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492 results on '"Bowden, N."'

1. Remeasurement of the $^{239}$Pu(n,f)/$^{235}$U(n,f) Cross-Section Ratio with the NIFFTE fission Time Projection Chamber Using Vapor-deposited Targets

Author

Dongwi, D. H., Snyder, L., Aguilar, V., Androski, N., Anastasiou, M., Bowden, N. S., Chemey, A., Classen, T., Alencar, J. E. Fuzaro, Greife, U., Haseman, M., Isenhower, L. D., Klay, J. L., Loveland, W., Mendenhall, M. P., Monterial, M., Silveira, M., Prokop, C., Watson, T. S., and Yao, L.

Subjects
Nuclear Experiment
Abstract

The NIFFTE fission Time Projection Chamber (fissionTPC) has been used to measure the $^{239}$Pu(n,f)/$^{235}$U(n,f) cross-section ratio for neutron-induced fission in the range of 0.1 - 100 MeV, with high precision. A white neutron source was provided by the Los Alamos Neutron Science Center, where the experiment was conducted as a remeasurement to evaluate a roughly 2% discrepancy of the previous fissionTPC results with ENDF/B-VIII.0. A detailed accounting of measurement uncertainties was performed, based on the fissionTPC's novel ability to provide three-dimensional reconstruction of fission-fragment ionization profiles. Current results obtained using a vapor-deposited, highly uniform $^{239}$Pu target, in comparison to the measurement published in 2021, where a $^{239}$Pu electroplated target was used, are presented and discussed. The remeasurement presented here is in agreement with the previous fissionTPC result within measurement uncertainties.

Published
2024

2. Final Search for Short-Baseline Neutrino Oscillations with the PROSPECT-I Detector at HFIR

Author

Andriamirado, M., Balantekin, B., Bass, C. D., Rodrigues, O. Benevides, Bernard, E. P., Bowden, N. S., Bryan, C. D., Carr, R., Classen, T., Conant, A. J., Deichert, G., Dolinski, M. J., Erickson, A., Galindo-Uribarri, A., Gokhale, S., Grant, C., Hans, S., Hansell, A. B., Heeger, K. M., Heffron, B., Jaffe, D. E., Jayakumar, S., Koblanski, J. R., Kunkle, P., Lane, C. E., Littlejohn, B. R., Sanchez, A. Lozano, Lu, X., Machado, F., Maricic, J., Mendenhall, M. P., Meyer, A. M., Milincic, R., Mueller, P. E., Mumm, H., Neilson, R., Qian, X., Roca, C., Rosero, R., Surukuchi, P., Sutanto, F., Venegas-Vargas, D., Weatherly, P. B., Wilhelmi, J., Yeh, M., Zhang, C., and Zhang, X.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

The PROSPECT experiment is designed to perform precise searches for antineutrino disappearance at short distances (7 - 9~m) from compact nuclear reactor cores. This Letter reports results from a new neutrino oscillation analysis performed using the complete data sample from the PROSPECT-I detector operated at the High Flux Isotope Reactor in 2018. The analysis uses a multi-period selection of inverse beta decay neutrino interactions with reduced backgrounds and enhanced statistical power to set limits on electron-flavor disappearance caused by mixing with sterile neutrinos with 0.2 - 20 eV$^2$ mass splittings. Inverse beta decay positron energy spectra from six different reactor-detector distance ranges are found to be statistically consistent with one another, as would be expected in the absence of sterile neutrino oscillations. The data excludes at 95% confidence level the existence of sterile neutrinos in regions above 3~eV$^2$ previously unexplored by terrestrial experiments, including all space below 10~eV$^2$ suggested by the recently strengthened Gallium Anomaly. The best-fit point of the Neutrino-4 reactor experiment's claimed observation of short-baseline oscillation is ruled out at more than five standard deviations., Comment: 6 pages, 4 figures

Published
2024

3. Reactor Antineutrino Directionality Measurement with the PROSPECT-I Detector

Author

Andriamirado, M., Balantekin, B., Bass, C. D., Rodrigues, O. Benevides, Bernard, E. P., Bowden, N. S., Bryan, C. D., Carr, R., Classen, T., Conant, A. J., Deichert, G., Dolinski, M. J., Erickson, A., Galindo-Uribarri, A., Gokhale, S., Grant, C., Hans, S., Hansell, A. B., Heeger, K. M., Heffron, B., Jaffe, D. E., Jayakumar, S., Jones, D. C., Koblanski, J. R., Kunkle, P., Lane, C. E., Littlejohn, B. R., Sanchez, A. Lozano, Lu, X., Maricic, J., Mendenhall, M. P., Meyer, A. M., Milincic, R., Mueller, P. E., Mumm, H., Napolitano, J., Nave, C., Neilson, R., Oueslati, M., Roca, C., Rosero, R., Surukuchi, P., Sutanto, F., Venegas-Vargas, D., Weatherly, P. B., Wilhelmi, J., Yeh, M., Zhang, C., and Zhang, X.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

The PROSPECT-I detector has several features that enable measurement of the direction of a compact neutrino source. In this paper, a detailed report on the directional measurements made on electron antineutrinos emitted from the High Flux Isotope Reactor is presented. With an estimated true neutrino (reactor to detector) direction of $\phi = 40.8\unicode{xB0} \pm 0.7\unicode{xB0}$ and $\theta = 98.6\unicode{xB0} \pm 0.4\unicode{xB0}$, the PROSPECT-I detector is able to reconstruct an average neutrino direction of $\phi = 39.4\unicode{xB0} \pm 2.9\unicode{xB0}$ and $\theta = 97.6\unicode{xB0} \pm 1.6\unicode{xB0}$. This measurement is made with approximately 48000 Inverse Beta Decay signal events and is the most precise directional reconstruction of reactor antineutrinos to date.

Published
2024

4. Performance of large-scale 6Li-doped pulse-shape discriminating plastic scintillators

Author

Roca, C., Bowden, N. S., Carman, L., Dazeley, S. A., Durham, S. R., Falana, O. M., Ford, M. J., Glenn, A. M., Hurlbut, C., Li, V. A., Mendenhall, M. P., Shipp, K., Sutanto, F., and Zaitseva, N. P.

Subjects
Physics - Instrumentation and Detectors
Abstract

A $^6$Li-doped plastic scintillator with pulse-shape discrimination capabilities, commercially identified as EJ-299-50, has been developed and produced at the kilogram-scale. A total of 44 kg-scale bars of dimensions 5.5 cm $\times$ 5.5 cm $\times$ 50 cm of this material have been characterized. Optical properties like light output and effective attenuation length have been found to be comparable to $^6$Li-doped liquid scintillators. The scintillator EJ-299-50 shows good neutron detection capabilities with an effective efficiency for capture on $^6$Li of approximately 85%. Stability tests performed on two formulation variations showed no intrinsic degradation in the material or optical properties during several months of observations.

Published
2024

5. $^6$Li-loaded liquid scintillators produced by direct dissolution of compounds in diisopropylnaphthalene (DIPN)

Author

Zaitseva, N. P., Carman, M. L., Ford, M. J., Glenn, A. M., Roca, C., Durham, S., Sutanto, F., Dazeley, S. A., and Bowden, N. S.

Subjects
Physics - Instrumentation and Detectors
Abstract

The paper describes preparation of $^6$Li-loaded liquid scintillators by methods involving direct dissolution of $^6$Li salts in the commercial diisopropylnaphthalene (DIPN) solvent, without the formation of water-in-oil emulsions. Methods include incorporation of $^6$Li that, unlike previously reported formulations, does not require additions of water or a strong acid such as hydrochloric acid (HCl). Results of the conducted experiments show that dissolution of aromatic and aliphatic $^6$Li salts in DIPN can be easily achieved at 0.1- 0.3% by weight of atomic $^6$Li, using small additions of waterless surfactants, or mild carboxylic acids. An alternative way suggests incorporation of $^6$Li as a part of a surfactant molecule that can be dissolved in DIPN without any solubilizing additions. Proposed methods enable preparation of efficient $^6$Li-loaded liquid scintillators that, at a large scale of 50 cm, exhibit good pulse shape discrimination (PSD) properties combined with up to 107% of light output and up to 115% of the attenuation length measured relative to standard undoped EJ-309 liquid scintillator., Comment: Accepted for Nuclear Instruments and Methods in Physics Research A

Published
2023
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6. Final Measurement of the U235 Antineutrino Energy Spectrum with the PROSPECT-I Detector at HFIR

Author

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., 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., and Zhang, X.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
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 to match publication at PRL

Published
2022
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7. Calibration strategy of the PROSPECT-II detector with external and intrinsic sources

Author

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., Delgado, A., Diwan, M. V., Dolinski, M. J., Erickson, A., Foust, B. T., Gaison, J. K., Galindo-Uribarri, 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., 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., 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., and Zhang, X.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract

This paper presents an energy calibration scheme for an upgraded reactor antineutrino detector for the Precision Reactor Oscillation and Spectrum Experiment (PROSPECT). The PROSPECT collaboration is preparing an upgraded detector, PROSPECT-II (P-II), to advance capabilities for the investigation of fundamental neutrino physics, fission processes and associated reactor neutrino flux, and nuclear security applications. P-II will expand the statistical power of the original PROSPECT (P-I) dataset by at least an order of magnitude. The new design builds upon previous P-I design and focuses on improving the detector robustness and long-term stability to enable multi-year operation at one or more sites. The new design optimizes the fiducial volume by elimination of dead space previously occupied by internal calibration channels, which in turn necessitates the external deployment. In this paper, we describe a calibration strategy for P-II. The expected performance of externally deployed calibration sources is evaluated using P-I data and a well-benchmarked simulation package by varying detector segmentation configurations in the analysis. The proposed external calibration scheme delivers a compatible energy scale model and achieves comparable performance with the inclusion of an additional AmBe neutron source, in comparison to the previous internal arrangement. Most importantly, the estimated uncertainty contribution from the external energy scale calibration model meets the precision requirements of the P-II experiment., Comment: 19 pages, 10 figures

Published
2022
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8. Report of the Topical Group on Neutrino Applications for Snowmass 2021

Author

Bowden, N. S., Link, J. M., and Wang, W.

Subjects
High Energy Physics - Experiment, Physics - Physics and Society
Abstract

This report has been prepared as part of the US Community Study on the Future of Particle Physics (Snowmass 2021) by the Snowmass Neutrino Frontier Topical Group NF07 Conveners, based on input from contributed White papers and Letters of Interest., Comment: Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021); Topical Group Report for NF07 (Neutrino Frontier Topical Group on Applications)

Published
2022

9. White Paper on Light Sterile Neutrino Searches and Related Phenomenology

Author

Acero, M. A., Argüelles, C. A., Hostert, M., Kalra, D., Karagiorgi, G., Kelly, K. J., Littlejohn, B., Machado, P., Pettus, W., Toups, M., Ross-Lonergan, M., Sousa, A., Surukuchi, P. T., Wong, Y. Y. Y., Abdallah, W., Abdullahi, A. M., Akutsu, R., Alvarez-Ruso, L., Alves, D. S. M., Aurisano, A., Balantekin, A. B., Berryman, J. M., Bertólez-Martínez, T., Brunner, J., Blennow, M., Bolognesi, S., Borusinski, M., Cianci, D., Collin, G., Conrad, J. M., Crow, B., Denton, P. B., Duvall, M., Fernández-Martinez, E., Fong, C. S., Foppiani, N., Forero, D. V., Friend, M., García-Soto, A., Giganti, C., Giunti, C., Gandhi, R., Ghosh, M., Hardin, J., Heeger, K. M., Ishitsuka, M., Izmaylov, A., Jones, B. J. P., Jordan, J. R., Kamp, N. W., Katori, T., Kim, S. B., Koerner, L. W., Lamoureux, M., Lasserre, T., Leach, K. G., Learned, J., Li, Y. F., Link, J. M., Louis, W. C., Mahn, K., Meyers, P. D., Maricic, J., Marko, D., Maruyama, T., Mertens, S., Minakata, H., Mocioiu, I., Mooney, M., Moulai, M. H., Nunokawa, H., Ochoa-Ricoux, J. P., Oh, Y. M., Ohlsson, T., Päs, H., Pershey, D., Robertson, R. G. H., Rosauro-Alcaraz, S., Rott, C., Roy, S., Salvado, J., Scott, M., Seo, S. H., Shaevitz, M. H., Smiley, M., Spitz, J., Stachurska, J., Thakore, T., Ternes, C. A., Thompson, A., Tseng, S., Vogelaar, B., Weiss, T., Wendell, R. A., Wright, T., Xin, Z., Yang, B. S., Yoo, J., Zennamo, J., Zettlemoyer, J., Zornoza, J. D., Ahmad, S., Basto-Gonzalez, V. S., Bowden, N. S., Cañas, B. C., Caratelli, D., Chang, C. V., Chen, C., Classen, T., Convery, M., Davies, G. S., Dennis, S. R., Djurcic, Z., Dorrill, R., Du, Y., Evans, J. J., Fahrendholz, U., Formaggio, J. A., Foust, B. T., Gatti, H. Frandini, Garcia-Gamez, D., Gariazzo, S., Gehrlein, J., Grant, C., Gomes, R. A., Hansell, A. B., Halzen, F., Ho, S., Zink, J. Hoefken, Jones, R. S., Kunkle, P., Li, J. -Y., Li, S. C., Luo, X., Malyshkin, Yu., Massaro, D., Mastbaum, A., Mohanta, R., Mumm, H. P., Nebot-Guinot, M., Neilson, R., Ni, K., Nieves, J., Gann, G. D. Orebi, Pandey, V., Pascoli, S., Qian, X., Rajaoalisoa, M., Roca, C., Roskovec, B., Saul-Sala, E., Saldaña, L., Scholberg, K., Shakya, B., Slocum, P. L., Snider, E. L., Steiger, H. Th. J., Steklain, A. F., Stock, M. R., Sutanto, F., Takhistov, V., Tsai, Y. -D., Tsai, Y. -T., Venegas-Vargas, D., Wallbank, M., Wang, E., Weatherly, P., Westerdale, S., Worcester, E., Wu, W., Yang, G., and Zamorano, B.

