Insler, J / Jaffe, D E / Ji, X / Jones, D C / Koehler, K / Kyzylova, O / Lane, C E / Langford, T J / LaRosa, J / Littlejohn, B R / Lopez, F / Lu, X / Martinez Caicedo, D A / Matta, J T / McKeown, R D / Mendenhall, M P / Miller, H J / Minock, J M / Mueller, P E / Mumm, H P / Napolitano, J / Neilson, R / Nikkel, J A / Norcini, D / Nour, S / Pushin, D A / Qian, X / Romero-Romero, E / Rosero, R / Sarenac, D / Seilhan, B S / Sharma, R / Surukuchi, P T / Trinh, C / Tyra, M A / Varner, R L / Viren, B / Wagner, J M / Wang, W / White, B / White, C / Wilhelmi, J / Wise, T / Yao, H / Yeh, M / Yen, Y-R / Zhang, A / Zhang, C / Zhang, X / Zhao, M

Physical review letters

2019 Volume 121, Issue 25, Page(s) 251802

Abstract: This Letter reports the first scientific results from the observation of antineutrinos emitted by fission products of ^{235}U at the High Flux Isotope Reactor. PROSPECT, the Precision Reactor Oscillation and Spectrum Experiment, consists of a segmented 4 ...

Abstract	This Letter reports the first scientific results from the observation of antineutrinos emitted by fission products of ^{235}U at the High Flux Isotope Reactor. PROSPECT, the Precision Reactor Oscillation and Spectrum Experiment, consists of a segmented 4 ton ^{6}Li-doped liquid scintillator detector covering a baseline range of 7-9 m from the reactor and operating under less than 1 m water equivalent overburden. Data collected during 33 live days of reactor operation at a nominal power of 85 MW yield a detection of 25 461±283 (stat) inverse beta decays. Observation of reactor antineutrinos can be achieved in PROSPECT at 5σ statistical significance within 2 h of on-surface reactor-on data taking. A reactor model independent analysis of the inverse beta decay prompt energy spectrum as a function of baseline constrains significant portions of the previously allowed sterile neutrino oscillation parameter space at 95% confidence level and disfavors the best fit of the reactor antineutrino anomaly at 2.2σ confidence level.
Language	English
Publishing date	2019-01-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.121.251802
Database	MEDical Literature Analysis and Retrieval System OnLINE

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