Subjects
High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
Abstract

This white paper provides a comprehensive review of our present understanding of experimental neutrino anomalies that remain unresolved, charting the progress achieved over the last decade at the experimental and phenomenological level, and sets the stage for future programmatic prospects in addressing those anomalies. It is purposed to serve as a guiding and motivational "encyclopedic" reference, with emphasis on needs and options for future exploration that may lead to the ultimate resolution of the anomalies. We see the main experimental, analysis, and theory-driven thrusts that will be essential to achieving this goal being: 1) Cover all anomaly sectors -- given the unresolved nature of all four canonical anomalies, it is imperative to support all pillars of a diverse experimental portfolio, source, reactor, decay-at-rest, decay-in-flight, and other methods/sources, to provide complementary probes of and increased precision for new physics explanations; 2) Pursue diverse signatures -- it is imperative that experiments make design and analysis choices that maximize sensitivity to as broad an array of these potential new physics signatures as possible; 3) Deepen theoretical engagement -- priority in the theory community should be placed on development of standard and beyond standard models relevant to all four short-baseline anomalies and the development of tools for efficient tests of these models with existing and future experimental datasets; 4) Openly share data -- Fluid communication between the experimental and theory communities will be required, which implies that both experimental data releases and theoretical calculations should be publicly available; and 5) Apply robust analysis techniques -- Appropriate statistical treatment is crucial to assess the compatibility of data sets within the context of any given model., Comment: Contribution to Snowmass 2021 by the NF02 Topical Group (Understanding Experimental Neutrino Anomalies). Published in J. Phys. G as a Major Report

Published
2022
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10. High Energy Physics Opportunities Using Reactor Antineutrinos

Author

Akindele, O. A., Berryman, J. M., Bowden, N. S., Carr, R., Conant, A. J., Huber, P., Langford, T. J., Link, J. M., Littlejohn, B. R., Fernandez-Moroni, G., Ochoa-Ricoux, J. P., Roca, C., Schoppmann, S., Strigari, L., Xu, J., Zhang, C., and Zhang, X.

Subjects
High Energy Physics - Experiment
Abstract

Nuclear reactors are uniquely powerful, abundant, and flavor-pure sources of antineutrinos that continue to play a vital role in the US neutrino physics program. The US reactor antineutrino physics community is a diverse interest group encompassing many detection technologies and many particle physics topics, including Standard Model and short-baseline oscillations, BSM physics searches, and reactor flux and spectrum modeling. The community's aims offer strong complimentary with numerous aspects of the wider US neutrino program and have direct relevance to most of the topical sub-groups composing the Snowmass 2021 Neutrino Frontier. Reactor neutrino experiments also have a direct societal impact and have become a strong workforce and technology development pipeline for DOE National Laboratories and universities. This white paper, prepared as a submission to the Snowmass 2021 community organizing exercise, will survey the state of the reactor antineutrino physics field and summarize the ways in which current and future reactor antineutrino experiments can play a critical role in advancing the field of particle physics in the next decade., Comment: Contribution to Snowmass 2021

Published
2022

11. Physics Opportunities with PROSPECT-II

Author

Andriamirado, M., Balantekin, A. B., Bass, C. D., Bergeron, D. E., Bernard, 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., 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., 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., Roca, C., Rosero, R., Searles, M., Surukuchi, P. T., Sutanto, F., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Weatherly, P. B., Wilhelmi, J., Woolverton, A., Yeh, M., Zhang, C., and Zhang, X.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

The PROSPECT experiment has substantially addressed the original 'Reactor Antineutrino Anomaly' by performing a high-resolution spectrum measurement from an enriched compact reactor core and a reactor model-independent sterile neutrino oscillation search based on the unique spectral distortions the existence of eV$^2$-scale sterile neutrinos would impart. But as the field has evolved, the current short-baseline (SBL) landscape supports many complex phenomenological interpretations, establishing a need for complementary experimental approaches to resolve the situation. While the global suite of SBL reactor experiments, including PROSPECT, have probed much of the sterile neutrino parameter space, there remains a large region above 1 eV$^2$ that remains unaddressed. Recent results from BEST confirm the Gallium Anomaly, increasing its significance to $\sim 5\sigma$, with sterile neutrinos providing a possible explanation of this anomaly. Separately, the MicroBooNE exclusion of electron-like signatures causing the MiniBooNE low-energy excess does not eliminate the possibility of sterile neutrinos as an explanation. Focusing specifically on the future use of reactors as a neutrino source for beyond-the-standard-model physics and applications, higher-precision spectral measurements still have a role to play. These recent results have created a confusing landscape which requires new data to disentangle the seemingly contradictory measurements. To directly probe $\overline{\nu}_{e}$ disappearance from high $\Delta m^2$ sterile neutrinos, the PROSPECT collaboration proposes to build an upgraded and improved detector, PROSPECT-II. It features an evolutionary detector design which can be constructed and deployed within one year and have impactful physics with as little as one calendar year of data., Comment: contribution to Snowmass 2021

Published
2022

12. The Double Chooz antineutrino detectors

Author

Double Chooz Collaboration, de Kerret, H., Abe, Y., Aberle, C., Abrahão, T., Ahijado, J. M., Akiri, T., Alarcón, J. M., Alba, J., Almazan, H., Anjos, J. C. dos, Appel, S., Ardellier, F., Barabanov, I., Barriere, J. C., Baussan, E., Baxter, A., Bekman, I., Bergevin, M., Bernstein, A., Bertoli, W., Bezerra, T. J. C., Bezrukov, L., Blanco, C., Bleurvacq, N., Blucher, E., Bonet, H., Bongrand, M., Bowden, N. S, Brugière, T., Buck, C., Avanzini, M. Buizza, Busenitz, J., Cabrera, A., Calvo, E., Camilleri, L., Carr, R., Cazaux, S., Cela, J. M., Cerrada, M., Chang, P. J., Charon, P., Chauveau, E., Chimenti, P., Classen, T., Collin, A. P., Conover, E., Conrad, J. M, Cormon, S., Corpace, O., Courty, B., Crespo-Anadón, J. I., Cribier, M., Crum, K., Cuadrado, S., Cucoanes, A., D'Agostino, M., Damon, E., Dawson, J. V., Dazeley, S., Dierckxsens, M., Dietrich, D., Djurcic, Z., Dorigo, F., Dracos, M., Durand, V., Efremekov, Y., Elnimr, M., Etenko, A., Falk, E., Fallot, M., Fechner, M., Felde, J., Fernandes, S. M., Fernández-Bedoya, C., Francia, D., Franco, D., Fischer, V., Franke, A. J., Franke, M., Furuta, H., Garcia, F., Garcia, J., Gil-Botella, I., Giot, L., Givaudan, A., Göger-Neff, M., Gomez, H., Gonzalez, L. F. G., Goodenough, L., Goodman, M. C., Goon, J., Gramlich, B., Greiner, D., Guertin, A., Guillon, B., Habib, S. M., Haddad, Y., Hara, T., Hartmann, F. X., Hartnell, J., Haser, J., Hatzikoutelis, A., Hellwig, D., Hervé, S., Hofacker, R., Horton-Smith, G., Hourlier, A., Ishitsuka, M., Jänner, K., Jiménez, S., Jochum, J., Jollet, C., Kaether, F., Kale, K., Kalousis, L., Kamyshkov, Y., Kaneda, M., Kaplan, D. M., Karakac, M., Kawasaki, T., Kemp, E., Kibe, Y., Kirchner, T., Konno, T., Kryn, D., Kutter, T., Kuze, M., Lachenmaier, T., Lane, C. E., Langbrandtner, C., Lasserre, T., Lastoria, C., Latron, L., Leonardo, C., Letourneau, A., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Lucht, S., Maeda, J., Maesano, C. N., Mariani, C., Maricic, J., Marie, F., Martinez, J. J., Martino, J., Matsubara, T., McKee, D., Meigner, F., Mention, G., Meregaglia, A., Meyer, J. P., Miletic, T., Milincic, R., Millot, J. F., Minotti, A., Mirones, V., Miyata, H., Mueller, Th. A., Nagasaka, Y., Nakajima, K., Navas-Nicolás, D., Nikitenko, Y., Novella, P., Oberauer, L., Obolensky, M., Onillon, A., Oralbaev, A., Ostrovskiy, I., Palomares, C., Peeters, S. J. M., Pepe, I. M., Perasso, S., Perrin, P., Pfahler, P., Porta, A., Pronost, G., Puras, J. C., Quéval, R., Ramirez, J. L., Reichenbacher, J., Reinhold, B., Reissfelder, M., Remoto, A., Reyna, D., Rodriguez, I., Röhling, M., Roncin, R., Rudolf, N., Rybolt, B., Sakamoto, Y., Santorelli, R., Sato, F., Schwan, U., Scola, L., Settimo, M., Schönert, S., Schoppmann, S., Shaevitz, M. A., Sharankova, R., Sibille, V., Sida, J. L., Sinev, V., Shrestha, D., Skorokhvatov, M., Soldin, P., Spitz, J., Stahl, A., Stancu, I., Starzynski, P., Stock, M. R., Stokes, L. F. F., Strait, M., Stüken, A., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Sun, Z., Svoboda, R., Tabata, H., Tamura, N., Terao, K., Tonazzo, A., Toral, F., Toups, M., Thi, H. Trinh, Valdivia, F., Valdiviesso, G., Vassilopoulos, N., Verdugo, A., Veyssiere, C., Viaud, B., Vignaud, D., Vivier, M., Wagner, S., Wiebusch, C., White, B., Winslow, L., Worcester, M., Wurm, M., Wurtz, J., Yang, G., Yáñez, J., Yermia, F., and Zbiri, K.

Subjects
Physics - Instrumentation and Detectors
Abstract

This article describes the setup and performance of the near and far detectors in the Double Chooz experiment. The electron antineutrinos of the Chooz nuclear power plant were measured in two identically designed detectors with different average baselines of about 400 m and 1050 m from the two reactor cores. Over many years of data taking the neutrino signals were extracted from interactions in the detectors with the goal of measuring a fundamental parameter in the context of neutrino oscillation, the mixing angle {\theta}13. The central part of the Double Chooz detectors was a main detector comprising four cylindrical volumes filled with organic liquids. From the inside towards the outside there were volumes containing gadolinium-loaded scintillator, gadolinium-free scintillator, a buffer oil and, optically separated, another liquid scintillator acting as veto system. Above this main detector an additional outer veto system using plastic scintillator strips was installed. The technologies developed in Double Chooz were inspiration for several other antineutrino detectors in the field. The detector design allowed implementation of efficient background rejection techniques including use of pulse shape information provided by the data acquisition system. The Double Chooz detectors featured remarkable stability, in particular for the detected photons, as well as high radiopurity of the detector components., Comment: 49 pages, 29 figures

Published
2022
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13. PROSPECT-II Physics Opportunities

Author

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., Searles, M., Surukuchi, P. T., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Weatherly, P. B., White, C., Wilhelmi, J., Woolverton, A., Yeh, M., Zhang, C., and Zhang, X.

Subjects
High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
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.

Published
2021
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14. Joint Measurement of the $^{235}$U Antineutrino Spectrum by Prospect and Stereo

Author

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., Sanchez, P. del Amo, Delgado, A., Diwan, M. V., Dolinski, M. J., Atmani, I. El, 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., and Zhang, X.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
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 $\chi^2/\mathrm{ndf} = 24.1/21$, allowing a joint unfolding of the prompt energy measurements into antineutrino energy. This $\bar{\nu}_e$ 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 $\chi^2$ value is improved, corresponding to a $2.4\sigma$ significance.

Published
2021
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15. Measurement of the $^{239}$Pu(n,f)/$^{235}$U(n,f) Cross-Section Ratio with the NIFFTE fission Time Projection Chamber

Author

Snyder, L., Anastasiou, M., Bowden, N. S., Bundgaard, J., Casperson, R. J., Cebra, D. A., Classen, T., Dongwi, D. H., Fotiades, N., Gearhart, J., Geppert-Kleinrath, V., Greife, U., Hagmann, C., Heffner, M., Hensle, D., Higgins, D., Isenhower, L. D., Kazkaz, K., Kemnitz, A., King, J., Klay, J. L., Latta, J., Leal-Cidoncha, E., Loveland, W., Magee, J. A., Manning, B., Mendenhall, M. P., Monterial, M., Mosby, S., Neudecker, D., Prokop, C., Sangiorgio, S., Schmitt, K. T., Seilhan, B., Tovesson, F., Towell, R. S., Walsh, N., Watson, T. S., Yao, L., and Younes, W.

Subjects
Nuclear Experiment
Abstract

The $^{239}$Pu(n,f)/$^{235}$U(n,f) cross-section ratio has been measured with the fission Time Projection Chamber (fissionTPC) from 100 keV to 100 MeV. The fissionTPC provides three-dimensional reconstruction of fission-fragment ionization profiles, allowing for a precise quantification of measurement uncertainties. The measurement was performed at the Los Alamos Neutron Science Center which provides a pulsed white source of neutrons. The data are recommended to be used as a cross-section ratio shape. A discussion of the status of the absolute normalization and comparisons to ENDF evaluations and previous measurements is included.

Published
2021

16. Joint Determination of Reactor Antineutrino Spectra from $^{235}$U and $^{239}$Pu Fission by Daya Bay and PROSPECT

Author

Daya Bay Collaboration, PROSPECT Collaboration, An, F. P., Andriamirado, M., Balantekin, A. B., Band, H. R., Bass, C. D., Bergeron, D. E., Berish, D., Bishai, M., Blyth, S., Bowden, N. S., Bryan, C. D., Cao, G. F., Cao, J., Chang, J. F., Chang, Y., Chen, H. S., Chen, S. M., Chen, Y., Chen, Y. X., Cheng, J., Cheng, Z. K., Cherwinka, J. J., Chu, M. C., Classen, T., Conant, A. J., Cummings, J. P., Dalager, O., Deichert, G., Delgado, A., Deng, F. S., Ding, Y. Y., Diwan, M. V., Dohnal, T., Dolinski, M. J., Dolzhikov, D., Dove, J., Dvorak, M., Dwyer, D. A., Erickson, A., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gallo, J. P., Gilbert, C. E., Gonchar, M., Gong, G. H., Gong, H., Grassi, M., Gu, W. Q., Guo, J. Y., Guo, L., Guo, X. H., Guo, Y. H., Guo, Z., Hackenburg, R. W., Hans, S., Hansell, A. B., He, M., Heeger, K. M., Heffron, B., Heng, Y. K., Hor, Y. K., Hsiung, Y. B., Hu, B. Z., Hu, J. R., Hu, T., Hu, Z. J., Huang, H. X., Huang, J. H., Huang, X. T., Huang, Y. B., Huber, P., Koblanski, J., Jaffe, D. E., Jayakumar, S., Jen, K. L., Ji, X. L., Ji, X. P., Johnson, R. A., Jones, D. C., Kang, L., Kettell, S. H., Kohn, S., Kramer, M., Kyzylova, O., Lane, C. E., Langford, T. J., LaRosa, J., Lee, J., Lee, J. H. C., Lei, R. T., Leitner, R., Leung, J. K. C., Li, F., Li, H. L., Li, J. J., Li, Q. J., Li, R. H., Li, S., Li, S. C., Li, W. D., Li, X. N., Li, X. Q., Li, Y. F., Li, Z. B., Liang, H., Lin, C. J., Lin, G. L., Lin, S., Ling, J. J., Link, J. M., Littenberg, L., Littlejohn, B. R., Liu, J. C., Liu, J. L., Liu, J. X., Lu, C., Lu, H. Q., Lu, X., Luk, K. B., Ma, B. Z., Ma, X. B., Ma, X. Y., Ma, Y. Q., Mandujano, R. C., Maricic, J., Marshall, C., McDonald, K. T., McKeown, R. D., Mendenhall, M. P., Meng, Y., Meyer, A. M., Milincic, R., Mueller, P. E., Mumm, H. P., Napolitano, J., Naumov, D., Naumova, E., Neilson, R., Nguyen, T. M. T., Nikkel, J. A., Nour, S., Ochoa-Ricoux, J. P., Olshevskiy, A., Palomino, J. L., Pan, H. -R., Park, J., Patton, S., Peng, J. C., Pun, C. S. J., Pushin, D. A., Qi, F. Z., Qi, M., Qian, X., Raper, N., Ren, J., Reveco, C. Morales, Rosero, R., Roskovec, B., Ruan, X. C., Searles, M., Steiner, H., Sun, J. L., Surukuchi, P. T., Tmej, T., Treskov, K., Tse, W. -H., Tull, C. E., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Viren, B., Vorobel, V., Wang, C. H., Wang, J., Wang, M., Wang, N. Y., Wang, R. G., Wang, W., Wang, X., Wang, Y., Wang, Y. F., Wang, Z., Wang, Z. M., Weatherly, P. B., Wei, H. Y., Wei, L. H., Wen, L. J., Whisnant, K., White, C., Wilhelmi, J., Wong, H. L. H., Woolverton, A., Worcester, E., Wu, D. R., Wu, F. L., Wu, Q., Wu, W. J., Xia, D. M., Xie, Z. Q., Xing, Z. Z., Xu, H. K., Xu, J. L., Xu, T., Xue, T., Yang, C. G., Yang, L., Yang, Y. Z., Yao, H. F., Ye, M., Yeh, M., Young, B. L., Yu, H. Z., Yu, Z. Y., Yue, B. B., Zavadskyi, V., Zeng, S., Zeng, Y., Zhan, L., Zhang, C., Zhang, F. Y., Zhang, H. H., Zhang, J. W., Zhang, Q. M., Zhang, S. Q., Zhang, X., Zhang, X. T., Zhang, Y. M., Zhang, Y. X., Zhang, Y. Y., Zhang, Z. J., Zhang, Z. P., Zhang, Z. Y., Zhao, J., Zhao, R. Z., Zhou, L., Zhuang, H. L., and Zou, J. H.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

A joint determination of the reactor antineutrino spectra resulting from the fission of $^{235}$U and $^{239}$Pu has been carried out by the Daya Bay and PROSPECT collaborations. This Letter reports the level of consistency of $^{235}$U spectrum measurements from the two experiments and presents new results from a joint analysis of both data sets. The measurements are found to be consistent. The combined analysis reduces the degeneracy between the dominant $^{235}$U and $^{239}$Pu isotopes and improves the uncertainty of the $^{235}$U spectral shape to about 3\%. The ${}^{235}$U and $^{239}$Pu antineutrino energy spectra are unfolded from the jointly deconvolved reactor spectra using the Wiener-SVD unfolding method, providing a data-based reference for other reactor antineutrino experiments and other applications. This is the first measurement of the $^{235}$U and $^{239}$Pu spectra based on the combination of experiments at low- and highly enriched uranium reactors., Comment: 8 pages, 5 figures, Supplementary Material Included

Published
2021
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17. Measurement of material isotopics and atom number ratio with alpha-particle spectroscopy for the NIFFTE fission Time Projection Chamber actinide target

Author

Monterial, M., Schmitt, K. T., Prokop, C., Leal-Cidoncha, E., Anastasiou, M., Bowden, N. S., Bundgaard, J., Casperson, R. J., Cebra, D. A., Classen, T., Dongwi, D. H., Fotiades, N., Gearhart, J., Geppert-Kleinrath, V., Greife, U., Hagmann, C., Heffner, M., Hensle, D., Higgins, D., Isenhower, L. D., Kazkaz, K., Kemnitz, A., King, J., Klay, J. L., Latta, J., Loveland, W., Magee, J. A., Manning, B., Mendenhall, M. P., Mosby, S., Neudecker, D., Sangiorgio, S., Seilhan, B., Snyder, L., Tovesson, F., Towell, R. S., Walsh, N., Watson, T. S., Yao, L., and Younes, W.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

We present the results of a measurement of isotopic concentrations and atomic number ratio of a double-sided actinide target with alpha-spectroscopy and mass spectrometry. The double-sided actinide target, with primarily Pu-239 on one side and U-235 on the other, was used in the fission Time Projection Chamber (fissionTPC) for a measurement of the neutron-induced fission cross-section ratio between the two isotopes. The measured atomic number ratio is intended to provide an absolute normalization of the measured fission cross-section ratio. The Pu-239/U-235 atom number ratio was measured with a combination of mass spectrometry and alpha-spectroscopy with a planar silicon detector with uncertainties of less than 1%., Comment: 8 pages, 5 figures, 6 tables

Published
2021
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18. Limits on Sub-GeV Dark Matter from the PROSPECT Reactor Antineutrino Experiment

Author

Andriamirado, M., Balantekin, A. B., Band, H. R., Bass, C. D., Bergeron, D. E., Bowden, N. S., 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, S., Hansell, A. B., Heeger, K. M., Heffron, B., Jaffe, D. E., Jayakumar, S., Ji, X., Jones, D. C., Koblanski, J., 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., Surukuchi, P. T., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Weatherly, P. B., White, C., Wilhelmi, J., Woolverton, A., Yeh, M., Zhang, C., Zhang, X., and Cappiello, C. V.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

If dark matter has mass lower than around 1 GeV, it will not impart enough energy to cause detectable nuclear recoils in many direct-detection experiments. However, if dark matter is upscattered to high energy by collisions with cosmic rays, it may be detectable in both direct-detection experiments and neutrino experiments. We report the results of a dedicated search for boosted dark matter upscattered by cosmic rays using the PROSPECT reactor antineutrino experiment. We show that such a flux of upscattered dark matter would display characteristic diurnal sidereal modulation, and use this to set new experimental constraints on sub-GeV dark matter exhibiting large interaction cross-sections., Comment: 11 pages, 8 figures

Published
2021
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19. Measurement of Muon-induced High-energy Neutrons from Rock in an Underground Gd-doped Water Detector

Author

Sutanto, F., Akindele, O. A., Askins, M., Bergevin, M., Bernstein, A., Bowden, N. S., Dazeley, S., Jaffke, P., Jovanovic, I., Quillin, S., Roecker, C., and Rountree, S. D.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

We present a measurement of the rate of correlated neutron captures in the WATCHBOY detector, deployed at a depth of approximately 390 meters water equivalent (m.w.e.) in the Kimballton Underground Research Facility (KURF). WATCHBOY consists of a cylindrical 2 ton water target doped with 0.1% gadolinium, surrounded by a 40 ton undoped water hermetic shield. We present a comparison of our results with the expected rate of correlated neutron captures arising from high-energy neutrons incident on the outside of the WATCHBOY shield, predicted by a hybrid FLUKA/GEANT4-based simulation. The incident neutron energy distribution used in the simulation was measured by a fast neutron spectrometer, the 1.8-ton Multiplicity and Recoil Spectrometer (MARS) detector, at the same depth. We find that the measured detection rate of two correlated neutrons is consistent with that predicted by simulation. The result lends additional confidence in the detection technique used by MARS, and therefore in the MARS spectra as measured at three different depths. Confirmation of the fast neutron flux and spectrum is important as it helps validate the scaling models used to predict the fast neutron fluxes at different overburdens., Comment: 11 pages, 16 figures, Phys. Rev. C (forthcoming)

Published
2020
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20. Note on arXiv:2005.05301, 'Preparation of the Neutrino-4 experiment on search for sterile neutrino and the obtained results of measurements'

Author

Almazán, H., Andriamirado, M., Balantekin, A. B., Band, H. R., Bass, C. D., Bergeron, D. E., Berish, D., Bonhomme, A., Bowden, N. S., Brodsky, J. P., Bryan, C. D., Buck, C., Classen, T., Conant, A. J., Deichert, G., Sanchez, P. del Amo, Diwan, M. V., Dolinski, M. J., Atmani, I. El, 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., Jaffe, D. E., Ji, X., Jones, D. C., Kyzylova, O., Labit, L., Lamblin, J., Lane, C. E., Langford, T. J., LaRosa, J., Letourneau, A., Lhuillier, D., Licciardi, M., Littlejohn, B. R., Lu, X., Maricic, J., Materna, T., Mendenhall, M. P., Meyer, A. M., Milincic, R., Mitchell, I., Mueller, P. E., Mumm, H. P., Napolitano, J., Nave, C., Neilson, R., Nikkel, J. A., Norcini, D., Nour, S., Palomino-Gallo, J. L., Pessard, H., Pushin, D. A., Qian, X., Réal, J. -S., Roca, C., Rogly, R., Romero-Romero, E., Rosero, R., Savu, V., Schoppmann, S., 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, A., Zhang, C., and Zhang, X.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

We comment on the claimed observation [arXiv:arXiv:2005.05301] of sterile neutrino oscillations by the Neutrino-4 collaboration. Such a claim, which requires the existence of a new fundamental particle, demands a level of rigor commensurate with its impact. The burden lies with the Neutrino-4 collaboration to provide the information necessary to prove the validity of their claim to the community. In this note, we describe aspects of both the data and analysis method that might lead to an oscillation signature arising from a null experiment and describe additional information needed from the Neutrino-4 collaboration to support the oscillation claim. Additionally, as opposed to the assertion made by the Neutrino-4 collaboration, we also show that the method of 'coherent summation' using the $L/E$ parameter produces similar results to the methods used by the PROSPECT and the STEREO collaborations., Comment: 5 pages, 3 figures

Published
2020

21. Improved Short-Baseline Neutrino Oscillation Search and Energy Spectrum Measurement with the PROSPECT Experiment at HFIR

Author

Andriamirado, M., 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., Goddard, B. W., 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., Meyer, A. M., Milincic, R., Mitchell, I., Mueller, P. E., Mumm, H. P., Napolitano, J., Nave, C., Neilson, R., Nikkel, J. A., Norcini, D., Nour, S., Palomino, J. L., Pushin, D. A., Qian, X., Romero-Romero, E., Rosero, R., Surukuchi, P. T., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Weatherly, P. B., White, C., Wilhelmi, J., Woolverton, A., Yeh, M., Zhang, A., Zhang, C., and Zhang, X.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

We present a detailed report on sterile neutrino oscillation and U-235 antineutrino energy spectrum measurement results from the PROSPECT experiment at the highly enriched High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. In 96 calendar days of data taken at an average baseline distance of 7.9 m from the center of the 85 MW HFIR core, the PROSPECT detector has observed more than 50,000 interactions of antineutrinos produced in beta decays of U-235 fission products. New limits on the oscillation of antineutrinos to light sterile neutrinos have been set by comparing the detected energy spectra of ten reactor-detector baselines between 6.7 and 9.2 meters. Measured differences in energy spectra between baselines show no statistically significant indication of antineutrinos to sterile neutrino oscillation and disfavor the Reactor Antineutrino Anomaly best-fit point at the 2.5$\sigma$ confidence level. The reported U-235 antineutrino energy spectrum measurement shows excellent agreement with energy spectrum models generated via conversion of the measured U-235 beta spectrum, with a $\chi^2$/DOF of 31/31. PROSPECT is able to disfavor at 2.4$\sigma$ confidence level the hypothesis that U-235 antineutrinos are solely responsible for spectrum discrepancies between model and data obtained at commercial reactor cores. A data-model deviation in PROSPECT similar to that observed by commercial core experiments is preferred with respect to no observed deviation, at a 2.2$\sigma$ confidence level., Comment: 42 pages, 52 Figures. Submitted to Phys. Rev. D. Supplementary Material Included

Published
2020
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22. Nonfuel Antineutrino Contributions in the High Flux Isotope Reactor

Author

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., and Zhang, X.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
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.

Published
2020
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23. Neutron Induced Fission Fragment Angular Distributions, Anisotropy, and Linear Momentum Transfer Measured with the NIFFTE Fission Time Projection Chamber

Author

Hensle, D., Barker, J. T., Barrett, J. S., Bowden, N. S., Brewster, K. J., Bundgaard, J., Case, Z. Q., Casperson, R. J., Cebra, D. A., Classen, T., Duke, D. L., Fotiadis, N., Gearhart, J, Geppert-Kleinrath, V., Greife, U., Guardincerri, E., Hagmann, C., Heffner, M., Hicks, C. R., Higgins, D., Isenhower, L. D., Kazkaz, K., Kemnitz, A., Kiesling, K. J., King, J., Klay, J. L., Latta, J., Leal, E., Loveland, W., Lynch, M., Magee, J. A., Manning, B., Mendenhall, M. P., Monterial, M., Mosby, S., Oman, G., Prokop, C., Sangiorgio, S., Schmitt, K. T., Seilhan, B., Snyder, L., Tovesson, F., Towell, C. L., Towell, R. S., Towell, T. R., Walsh, N., Watson, T. S., Yao, L., and Younes, W.

Subjects
Nuclear Experiment
Abstract

The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has performed measurements with a fission time projection chamber (fissionTPC) to study the fission process by reconstructing full three-dimensional tracks of fission fragments and other ionizing radiation. The amount of linear momentum imparted to the fissioning nucleus by the incident neutron can be inferred by measuring the opening angle between the fission fragments. Using this measured linear momentum, fission fragment angular distributions can be converted to the center-of-mass frame for anisotropy measurements. Angular anisotropy is an important experimental observable for understanding the quantum mechanical state of the fissioning nucleus and vital to determining detection efficiency for cross section measurements. Neutron linear momentum transfer to fissioning $^{235}$U, $^{238}$U, and $^{239}$Pu and fission fragment angular anisotropy of $^{235}$U and $^{238}$U as a function of neutron energies in the range 130 keV--250 MeV are presented.

Published
2020
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24. Applied Antineutrino Physics 2018 Proceedings

Author

Bergevin, M., Bowden, N., Mumm, H. P., Verstraeten, M., Park, J., Han, B., Shitov, Y., Serebrov, A. P., Onillon, A., Karagiorgi, G., Nakajima, K., Chimenti, P., Coleman, J., Askins, M., Marti-Magro, L., Hill, T., Carr, R., Johnston, J., Mabe, A. N., Yeh, M., Gann, G. D. Orebi, Mendenhall, M. P., Mulmule, D., Danielson, D. L., and Learned, J. G.

Subjects
High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

Proceedings for the 14th installment of Applied Antineutrino Physics (AAP) workshop series.

Published
2019

25. The Radioactive Source Calibration System of the PROSPECT Reactor Antineutrino Detector

Author

PROSPECT Collaboration, 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., Dean, D., Deichert, G., Diwan, M. V., Dolinski, M. J., Erickson, A., Foust, B. T., Febbraro, M., Gaison, J. K., Galindo-Uribarri, A., Gilbert, C. E., Hackett, B. T., Hans, S., Hansell, A. B., Heeger, K. M., Insler, J., Jaffe, D. E., Jones, D. C., Kyzylova, O., Lane, C. E., Langford, T. J., LaRosa, J., Littlejohn, B. R., Lu, X., Caicedo, D. A. Martinez, Matta, J. T., McKeown, R. D., Mendenhall, M. P., 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., and Zhang, X.

Subjects
Physics - Instrumentation and Detectors
Abstract

The Precision Reactor Oscillation and Spectrum (PROSPECT) Experiment is a reactor neutrino experiment designed to search for sterile neutrinos with a mass on the order of 1 eV/c$^2$ and to measure the spectrum of electron antineutrinos from a highly-enriched $^{235}$U nuclear reactor. The PROSPECT detector consists of an 11 by 14 array of optical segments in $^{6}$Li-loaded liquid scintillator at the High Flux Isotope Reactor in Oak Ridge National Laboratory. Antineutrino events are identified via inverse beta decay and read out by photomultiplier tubes located at the ends of each segment. The detector response is characterized using a radioactive source calibration system. This paper describes the design, operation, and performance of the PROSPECT source calibration system.

Published
2019
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26. 1H(n,el) as a Cross Section Reference in a White Source Neutron Beam With the fissionTPC

Author

Walsh, N. I., Barker, J. T., Bowden, N. S., Brewster, K. J., Casperson, R. J., Classen, T., Fotiadis, N., Greife, U., Guardincerri, E., Hagmann, C., Heffner, M., Hensle, D., Hicks, C. R., Higgins, D., Isenhower, L. D., Kemnitz, A., Kiesling, K. J., King, J., Klay, J. L., Latta, J., Loveland, W., Magee, J. A., Mendenhall, M. P., Monterial, M., Mosby, S., Oman, G., Sangiorgio, S., Seilhan, B., Snyder, L., Towell, C. L., Towell, R. S., Towell, T. R., Schmitt, K. T., Watson, S., Yao, L., and Younes, W.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

We provide a quantitative description of a method to measure neutron-induced fission cross sections in ratio to elastic hydrogen scattering in a white-source neutron beam with the fission Time Projection Chamber. This detector has measured precision fission cross section ratios using actinide references such as $^{235}$U(n,f) and $^{238}$U(n,f). However, by employing a more precise reference such as the H(n,el) cross section there is the potential to further reduce the evaluation uncertainties of the measured cross sections. In principle the fissionTPC could provide a unique measurement by simultaneously measuring both fission fragments and proton recoils over a large solid angle. We investigate one method with a hydrogenous gas target and with the neutron energy determined by the proton recoil kinematics. This method enables the measurement to be performed in a white-source neutron beam and with the current configuration of the fissionTPC. We show that while such a measurement is feasible in the energy range of 0.5 MeV to $\sim$10 MeV, uncertainties on the proton detection efficiency and the neutron energy resolution do not allow us to preform a fission ratio measurement to the desired precision. Utilizing either a direct measurement of the neutron time-of-flight for the recoil proton or a mono-energetic neutron source or some combination of both would provide a path to a sub-percent precision measurement.

Published
2019

27. A Low Mass Optical Grid for the PROSPECT Reactor Antineutrino Detector

Author

PROSPECT Collaboration, 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., Davee, D., Dean, D., Deichert, G., Diwan, A. E. Detweiler M. V., Dolinski, M. J., Erickson, A., Febbraro, M., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gebre, Y., Gilbert, C. E., Gilje, K. E., Gustafson, I. F., Hackett, B. T., Hans, S., Hansell, A. B., Heeger, K. M., Hermanek, K. H., Insler, J., Jaffe, D. E., Jones, D. C., Kyzylova, O., Lane, C. E., Langford, T. J., LaRosa, J., Littlejohn, B. R., Lu, X., Caicedo, D. A. Martinez, 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., Tyra, M. A., Varner, R. L., Viren, B., White, C., Wilhelmi, J., Wise, T., Yeh, M., Yen, Y. -R., Zhang, A., Zhang, C., and Zhang, X.

Subjects
Physics - Instrumentation and Detectors
Abstract

PROSPECT, the Precision Reactor Oscillation and SPECTrum experiment, is a short-baseline reactor antineutrino experiment designed to provide precision measurements of the $^{235}$U product $\overline{\nu}_e$ spectrum of utilizing an optically segmented 4-ton liquid scintillator detector. PROSPECT's segmentation system, the optical grid, plays a central role in reconstructing the position and energy of $\overline{\nu}_e$ interactions in the detector. This paper is the technical reference for this PROSPECT subsystem, describing its design, fabrication, quality assurance, transportation and assembly in detail. In addition, the dimensional, optical and mechanical characterizations of optical grid components and the assembled PROSPECT target are also presented. The technical information and characterizations detailed here will inform geometry-related inputs for PROSPECT physics analysis, and can guide a variety of future particle detection development efforts, such as those using optically reflecting materials or filament-based 3D printing., Comment: 31 pages, 28 figures

Published
2019
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28. Lithium-loaded Liquid Scintillator Production for the PROSPECT experiment

Author

PROSPECT Collaboration, Ashenfelter, J., Balantekin, A. B., Band, H. R., Bass, C. D., Bergeron, D. E., Berish, D., Bignell, L. J., Bowden, N. S., Brodsky, J. P., Bryan, C. D., Reyes, C. Camilo, Campos, S., Cherwinka, J. J., Classen, T., Conant, A. J., Davee, D., Dean, D., Deichert, G., Perez, R. Diaz, Diwan, M. V., Dolinski, M. J., Erickson, A., Febbraro, M., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gilbert, C. E., Hackett, B. T., Hans, S., Hansell, A. B., Hayes, B., Heeger, K. M., Insler, J., Jaffe, D. E., Jones, D. C., Kyzylova, O., Lane, C. E., Langford, T. J., LaRosa, J., Littlejohn, B. R., Lu, X., MartinezCaicedo, D. A., Matta, J. T., McKeown, R. D., Mendenhall, M. P., 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., Tyra, M. A., Varner, R. L., Viren, B., White, C., Wilhelmi, J., Wise, T., Yeh, M., Yen, Y. -R., Zhang, A., Zhang, C., and Zhang, X.

Subjects
Physics - Instrumentation and Detectors
Abstract

This work reports the production and characterization of lithium-loaded liquid scintillator (LiLS) for the Precision Reactor Oscillation and Spectrum Experiment (PROSPECT). Fifty-nine 90 liter batches of LiLS (${}^6{\rm Li}$ mass fraction 0.082%$\pm$0.001%) were produced and samples from all batches were characterized by measuring their optical absorbance relative to air, light yield relative to a pure liquid scintillator reference, and pulse shape discrimination capability. Fifty-seven batches passed the quality assurance criteria and were used for the PROSPECT experiment., Comment: 16 pages, 15 figures

Published
2019
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29. Measurement of the Antineutrino Spectrum from $^{235}$U Fission at HFIR with PROSPECT

Author

PROSPECT Collaboration, 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., Caicedo, D. A. Martinez, 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., and Zhang, X.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

This Letter reports the first measurement of the $^{235}$U $\overline{\nu_{e}}$ energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9m from the 85MW$_{\mathrm{th}}$ highly-enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678$\pm$304 (stat.) $\overline{\nu_{e}}$-induced inverse beta decays (IBD), 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 $\chi^2/ndf = 51.4/31$, 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 $\overline{\nu_{e}}$ energy region of 5-7MeV.

Published
2018
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30. The PROSPECT Reactor Antineutrino Experiment

Author

PROSPECT Collaboration, Ashenfelter, J., Balantekin, A. B., Baldenegro, C., Band, H. R., Bass, C. D., Bergeron, D. E., Berish, D., Bignell, L. J., Bowden, N. S., Boyle, J., Bricco, J., Brodsky, J. P., Bryan, C. D., Telles, A. Bykadorova, Cherwinka, J. J., Classen, T., Commeford, K., Conant, A., Cox, A. A., Davee, D., Dean, D., Deichert, G., Diwan, M. V., Dolinski, M. J., Erickson, A., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gilbert, C., Gilje, K., Glenn, A., Goddard, B. W., Hackett, B., 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., Caicedo, D. A. Martinez, Matta, J. T., McKeown, R. D., Mendenhall, M. P., Miller, H. J., Minock, J., 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., 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., and Zhao, M.

Subjects
Physics - Instrumentation and Detectors
Abstract

The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, is designed to make both a precise measurement of the antineutrino spectrum from a highly-enriched uranium reactor and to probe eV-scale sterile neutrinos by searching for neutrino oscillations over meter-long baselines. PROSPECT utilizes a segmented $^6$Li-doped liquid scintillator detector for both efficient detection of reactor antineutrinos through the inverse beta decay reaction and excellent background discrimination. PROSPECT is a movable 4-ton antineutrino detector covering distances of 7m to 13m from the High Flux Isotope Reactor core. It will probe the best-fit point of the $\bar\nu_e$ disappearance experiments at 4$\sigma$ in 1 year and the favored regions of the sterile neutrino parameter space at more than 3$\sigma$ in 3 years. PROSPECT will test the origin of spectral deviations observed in recent $\theta_{13}$ experiments, search for sterile neutrinos, and address the hypothesis of sterile neutrinos as an explanation of the reactor anomaly. This paper describes the design, construction, and commissioning of PROSPECT and reports first data characterizing the performance of the PROSPECT antineutrino detector., Comment: 30 pages, 33 figures; updated with journal revision and reference

Published
2018
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31. First search for short-baseline neutrino oscillations at HFIR with PROSPECT

Author

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., Telles, A. Bykadorova, 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., Koehler, K., Kyzylova, O., Lane, C. E., Langford, T. J., LaRosa, J., Littlejohn, B. R., Lopez, F., Lu, X., Caicedo, D. A. Martinez, Matta, J., 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., and Zhao, M.

Subjects
High Energy Physics - Experiment
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 meter water equivalent overburden. Data collected during 33 live-days of reactor operation at a nominal power of 85 MW yields a detection of 25461 $\pm$ 283 (stat.) inverse beta decays. Observation of reactor antineutrinos can be achieved in PROSPECT at 5$\sigma$ statistical significance within two hours 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 2.2$\sigma$ confidence level., Comment: 7 pages, 5 figures; v3: Added additional supplemental files

Published
2018
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32. Performance of a segmented $^{6}$Li-loaded liquid scintillator detector for the PROSPECT experiment

Author

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., Telles, A. Bykadorova, Cherwinka, J. J., Classen, T., Commeford, K., Conant, A., Davee, D., Deichert, G., Diwan, M. V., Dolinski, M. J., Erickson, A., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gilje, K., Hackett, B., Han, K., Hans, S., Hansell, A., Heeger, K. M., Heffron, B., Insler, J., Jaffe, D. E., Jones, D., Kyzylova, O., Lane, C. E., Langford, T. J., LaRosa, J., Littlejohn, B. R., Lopez, F., Caicedo, D. A. Martinez, Matta, J., McKeown, R. D., Mendenhall, M. P., Minock, J., 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., Surukuchi, P. T., Trinh, C., Tyra, M. A., Wagner, J. M., White, C., Wilhelmi, J., Wise, T., Yeh, M., Yen, Y. -R., Zhang, A., Zhang, C., and Zhang, X.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

This paper describes the design and performance of a 50 liter, two-segment $^{6}$Li-loaded liquid scintillator detector that was designed and operated as prototype for the PROSPECT (Precision Reactor Oscillation and Spectrum) Experiment. The two-segment detector was constructed according to the design specifications of the experiment. It features low-mass optical separators, an integrated source and optical calibration system, and materials that are compatible with the $^{6}$Li-doped scintillator developed by PROSPECT. We demonstrate a high light collection of 850$\pm$20 PE/MeV, an energy resolution of $\sigma$ = 4.0$\pm$0.2% at 1 MeV, and efficient pulse-shape discrimination of low $dE/dx$ (electronic recoil) and high $dE/dx$ (nuclear recoil) energy depositions. An effective scintillation attenuation length of 85$\pm$3 cm is measured in each segment. The 0.1% by mass concentration of $^{6}$Li in the scintillator results in a measured neutron capture time of $\tau$ = 42.8$\pm$0.2 $\mu s$. The long-term stability of the scintillator is also discussed. The detector response meets the criteria necessary for achieving the PROSPECT physics goals and demonstrates features that may find application in fast neutron detection., Comment: 16 pages, 13 figures; minor edits to design detail and references

Published
2018
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33. Measurement of the normalized $^{238}$U(n,f)/$^{235}$U(n,f) cross section ratio from threshold to 30 MeV with the fission Time Projection Chamber

Author

Casperson, R. J., Asner, D. M., Baker, J., Baker, R. G., Barrett, J. S., Bowden, N. S., Brune, C., Bundgaard, J., Burgett, E., Cebra, D. A., Classen, T., Cunningham, M., Deaven, J., Duke, D. L., Ferguson, I., Gearhart, J., Geppert-Kleinrath, V., Greife, U., Grimes, S., Guardincerri, E., Hager, U., Hagmann, C., Heffner, M., Hensle, D., Hertel, N., Higgins, D., Hill, T., Isenhower, L. D., King, J., Klay, J. L., Kornilov, N., Kudo, R., Laptev, A. B., Loveland, W., Lynch, M., Lynn, W. S., Magee, J. A., Manning, B., Massey, T. N., McGrath, C., Meharchand, R., Mendenhall, M. P., Montoya, L., Pickle, N. T., Qu, H., Ruz, J., Sangiorgio, S., Schmitt, K. T., Seilhan, B., Sharma, S., Snyder, L., Stave, S., Tate, A. C., Tatishvili, G., Thornton, R. T., Tovesson, F., Towell, D. E., Towell, R. S., Walsh, N., Watson, S., Wendt, B., Wood, L., Yao, L., and Younes, W.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The normalized $^{238}$U(n,f)/$^{235}$U(n,f) cross section ratio has been measured using the NIFFTE fission Time Projection Chamber from the reaction threshold to $30$~MeV. The fissionTPC is a two-volume MICROMEGAS time projection chamber that allows for full three-dimensional reconstruction of fission-fragment ionization profiles from neutron-induced fission. The measurement was performed at the Los Alamos Neutron Science Center, where the neutron energy is determined from neutron time-of-flight. The $^{238}$U(n,f)/$^{235}$U(n,f) ratio reported here is the first cross section measurement made with the fissionTPC, and will provide new experimental data for evaluation of the $^{238}$U(n,f) cross section, an important standard used in neutron-flux measurements. Use of a development target in this work prevented the determination of an absolute normalization, to be addressed in future measurements. Instead, the measured cross section ratio has been normalized to ENDF/B-VIII.$\beta$5 at 14.5 MeV.

Published
2018
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34. Fission Fragment Angular Anisotropy in Neutron-Induced Fission of $^{235}$U Measured with a Time Projection Chamber

Author

Geppert-Kleinrath, V., Tovesson, F., Barrett, J. S., Bowden, N. S., Bundgaard, J., Casperson, R. J., Cebra, D. A., Classen, T., Cunningham, M., Duke, D. L., Gearhart, J., Greife, U., Guardincerri, E., Hagmann, C., Heffner, M., Hensle, D., Higgins, D., Isenhower, L. D., King, J., Klay, J. L., Loveland, W., Magee, J. A., Manning, B., Mendenhall, M. P., Ruz, J., Sangiorgio, S., Schmitt, K. T., Seilhan, B., Snyder, L., Tate, A. C., Towell, R. S., Walsh, N., Watson, S., Yao, L., Younes, W., and Leeb, H.

Subjects
Nuclear Experiment
Abstract

Fission fragment angular distributions can provide an important constraint on fission theory, improving predictive fission codes, and are a prerequisite for a precise ratio cross section measurement. Available anisotropy data is sparse, especially at neutron energies above 5 MeV. For the first time, a three-dimensional tracking detector is employed to study fragment emission angles and provide a direct measurement of angular anisotropy. The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has deployed the fission time projection chamber (fissionTPC) to measure nuclear data with unprecedented precision. The fission fragment anisotropy of $^{235}$U has been measured over a wide range of incident neutron energies from 180 keV to 200 MeV; a careful study of the systematic uncertainties complement the data., Comment: 10 pages, 12 figures, accepted to Physical Review C

Published
2017
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35. Applied Antineutrino Physics 2015 -- Conference Summary

Author

Bowden, N. S., Heeger, K. M., Huber, P., Mariani, C., and Vogelaar, R. B.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

This is a brief summary of the 11th Applied Antineutrino Physics 2015 workshop held at the Virginia Tech Arlington Research Facility from December 7-8, 2015., Comment: 37 pages, 19 figures

Published
2016

36. The Double Chooz antineutrino detectors

Author

de Kerret, H., Abe, Y., Aberle, C., Abrahão, T., Ahijado, J. M., Akiri, T., Alarcón, J. M., Alba, J., Almazan, H., dos Anjos, J. C., Appel, S., Ardellier, F., Barabanov, I., Barriere, J. C., Baussan, E., Baxter, A., Bekman, I., Bergevin, M., Bernstein, A., Bertoli, W., Bezerra, T. J. C., Bezrukov, L., Blanco, C., Bleurvacq, N., Blucher, E., Bonet, H., Bongrand, M., Bowden, N. S, Brugière, T., Buck, C., Avanzini, M. Buizza, Busenitz, J., Cabrera, A., Caden, E., Calvo, E., Camilleri, L., Carr, R., Cazaux, S., Cela, J. M., Cerrada, M., Chang, P. J., Charon, P., Chauveau, E., Chimenti, P., Classen, T., Collin, A. P., Conover, E., Conrad, J. M, Cormon, S., Corpace, O., Courty, B., Crespo-Anadón, J. I., Cribier, M., Crum, K., Cuadrado, S., Cucoanes, A., D’Agostino, M., Damon, E., Dawson, J. V., Dazeley, S., Dierckxsens, M., Dietrich, D., Djurcic, Z., Dorigo, F., Dracos, M., Durand, V., Efremeko, Y., Elnimr, M., Etenko, A., Falk, E., Fallot, M., Fechner, M., Felde, J., Fernandes, S. M., Fernández-Bedoya, C., Francia, D., Franco, D., Fischer, V., Franke, A. J., Franke, M., Furuta, H., Garcia, F., Garcia, J., Gil-Botella, I., Giot, L., Givaudan, A., Göger-Neff, M., Gomez, H., Gonzalez, L. F. G., Goodenough, L., Goodman, M. C., Goon, J., Gramlich, B., Greiner, D., Guertin, A., Guillon, B., Habib, S. M., Haddad, Y., Hara, T., Hartmann, F. X., Hartnell, J., Haser, J., Hatzikoutelis, A., Hellwig, D., Hervé, S., Hofacker, R., Horton-Smith, G., Hourlier, A., Ishitsuka, M., Jänner, K., Jiménez, S., Jochum, J., Jollet, C., Kaether, F., Kale, K., Kalousis, L., Kamyshkov, Y., Kaneda, M., Kaplan, D. M., Karakac, M., Kawasaki, T., Kemp, E., Kibe, Y., Kirchner, T., Konno, T., Kryn, D., Kutter, T., Kuze, M., Lachenmaier, T., Lane, C. E., Langbrandtner, C., Lasserre, T., Lastoria, C., Latron, L., Leonardo, C., Letourneau, A., Lhuillier, D., Lima, Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Lucht, S., Maeda, J., Maesano, C. N., Mariani, C., Maricic, J., Marie, F., Martinez, J. J., Martino, J., Matsubara, T., McKee, D., Meigner, F., Mention, G., Meregaglia, A., Meyer, J. P., Miletic, T., Milincic, R., Millot, J. F., Minotti, A., Mirones, V., Miyata, H., Mueller, Th. A., Nagasaka, Y., Nakajima, K., Navas-Nicolás, D., Nikitenko, Y., Novella, P., Oberauer, L., Obolensky, M., Onillon, A., Oralbaev, A., Ostrovskiy, I., Palomares, C., Peeters, S. J. M., Pepe, I. M., Perasso, S., Perrin, P., Pfahler, P., Porta, A., Pronost, G., Puras, J. C., Quéval, R., Ramirez, J. L., Reichenbacher, J., Reinhold, B., Reissfelder, M., Remoto, A., Reyna, D., Rodriguez, I., Röhling, M., Roncin, R., Rudolf, N., Rybolt, B., Sakamoto, Y., Santorelli, R., Sato, F., Schwan, U., Schönert, S., Schoppmann, S., Scola, L., Settimo, M., Shaevitz, M. A., Sharankova, R., Sibille, V., Sida, J.-L., Sinev, V., Shrestha, D., Skorokhvatov, M., Soldin, P., Spitz, J., Stahl, A., Stancu, I., Starzynski, P., Stock, M. R., Stokes, L. F. F., Strait, M., Stüken, A., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Sun, Z., Svoboda, R., Tabata, H., Tamura, N., Terao, K., Tonazzo, A., Toral, F., Toups, M., Thi, H. Trinh, Valdivia, F., Valdiviesso, G., Vassilopoulos, N., Verdugo, A., Veyssiere, C., Viaud, B., Vignaud, D., Vivier, M., Wagner, S., Wiebusch, C., White, B., Winslow, L., Worcester, M., Wurm, M., Wurtz, J., Yang, G., Yáñez, J., Yermia, F., and Zbiri, K.

Published
2022
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38. The PROSPECT Physics Program

Author

Ashenfelter, J., Balantekin, B., Band, H. R., Barclay, G., Bass, C. D., Berish, D., Bowden, N. S., Bowes, A., Bryan, C. D., Brodsky, J. P., Cherwinka, J. J., Chu, R., Classen, T., Commeford, K., Davee, D., Dean, D., Deichert, G., Diwan, M. V., Dolinski, M. J., Dolph, J., Gaison, J. K., Galindo-Uribarri, A., Gilje, K., Glenn, A., Goddard, B. W., Green, M., Han, K., Hans, S., Heeger, K. M., Heffron, B., Jaffe, D. E., Jones, D., Langford, T. J., Littlejohn, B. R., Caicedo, D. A. Martinez, McKeown, R. D., Mendenhall, M. P., Mueller, P., Mumm, H. P., Napolitano, J., Neilson, R., Norcini, D., Pushin, D., Qian, X., Romero, E., Rosero, R., Seilhan, B. S., Sharma, R., Sheets, S., Surukuchi, P. T., Varner, R. L., Viren, B., Wang, W., White, B., White, C., Wilhelmi, J., Williams, C., Wise, T., Yao, H., Yeh, M., Yen, Y. -R., Zangakis, G., Zhang, C., and Zhang, X.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract

The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, is designed to make a precise measurement of the antineutrino spectrum from a highly-enriched uranium reactor and probe eV-scale sterile neutrinos by searching for neutrino oscillations over meter-long distances. PROSPECT is conceived as a 2-phase experiment utilizing segmented $^6$Li-doped liquid scintillator detectors for both efficient detection of reactor antineutrinos through the inverse beta decay reaction and excellent background discrimination. PROSPECT Phase I consists of a movable 3-ton antineutrino detector at distances of 7 - 12 m from the reactor core. It will probe the best-fit point of the $\nu_e$ disappearance experiments at 4$\sigma$ in 1 year and the favored region of the sterile neutrino parameter space at $>$3$\sigma$ in 3 years. With a second antineutrino detector at 15 - 19 m from the reactor, Phase II of PROSPECT can probe the entire allowed parameter space below 10 eV$^{2}$ at 5$\sigma$ in 3 additional years. The measurement of the reactor antineutrino spectrum and the search for short-baseline oscillations with PROSPECT will test the origin of the spectral deviations observed in recent $\theta_{13}$ experiments, search for sterile neutrinos, and conclusively address the hypothesis of sterile neutrinos as an explanation of the reactor anomaly., Comment: 21 pages, 21 figures

Published
2015
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39. A search for cosmogenic production of $\beta$-neutron emitting radionuclides in water

Author

Dazeley, S., Askins, M., Bergevin, M., Bernstein, A., Bowden, N. S., Jaffke, P., Rountree, S. D., Shokair, T. M., and Sweany, M.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

Here we present the first results of WATCHBOY, a water Cherenkov detector designed to measure the yield of $\beta$-neutron emitting radionuclides produced by cosmic ray muons in water. In addition to the $\beta$-neutron measurement, we also provide a first look at isolating single-$\beta$ producing radionuclides following muon-induced hadronic showers as a check of the detection capabilities of WATCHBOY. The data taken over $207$ live days indicates a $^{9}$Li production yield upper limit of $1.9\times10^{-7}\mu^{-1}g^{-1}\mathrm{cm}^2$ at $\sim400$ meters water equivalent (m.w.e.) overburden at the $90\%$ confidence level. In this work the $^{9}$Li signal in WATCHBOY was used as a proxy for the combined search for $^{9}$Li and $^{8}$He production. This result will provide a constraint on estimates of antineutrino-like backgrounds in future water-based antineutrino detectors., Comment: 11 pages, 12 figures

Published
2015
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40. Light Collection and Pulse-Shape Discrimination in Elongated Scintillator Cells for the PROSPECT Reactor Antineutrino Experiment

Author

Ashenfelter, J., Balantekin, B., Band, H. R., Barclay, G., Bass, C. D., Berish, D., Bowden, N. S., Bowes, A., Brodsky, J. P., Bryan, C. D., Cherwinka, J. J., Chu, R., Classen, T., Commeford, K., Davee, D., Dean, D., Deichert, G., Diwan, M. V., Dolinski, M. J., Dolph, J., Dwyer, D. A., Gaison, J. K., Galindo-Uribarri, A., Gilje, K., Glenn, A., Goddard, B. W., Green, M., Han, K., Hans, S., Heeger, K. M., Heffron, B., Jaffe, D. E., Langford, T. J., Littlejohn, B. R., Caicedo, D. A. Martinez, McKeown, R. D., Mendenhall, M. P., Mueller, P., Mumm, H. P., Napolitano, J., Neilson, R., Norcini, D., Pushin, D., Qian, X., Romero, E., Rosero, R., Saldana, L., Seilhan, B. S., Sharma, R., Sheets, S., Stemen, N. T, Surukuchi, P. T., Varner, R. L., Viren, B., Wang, W., White, B., White, C., Wilhelmi, J., Williams, C., Wise, T., Yao, H., Yeh, M., Yen, Y. -R., Zangakis, G., Zhang, C., and Zhang, X.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

A meter-long, 23-liter EJ-309 liquid scintillator detector has been constructed to study the light collection and pulse-shape discrimination performance of elongated scintillator cells for the PROSPECT reactor antineutrino experiment. The magnitude and uniformity of light collection and neutron/gamma discrimination power in the energy range of antineutrino inverse beta decay products have been studied using gamma and spontaneous fission calibration sources deployed along the cell long axis. We also study neutron-gamma discrimination and light collection abilities for differing PMT and reflector configurations. Key design features for optimizing MeV-scale response and background rejection capabilities are identified., Comment: 20 pages, 11 figures

Published
2015
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41. Background Radiation Measurements at High Power Research Reactors

Author

Ashenfelter, J., Balantekin, B., Baldenegro, C. X., Band, H. R., Barclay, G., Bass, C. D., Berish, D., Bowden, N. S., Bryan, C. D., Cherwinka, J. J., Chu, R., Classen, T., Davee, D., Dean, D., Deichert, G., Dolinski, M. J., Dolph, J., Dwyer, D. A., Fan, S., Gaison, J. K., Galindo-Uribarri, A., Gilje, K., Glenn, A., Green, M., Han, K., Hans, S., Heeger, K. M., Heffron, B., Jaffe, D. E., Kettell, S., Langford, T. J., Littlejohn, B. R., Martinez, D., McKeown, R. D., Morrell, S., Mueller, P. E., Mumm, H. P., Napolitano, J., Norcini, D., Pushin, D., Romero, E., Rosero, R., Saldana, L., Seilhan, B. S., Sharma, R., Stemen, N. T., Surukuchi, P. T., Thompson, S. J., Varner, R. L., Wang, W., Watson, S. M., White, B., White, C., Wilhelmi, J., Williams, C., Wise, T., Yao, H., Yeh, M., Yen, Y. -R., Zhang, C., and Zhang, X.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract

Research reactors host a wide range of activities that make use of the intense neutron fluxes generated at these facilities. Recent interest in performing measurements with relatively low event rates, e.g. reactor antineutrino detection, at these facilities necessitates a detailed understanding of background radiation fields. Both reactor-correlated and naturally occurring background sources are potentially important, even at levels well below those of importance for typical activities. Here we describe a comprehensive series of background assessments at three high-power research reactors, including $\gamma$-ray, neutron, and muon measurements. For each facility we describe the characteristics and identify the sources of the background fields encountered. The general understanding gained of background production mechanisms and their relationship to facility features will prove valuable for the planning of any sensitive measurement conducted therein., Comment: 26 pages, 28 figures. Accepted for publication in Nuclear Instruments and Methods A. v2 incorporates minor revisions requested by NIMA

Published
2015
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42. The Intermediate Neutrino Program

Author

Adams, C., Alonso, J. R., Ankowski, A. M., Asaadi, J. A., Ashenfelter, J., Axani, S. N., Babu, K., Backhouse, C., Band, H. R., Barbeau, P. S., Barros, N., Bernstein, A., Betancourt, M., Bishai, M., Blucher, E., Bouffard, J., Bowden, N., Brice, S., Bryan, C., Camilleri, L., Cao, J., Carlson, J., Carr, R. E., Chatterjee, A., Chen, M., Chen, S., Chiu, M., Church, E. D., Collar, J. I., Collin, G., Conrad, J. M., Convery, M. R., Cooper, R. L., Cowen, D., Davoudiasl, H., De Gouvea, A., Dean, D. J., Deichert, G., Descamps, F., DeYoung, T., Diwan, M. V., Djurcic, Z., Dolinski, M. J., Dolph, J., Donnelly, B., Dwyer, D. A., Dytman, S., Efremenko, Y., Everett, L. L., Fava, A., Figueroa-Feliciano, E., Fleming, B., Friedland, A., Fujikawa, B. K., Gaisser, T. K., Galeazzi, M., Galehouse, D. C., Galindo-Uribarri, A., Garvey, G. T., Gautam, S., Gilje, K. E., Gonzalez-Garcia, M., Goodman, M. C., Gordon, H., Gramellini, E., Green, M. P., Guglielmi, A., Hackenburg, R. W., Hackenburg, A., Halzen, F., Han, K., Hans, S., Harris, D., Heeger, K. M., Herman, M., Hill, R., Holin, A., Huber, P., Jaffe, D. E., Johnson, R. A., Joshi, J., Karagiorgi, G., Kaufman, L. J., Kayser, B., Kettell, S. H., Kirby, B. J., Klein, J. R., Kolomensky, Yu. G., Kriske, R. M., Lane, C. E., Langford, T. J., Lankford, A., Lau, K., Learned, J. G., Ling, J., Link, J. M., Lissauer, D., Littenberg, L., Littlejohn, B. R., Lockwitz, S., Lokajicek, M., Louis, W. C., Luk, K., Lykken, J., Marciano, W. J., Maricic, J., Markoff, D. M., Caicedo, D. A. Martinez, Mauger, C., Mavrokoridis, K., McCluskey, E., McKeen, D., McKeown, R., Mills, G., Mocioiu, I., Monreal, B., Mooney, M. R., Morfin, J. G., Mumm, P., Napolitano, J., Neilson, R., Nelson, J. K., Nessi, M., Norcini, D., Nova, F., Nygren, D. R., Gann, G. D. Orebi, Palamara, O., Parsa, Z., Patterson, R., Paul, P., Pocar, A., Qian, X., Raaf, J. L., Rameika, R., Ranucci, G., Ray, H., Reyna, D., Rich, G. C., Rodrigues, P., Romero, E. Romero, Rosero, R., Rountree, S. D., Rybolt, B., Sanchez, M. C., Santucci, G., Schmitz, D., Scholberg, K., Seckel, D., Shaevitz, M., Shrock, R., Smy, M. B., Soderberg, M., Sonzogni, A., Sousa, A. B., Spitz, J., John, J. M. St., Stewart, J., Strait, J. B., Sullivan, G., Svoboda, R., Szelc, A. M., Tayloe, R., Thomson, M. A., Toups, M., Vacheret, A., Vagins, M., Van de Water, R. G., Vogelaar, R. B., Weber, M., Weng, W., Wetstein, M., White, C., White, B. R., Whitehead, L., Whittington, D. W., Wilking, M. J., Wilson, R. J., Wilson, P., Winklehner, D., Winn, D. R., Worcester, E., Yang, L., Yeh, M., Yokley, Z. W., Yoo, J., Yu, B., Yu, J., and Zhang, C.

Subjects
High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The US neutrino community gathered at the Workshop on the Intermediate Neutrino Program (WINP) at Brookhaven National Laboratory February 4-6, 2015 to explore opportunities in neutrino physics over the next five to ten years. Scientists from particle, astroparticle and nuclear physics participated in the workshop. The workshop examined promising opportunities for neutrino physics in the intermediate term, including possible new small to mid-scale experiments, US contributions to large experiments, upgrades to existing experiments, R&D plans and theory. The workshop was organized into two sets of parallel working group sessions, divided by physics topics and technology. Physics working groups covered topics on Sterile Neutrinos, Neutrino Mixing, Neutrino Interactions, Neutrino Properties and Astrophysical Neutrinos. Technology sessions were organized into Theory, Short-Baseline Accelerator Neutrinos, Reactor Neutrinos, Detector R&D and Source, Cyclotron and Meson Decay at Rest sessions.This report summarizes discussion and conclusions from the workshop., Comment: pdfLaTeX, 31 pages, 1 figure, minor modification to 0nuBB discussion

Published
2015

43. Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 8: Instrumentation Frontier

Author

Demarteau, M., Lipton, R., Nicholson, H., Shipsey, I., Akerib, D., Albayrak-Yetkin, A., Alexander, J., Anderson, J., Artuso, M., Asner, D., Ball, R., Battaglia, M., Bebek, C., Beene, J., Benhammou, Y., Bentefour, E., Bergevin, M., Bernstein, A., Bilki, B., Blucher, E., Bolla, G., Bortoletto, D., Bowden, N., Brooijmans, G., Byrum, K., Cabrera, B., Cancelo, G., Carlstrom, J., Casey, B., Chang, C., Chapman, J., Chen, C. H., Childres, I., Christian, D., Convery, M., Corso, W. Cooper J., Cumalat, J., Cushman, P., Da Via, C., Dazeley, S., Debbins, P., Deptuch, G., Dhawan, S., Di Benedetto, V., DiGiovene, B., Djurcic, Z., Dye, S., Elagin, A., Estrada, J., Evans, H., Etzion, E., Fast, J., Ferretti, C., Fisher, P., Fleming, B., Francis, K., Friedman, P., Frisch, H., Garcia-Sciveres, M., Gatto, C., Geronim, G., Gilchriese, G., Golwala, S., Grant, C., Grillo, A., Grünendahl, E., Gorham, P., Guan, L., Gutierrez, G., Haber, C., Hall, J., Haller, G., Hast, C., Heintz, U., Hemmick, T., Hitlin, D. G., Hogan, C., Hohlmann, M., Hoppe, E., Hsu, L., Huffer, M., Irwin, K., Izraelevitch, F., Jennings, G., Johnson, M., Jung, A., Kagan, H., Kenney, C., Kettell, S., Khanna, R., Khristenko, V., Krennrich, F., Kuehn, K., Kutschke, R., Learned, J., Lee, A. T., Levin, D., Liu, T., Liu, A. T. K., Lissauer, D., Love, J., Lynn, D., MacFarlane, D., Magill, S., Majewski, S., Mans, J., Maricic, J., Marleau, P., Mazzacane, A., McKinsey, D., Mehl, J., Mestvirisvilli, A., Meyer, S., Mokhov, N., Moshe, M., Mukherjee, A., Murat, P., Nahn, S., Narain, M., Nadel-Turonski, P., Newcomer, M., Nishimura, K., Nygren, D., Oberla, E., Onel, Y., Oreglia, M., Orrell, J., Paley, J., Para, A., Parker, S., Polychronakos, V., Pordes, S., Privitera, P., Prosser, A., Pyle, M., Raaf, J., Ramberg, E., Rameika, R., Rebel, B., Repond, J., Reyna, D., Ristori, L., Rivera, R., Ronzhin, A., Rusack, R., Russ, J., Ryd, A., Sadrozinski, H., Sahoo, H., Sanchez, M. C., Sanzeni, C., Schnetzer, S., Seidel, S., Seiden, A., Schmidt, I., Shenai, A., Shutt, T., Silver, Y., Smith, W., Snowden-Ifft, D., Sonnenschein, A., Southwick, D., Spiegel, L., Stanitzki, M., Striganov, S., Su, D., Sumner, R., Svoboda, R., Sweany, M., Talaga, R., Tayloe, R., Tentindo, S., Terentiev, N., Thom-Levy, J., Thorn, C., Tiffenberg, J., Trischuk, W., Tschirhart, R., Turner, M., Underwood, D., Uplegger, L., Urheim, J., Vagins, M., Van Bibber, K., Varner, G., Varner, R., Va'vra, J., Von der Lippe, H., Wagner, R., Wagner, S., Weaverdyck, C., Wenzel, H., Weinstein, A., Wetstein, M., White, A., Wigman, R., Wilson, P., Winn, D., Winter, P., Woody, C., Xia, L., Xie, J. Q., Ye, Z., Yeh, M. F., Yetkin, T., Yoo, J. H., Yu, J., Yu, J. M., Zeller, S., Zhang, J. L., Zhu, J. J., Zhou, B., Zhu, R. Y., and Zitzer, B.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
Abstract

These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 8, on the Instrumentation Frontier, discusses the instrumentation needs of future experiments in the Energy, Intensity, and Cosmic Frontiers, promising new technologies for particle physics research, and issues of gathering resources for long-term research in this area., Comment: 50 pages

Published
2014

44. The Intermediate Neutrino Program

Author

Adams, C, Alonso, JR, Ankowski, AM, Asaadi, JA, Ashenfelter, J, Axani, SN, Babu, K, Backhouse, C, Band, HR, Barbeau, PS, Barros, N, Bernstein, A, Betancourt, M, Bishai, M, Blucher, E, Bouffard, J, Bowden, N, Brice, S, Bryan, C, Camilleri, L, Cao, J, Carlson, J, Carr, RE, Chatterjee, A, Chen, M, Chen, S, Chiu, M, Church, ED, Collar, JI, Collin, G, Conrad, JM, Convery, MR, Cooper, RL, Cowen, D, Davoudiasl, H, Gouvea, A De, Dean, DJ, Deichert, G, Descamps, F, DeYoung, T, Diwan, MV, Djurcic, Z, Dolinski, MJ, Dolph, J, Donnelly, B, Dwyer, DA, Dytman, S, Efremenko, Y, Everett, LL, Fava, A, Figueroa-Feliciano, E, Fleming, B, Friedland, A, Fujikawa, BK, Gaisser, TK, Galeazzi, M, Galehouse, DC, Galindo-Uribarri, A, Garvey, GT, Gautam, S, Gilje, KE, Gonzalez-Garcia, M, Goodman, MC, Gordon, H, Gramellini, E, Green, MP, Guglielmi, A, Hackenburg, RW, Hackenburg, A, Halzen, F, Han, K, Hans, S, Harris, D, Heeger, KM, Herman, M, Hill, R, Holin, A, Huber, P, Jaffe, DE, Johnson, RA, Joshi, J, Karagiorgi, G, Kaufman, LJ, Kayser, B, Kettell, SH, Kirby, BJ, Klein, JR, Kolomensky, Yu G, Kriske, RM, Lane, CE, Langford, TJ, Lankford, A, Lau, K, Learned, JG, Ling, J, Link, JM, Lissauer, D, Littenberg, L, Littlejohn, BR, and Lockwitz, S

Subjects
hep-ex, nucl-ex, physics.ins-det
Abstract

The US neutrino community gathered at the Workshop on the IntermediateNeutrino Program (WINP) at Brookhaven National Laboratory February 4-6, 2015 toexplore opportunities in neutrino physics over the next five to ten years.Scientists from particle, astroparticle and nuclear physics participated in theworkshop. The workshop examined promising opportunities for neutrino physics inthe intermediate term, including possible new small to mid-scale experiments,US contributions to large experiments, upgrades to existing experiments, R&Dplans and theory. The workshop was organized into two sets of parallel workinggroup sessions, divided by physics topics and technology. Physics workinggroups covered topics on Sterile Neutrinos, Neutrino Mixing, NeutrinoInteractions, Neutrino Properties and Astrophysical Neutrinos. Technologysessions were organized into Theory, Short-Baseline Accelerator Neutrinos,Reactor Neutrinos, Detector R&D and Source, Cyclotron and Meson Decay at Restsessions.This report summarizes discussion and conclusions from the workshop.

Published
2015

45. Neutrinos

Author

de Gouvea, A., Pitts, K., Scholberg, K., Zeller, G. P., Alonso, J., Bernstein, A., Bishai, M., Elliott, S., Heeger, K., Hoffman, K., Huber, P., Kaufman, L. J., Kayser, B., Link, J., Lunardini, C., Monreal, B., Morfin, J. G., Robertson, H., Tayloe, R., Tolich, N., Abazajian, K., Akiri, T., Albright, C., Asaadi, J., Babu, K. S, Balantekin, A. B., Barbeau, P., Bass, M., Blake, A., Blondel, A., Blucher, E., Bowden, N., Brice, S. J., Bross, A., Carls, B., Cavanna, F., Choudhary, B., Coloma, P., Connolly, A., Conrad, J., Convery, M., Cooper, R. L., Cowen, D., da Motta, H., de Young, T., Di Lodovico, F., Diwan, M., Djurcic, Z., Dracos, M., Dodelson, S., Efremenko, Y., Ekelof, T., Feng, J. L., Fleming, B., Formaggio, J., Friedland, A., Fuller, G., Gallagher, H., Geer, S., Gilchriese, M., Goodman, M., Grant, D., Gratta, G., Hall, C., Halzen, F., Harris, D., Heffner, M., Henning, R., Hewett, J. L., Hill, R., Himmel, A., Horton-Smith, G., Karle, A., Katori, T., Kearns, E., Kettell, S., Klein, J., Kim, Y., Kim, Y. K., Kolomensky, Yu., Kordosky, M., Kudenko, Yu., Kudryavtsev, V. A., Lande, K., Lang, K., Lanza, R., Lau, K., Lee, H., Li, Z., Littlejohn, B. R., Lin, C. J., Liu, D., Liu, H., Long, K., Louis, W., Luk, K. B., Marciano, W., Mariani, C., Marshak, M., Mauger, C., McDonald, K. T., McFarland, K., McKeown, R., Messier, M., Mishra, S. R., Mosel, U., Mumm, P., Nakaya, T., Nelson, J. K., Nygren, D., Gann, G. D. Orebi, Osta, J., Palamara, O., Paley, J., Papadimitriou, V., Parke, S., Parsa, Z., Patterson, R., Piepke, A., Plunkett, R., Poon, A., Qian, X., Raaf, J., Rameika, R., Ramsey-Musolf, M., Rebel, B., Roser, R., Rosner, J., Rott, C., Rybka, G., Sahoo, H., Sangiorgio, S., Schmitz, D., Shrock, R., Shaevitz, M., Smith, N., Smy, M., Sobel, H., Sorensen, P., Sousa, A., Spitz, J., Strauss, T., Svoboda, R., Tanaka, H. A., Thomas, J., Tian, X., Tschirhart, R., Tully, C., Van Bibber, K., Van de Water, R. G., Vahle, P., Vogel, P., Walter, C. W., Wark, D., Wascko, M., Webber, D., Weerts, H., White, C., White, H., Whitehead, L., Wilson, R. J., Winslow, L., Wongjirad, T, Worcester, E., Yokoyama, M., Yoo, J., and Zimmerman, E. D.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

This document represents the response of the Intensity Frontier Neutrino Working Group to the Snowmass charge. We summarize the current status of neutrino physics and identify many exciting future opportunities for studying the properties of neutrinos and for addressing important physics and astrophysics questions with neutrinos., Comment: Report of the Community Summer Study 2013 (Snowmass) Intensity Frontier Neutrino Working Group

Published
2013

46. PROSPECT - A Precision Reactor Oscillation and Spectrum Experiment at Short Baselines

Author

Ashenfelter, J., Balantekin, A. B., Band, H. R., Barclay, G., Bass, C., Bowden, N. S., Bryan, C. D., Cherwinka, J. J., Chu, R., Classen, T., Davee, D., Dean, D., Deichert, G., Diwan, M., Dolinski, M. J., Dolph, J., Dwyer, D. A., Efremenko, Y., Fan, S., Galindo-Uribarri, A., Gilje, K., Glenn, A., Green, M., Han, K., Hans, S., Heeger, K. M., Heffron, B., Hu, L., Huber, P., Jaffe, D. E., Kamyshkov, Y., Kettell, S., Lane, C., Langford, T. J., Littlejohn, B. R., Martinez, D., McKeown, R. D., Mendenhall, M. P., Morrell, S., Mueller, P., Mumm, H. P., Napolitano, J., Nico, J. S., Norcini, D., Pushin, D., Qian, X., Romero, E., Rosero, R., Seilhan, B. S., Sharma, R., Surukuchi, P. T., Thompson, S. J., Varner, R. L., Viren, B., Wang, W., White, B., White, C., Wilhelmi, J., Williams, C., Williams, R. E., Wise, T., Yao, H., Yeh, M., Zaitseva, N., Zhang, C., and Zhang, X.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

Current models of antineutrino production in nuclear reactors predict detection rates and spectra at odds with the existing body of direct reactor antineutrino measurements. High-resolution antineutrino detectors operated close to compact research reactor cores can produce new precision measurements useful in testing explanations for these observed discrepancies involving underlying nuclear or new physics. Absolute measurement of the 235U-produced antineutrino spectrum can provide additional constraints for evaluating the accuracy of current and future reactor models, while relative measurements of spectral distortion between differing baselines can be used to search for oscillations arising from the existence of eV-scale sterile neutrinos. Such a measurement can be performed in the United States at several highly-enriched uranium fueled research reactors using near-surface segmented liquid scintillator detectors. We describe here the conceptual design and physics potential of the PROSPECT experiment, a U.S.-based, multi-phase experiment with reactor-detector baselines of 7-20 meters capable of addressing these and other physics and detector development goals. Current R&D status and future plans for PROSPECT detector deployment and data-taking at the High Flux Isotope Reactor at Oak Ridge National Laboratory will be discussed., Comment: White paper prepared for Snowmass-2013; Updated to reflect experimental status as of January 2015. 18 pages, 12 figures

Published
2013

47. First Measurement of \theta_13 from Delayed Neutron Capture on Hydrogen in the Double Chooz Experiment

Author

Double Chooz Collaboration, Abe, Y., Aberle, C., Anjos, J. C. dos, Barriere, J. C., Bergevin, M., Bernstein, A., Bezerra, T. J. C., Bezrukhov, L., Blucher, E., Bowden, N. S., Buck, C., Busenitz, J., Cabrera, A., Caden, E., Camilleri, L., Carr, R., Cerrada, M., Chang, P. -J., Chimenti, P., Classen, T., Collin, A. P., Conover, E., Conrad, J. M., Crespo-Anadón, J. I., Crum, K., Cucoanes, A., Damon, E., Dawson, J. V., Dazeley, S., Dietrich, D., Djurcic, Z., Dracos, M., Durand, V., Ebert, J., Efremenko, Y., Elnimr, M., Erickson, A., Etenko, A., Fallot, M., Fechner, M., von Feilitzsch, F., Felde, J., Fernandes, S. M., Fischer, V., Franco, D., Franke, A. J., Franke, M., Furuta, H., Gama, R., Gil-Botella, I., Giot, L., Göger-Neff, M., Gonzalez, L. F. G., Goodenough, L., Goodman, M. C., Goon, J. TM., Greiner, D., Haag, N., Habib, S., Hagner, C., Hara, T., Hartmann, F. X., Haser, J., Hatzikoutelis, A., Hayakawa, T., Hofmann, M., Horton-Smith, G. A., Hourlier, A., Ishitsuka, M., Jochum, J., Jollet, C., Jones, C. L., Kaether, F., Kalousis, L. N., Kamyshkov, Y., Kaplan, D. M., Kawasaki, T., Keefer, G., Kemp, E., de Kerret, H., Konno, T., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C. E., Langbrandtner, C., Lasserre, T., Letourneau, A., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B. K., Lucht, S., McKee, D., Maeda, J., Maesano, C. N., Mariani, C., Maricic, J., Martino, J., Matsubara, T., Mention, G., Meregaglia, A., Meyer, M., Miletic, T., Milincic, R., Miyata, H., Mueller, Th. A., Nagasaka, Y., Nakajima, K., Novella, P., Obolensky, M., Oberauer, L., Onillon, A., Osborn, A., Ostrovskiy, I., Palomares, C., Pepe, I. M., Perasso, S., Perrin, P., Pfahler, P., Porta, A., Potzel, W., Pronost, G., Reichenbacher, J., Reinhold, B., Remoto, A., Röhling, M., Roncin, R., Roth, S., Rybolt, B., Sakamoto, Y., Santorelli, R., Sato, F., Schönert, S., Schoppmann, S., Schwetz, T., Shaevitz, M. H., Shimojima, S., Shrestha, D., Sida, J-L., Sinev, V., Skorokhvatov, M., Smith, E., Spitz, J., Stahl, A., Stancu, I., Stokes, L. F. F., Strait, M., Stüken, A., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Svoboda, R., Terao, K., Tonazzo, A., Toups, M., Thi, H. H. Trinh, Valdiviesso, G., Veyssiere, C., Wagner, S., Watanabe, H., White, B., Wiebusch, C., Winslow, L., Worcester, M., Wurm, M., Yermia, F., and Zimmer, V.

Subjects
High Energy Physics - Experiment
Abstract

The Double Chooz experiment has determined the value of the neutrino oscillation parameter $\theta_{13}$ from an analysis of inverse beta decay interactions with neutron capture on hydrogen. This analysis uses a three times larger fiducial volume than the standard Double Chooz assessment, which is restricted to a region doped with gadolinium (Gd), yielding an exposure of 113.1 GW-ton-years. The data sample used in this analysis is distinct from that of the Gd analysis, and the systematic uncertainties are also largely independent, with some exceptions, such as the reactor neutrino flux prediction. A combined rate- and energy-dependent fit finds $\sin^2 2\theta_{13}=0.097\pm 0.034(stat.) \pm 0.034 (syst.)$, excluding the no-oscillation hypothesis at 2.0 \sigma. This result is consistent with previous measurements of $\sin^2 2\theta_{13}$., Comment: 6 pages, 2 figures; published version

Published
2013
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48. Direct Measurement of Backgrounds using Reactor-Off Data in Double Chooz

Author

Abe, Y., Aberle, C., Anjos, J. C. dos, Barriere, J. C., Bergevin, M., Bernstein, A., Bezerra, T. J. C., Bezrukhov, L., Blucher, E., Bowden, N. S., Buck, C., Busenitz, J., Cabrera, A., Caden, E., Camilleri, L., Carr, R., Cerrada, M., Chang, P. -J., Chimenti, P., Classen, T., Collin, A. P., Conover, E., Conrad, J. M., Crespo-Anadon, J. I., Crum, K., Cucoanes, A., D'Agostino, M. V., Damon, E., Dawson, J. V., Dazeley, S., Dietrich, D., Djurcic, Z., Dracos, M., Durand, V., Ebert, J., Efremenko, Y., Elnimr, M., Erickson, A., Etenko, A., Fallot, M., Fechner, M., von Feilitzsch, F., Felde, J., Fernandes, S. M., Fischer, V., Franco, D., Franke, A. J., Franke, M., Furuta, H., Gama, R., Gil-Botella, I., Giot, L., Göger-Neff, M., Gonzalez, L. F. G., Goodenough, L., Goodman, M. C., Goon, J. TM., Greiner, D., Haag, N., Habib, S., Hagner, C., Hara, T., Hartmann, F. X., Haser, J., Hatzikoutelis, A., Hayakawa, T., Hofmann, M., Horton-Smith, G. A., Hourlier, A., Ishitsuka, M., Jochum, J., Jollet, C., Jones, C. L., Kaether, F., Kalousis, L. N., Kamyshkov, Y., Kaplan, D. M., Kawasaki, T., Keefer, G., Kemp, E., de Kerret, H., Kibe, Y., Konno, T., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C. E., Langbrandtner, C., Lasserre, T., Letourneau, A., Lhuillier, D., Lima Jr, H. P., Lindner, M., Lopez-Castano, J. M., LoSecco, J. M., Lubsandorzhiev, B. K., Lucht, S., McKee, D., Maeda, J., Maesano, C. N., Mariani, C., Maricic, J., Martino, J., Matsubara, T., Mention, G., Meregaglia, A., Meyer, M., Miletic, T., Milincic, R., Miyata, H., Mueller, Th. A., Nagasaka, Y., Nakajima, K., Novella, P., Obolensky, M., Oberauer, L., Onillon, A., Osborn, A., Ostrovskiy, I., Palomares, C., Pepe, I. M., Perasso, S., Perrin, P., Pfahler, P., Porta, A., Potzel, W., Pronost, G., Reichenbacher, J., Reinhold, B., Remoto, A., Röhling, M., Roncin, R., Roth, S., Rybolt, B., Sakamoto, Y., Santorelli, R., Sato, F., Schönert, S., Schoppmann, S., Schwetz, T., Shaevitz, M. H., Shimojima, S., Shrestha, D., Sida, J-L., Sinev, V., Skorokhvatov, M., Smith, E., Spitz, J., Stahl, A., Stancu, I., Stokes, L. F. F., Strait, M., Stüken, A., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Svoboda, R., Terao, K., Tonazzo, A., Toups, M., Thi, H. H. Trinh, Valdiviesso, G., Veyssiere, C., Wagner, S., Watanabe, H., White, B., Wiebusch, C., Winslow, L., Worcester, M., Wurm, M., Yermia, F., and Zimmer, V.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Double Chooz is unique among modern reactor-based neutrino experiments studying $\bar \nu_e$ disappearance in that data can be collected with all reactors off. In this paper, we present data from 7.53 days of reactor-off running. Applying the same selection criteria as used in the Double Chooz reactor-on oscillation analysis, a measured background rate of 1.0$\pm$0.4 events/day is obtained. The background model for accidentals, cosmogenic $\beta$-$n$-emitting isotopes, fast neutrons from cosmic muons, and stopped-$\mu$ decays used in the oscillation analysis is demonstrated to be correct within the uncertainties. Kinematic distributions of the events, which are dominantly cosmic-ray-produced correlated-background events, are provided. The background rates are scaled to the shielding depths of two other reactor-based oscillation experiments, Daya Bay and RENO., Comment: V2 has corrections to affiliations

Published
2012
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49. First Test of Lorentz Violation with a Reactor-based Antineutrino Experiment

Author

Double Chooz Collaboration, Abe, Y., Aberle, C., Anjos, J. C. dos, Bergevin, M., Bernstein, A., Bezerra, T. J. C., Bezrukhov, L., Blucher, E., Bowden, N. S., Buck, C., Busenitz, J., Cabrera, A., Caden, E., Camilleri, L., Carr, R., Cerrada, M., Chang, P. -J., Chimenti, P., Classen, T., Collin, A. P., Conover, E., Conrad, J. M., Crespo-Anadón, J. I., Crum, K., Cucoanes, A., D'Agostino, M. V., Damon, E., Dawson, J. V., Dazeley, S., Dietrich, D., Djurcic, Z., Dracos, M., Durand, V., Ebert, J., Efremenko, Y., Elnimr, M., Erickson, A., Fallot, M., Fechner, M., von Feilitzsch, F., Felde, J., Fischer, V., Franco, D., Franke, A. J., Franke, M., Furuta, H., Gama, R., Gil-Botella, I., Giot, L., Göger-Neff, M., Gonzalez, L. F. G., Goodman, M. C., Goon, J. TM., Greiner, D., Haag, N., Habib, S., Hagner, C., Hara, T., Hartmann, F. X., Haser, J., Hatzikoutelis, A., Hayakawa, T., Hofmann, M., Horton-Smith, G. A., Ishitsuka, M., Jochum, J., Jollet, C., Jones, C. L., Kaether, F., Kalousis, L. N., Kamyshkov, Y., Kaplan, D. M., Katori, T., Kawasaki, T., Keefer, G., Kemp, E., de Kerret, H., Konno, T., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C. E., Lasserre, T., Letourneau, A., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B. K., Lucht, S., McKee, D., Maeda, J., Maesano, C. N., Mariani, C., Maricic, J., Martino, J., Matsubara, T., Mention, G., Meregaglia, A., Meyer, M., Miletic, T., Milincic, R., Miyata, H., Mueller, Th. A., Nagasaka, Y., Nakajima, K., Novella, P., Obolensky, M., Oberauer, L., Onillon, A., Osborn, A., Ostrovskiy, I., Palomares, C., Pepe, I. M., Perasso, S., Perrin, P., Pfahler, P., Porta, A., Potzel, W., Pronost, G., Reichenbacher, J., Reinhold, B., Remoto, A., Röhling, M., Roncin, R., Roth, S., Rybolt, B., Sakamoto, Y., Santorelli, R., Sato, F., Schönert, S., Schoppmann, S., Schwetz, T., Shaevitz, M. H., Shrestha, D., Sida, J. -L., Sinev, V., Skorokhvatov, M., Smith, E., Spitz, J., Stahl, A., Stancu, I., Stokes, L. F. F., Strait, M., Stüken, A., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Terao, K., Tonazzo, A., Toups, M., Thi, H. H. Trinh, Valdiviesso, G., Veyssiere, C., Wagner, S., Watanabe, H., White, B., Wiebusch, C., Winslow, L., Worcester, M., Wurm, M., Yanovitch, E., Yermia, F., and Zimmer, V.

Subjects
High Energy Physics - Experiment
Abstract

We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring a search for a sidereal time dependence of the events, is the first test of Lorentz invariance using a reactor-based antineutrino source. No sidereal variation is present in the data and the disappearance results are consistent with sidereal time independent oscillations. Under the Standard-Model Extension (SME), we set the first limits on fourteen Lorentz violating coefficients associated with transitions between electron and tau flavor, and set two competitive limits associated with transitions between electron and muon flavor., Comment: 6 pages, 2 figures; (new version after referee's comments)

Published
2012
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50. Reactor electron antineutrino disappearance in the Double Chooz experiment

Author

Abe, Y., Aberle, C., Anjos, J. C. dos, Barriere, J. C., Bergevin, M., Bernstein, A., Bezerra, T. J. C., Bezrukhov, L., Blucher, E., Bowden, N. S., Buck, C., Busenitz, J., Cabrera, A., Caden, E., Camilleri, L., Carr, R., Cerrada, M., Chang, P. -J., Chimenti, P., Classen, T., Collin, A. P., Conover, E., Conrad, J. M., Crespo-Anadón, J. I., Crum, K., Cucoanes, A., D'Agostino, M. V., Damon, E., Dawson, J. V., Dazeley, S., Dietrich, D., Djurcic, Z., Dracos, M., Durand, V., Ebert, J., Efremenko, Y., Elnimr, M., Etenko, A., Fallot, M., Fechner, M., von Feilitzsch, F., Felde, J., Franco, D., Franke, A. J., Franke, M., Furuta, H., Gama, R., Gil-Botella, I., Giot, L., Goger-Neff, M., Gonzalez, L. F. G., Goodman, M. C., Goon, J. TM., Greiner, D., Haag, N., Hagner, C., Hara, T., Hartmann, F. X., Haser, J., Hatzikoutelis, A., Hayakawa, T., Hofmann, M., Horton-Smith, G. A., Hourlier, A., Ishitsuka, M., Jochum, J., Jollet, C., Jones, C. L., Kaether, F., Kalousis, L. N., Kamyshkov, Y., Kaplan, D. M., Kawasaki, T., Keefer, G., Kemp, E., de Kerret, H., Kibe, Y., Konno, T., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C. E., Langbrandtner, C., Lasserre, T., Letourneau, A., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castanõ, J. M., LoSecco, J. M., Lubsandorzhiev, B. K., Lucht, S., McKee, D., Maeda, J., Maesano, C. N., Mariani, C., Maricic, J., Martino, J., Matsubara, T., Mention, G., Meregaglia, A., Miletic, T., Milincic, R., Miyata, H., Mueller, Th. A., Nagasaka, Y., Nakajima, K., Novella, P., Obolensky, M., Oberauer, L., Onillon, A., Osborn, A., Ostrovskiy, I., Palomares, C., Pepe, I. M., Perasso, S., Perrin, P., Pfahler, P., Porta, A., Potzel, W., Reichenbacher, J., Reinhold, B., Remoto, A., Rohling, M., Roncin, R., Roth, S., Sakamoto, Y., Santorelli, R., Sato, F., Schonert, S., Schoppmann, S., Schwetz, T., Shaevitz, M. H., Shimojima, S., Shrestha, D., Sida, J. -L., Sinev, V., Skorokhvatov, M., Smith, E., Spitz, J., Stahl, A., Stancu, I., Stokes, L. F. F., Strait, M., Stuken, A., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Svoboda, R., Terao, K., Tonazzo, A., Toups, M., Thi, H. H. Trinh, Valdiviesso, G., Veyssiere, C., Wagner, S., Watanabe, H., White, B., Wiebusch, C., Winslow, L., Worcester, M., Wurm, M., Yermia, F., and Zimmer, V.

Subjects
High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

The Double Chooz experiment has observed 8,249 candidate electron antineutrino events in 227.93 live days with 33.71 GW-ton-years (reactor power x detector mass x livetime) exposure using a 10.3 cubic meter fiducial volume detector located at 1050 m from the reactor cores of the Chooz nuclear power plant in France. The expectation in case of theta13 = 0 is 8,937 events. The deficit is interpreted as evidence of electron antineutrino disappearance. From a rate plus spectral shape analysis we find sin^2 2{\theta}13 = 0.109 \pm 0.030(stat) \pm 0.025(syst). The data exclude the no-oscillation hypothesis at 99.8% CL (2.9{\sigma})., Comment: Modified for PRD referees

Published
2012
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