# Antineutrino - Explore the Science & Experts | ideXlab

## Antineutrino

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### H R Band – One of the best experts on this subject based on the ideXlab platform.

• ##### improved short baseline neutrino oscillation search and energy spectrum measurement with the prospect experiment at hfir
arXiv: High Energy Physics – Experiment, 2020
Co-Authors: M Andriamirado, N S Bowden, A B Balantekin, H R Band, C D Bass, Denis E Bergeron, D Berish, J P Brodsky, C D Bryan, T Classen

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.

• ##### extraction of the 235 u and 239 pu Antineutrino spectra at daya bay
Physical Review Letters, 2019
Co-Authors: D Adey, A B Balantekin, H R Band, M Bishai, S Blyth, G F Cao, J Cao, D Cao, J F Chang, Y Chang

Abstract:

This Letter reports the first extraction of individual Antineutrino spectra from ^{235}U and ^{239}Pu fission and an improved measurement of the prompt energy spectrum of reactor Antineutrinos at Daya Bay. The analysis uses 3.5×10^{6} inverse beta-decay candidates in four near Antineutrino detectors in 1958 days. The individual Antineutrino spectra of the two dominant isotopes, ^{235}U and ^{239}Pu, are extracted using the evolution of the prompt spectrum as a function of the isotope fission fractions. In the energy window of 4-6 MeV, a 7% (9%) excess of events is observed for the ^{235}U (^{239}Pu) spectrum compared with the normalized Huber-Mueller model prediction. The significance of discrepancy is 4.0σ for ^{235}U spectral shape compared with the Huber-Mueller model prediction. The shape of the measured inverse beta-decay prompt energy spectrum disagrees with the prediction of the Huber-Mueller model at 5.3σ. In the energy range of 4-6 MeV, a maximal local discrepancy of 6.3σ is observed.

• ##### The PROSPECT Reactor Antineutrino Experiment
Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 2019
Co-Authors: J. Ashenfelter, N S Bowden, A B Balantekin, H R Band, C D Bass, Denis E Bergeron, D Berish, C. Baldenegro, L. J. Bignell, J. Boyle

Abstract:

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 7 m to 13 m from the High Flux Isotope Reactor core. It will probe the best-fit point of the ν e disappearance experiments at 4  σ in 1 year and the favored regions of the sterile neutrino parameter space at more than 3 σ in 3 years. PROSPECT will test the origin of spectral deviations observed in recent θ 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.

### A B Balantekin – One of the best experts on this subject based on the ideXlab platform.

• ##### improved short baseline neutrino oscillation search and energy spectrum measurement with the prospect experiment at hfir
arXiv: High Energy Physics – Experiment, 2020
Co-Authors: M Andriamirado, N S Bowden, A B Balantekin, H R Band, C D Bass, Denis E Bergeron, D Berish, J P Brodsky, C D Bryan, T Classen

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.

• ##### extraction of the 235 u and 239 pu Antineutrino spectra at daya bay
Physical Review Letters, 2019
Co-Authors: D Adey, A B Balantekin, H R Band, M Bishai, S Blyth, G F Cao, J Cao, D Cao, J F Chang, Y Chang

Abstract:

This Letter reports the first extraction of individual Antineutrino spectra from ^{235}U and ^{239}Pu fission and an improved measurement of the prompt energy spectrum of reactor Antineutrinos at Daya Bay. The analysis uses 3.5×10^{6} inverse beta-decay candidates in four near Antineutrino detectors in 1958 days. The individual Antineutrino spectra of the two dominant isotopes, ^{235}U and ^{239}Pu, are extracted using the evolution of the prompt spectrum as a function of the isotope fission fractions. In the energy window of 4-6 MeV, a 7% (9%) excess of events is observed for the ^{235}U (^{239}Pu) spectrum compared with the normalized Huber-Mueller model prediction. The significance of discrepancy is 4.0σ for ^{235}U spectral shape compared with the Huber-Mueller model prediction. The shape of the measured inverse beta-decay prompt energy spectrum disagrees with the prediction of the Huber-Mueller model at 5.3σ. In the energy range of 4-6 MeV, a maximal local discrepancy of 6.3σ is observed.

• ##### The PROSPECT Reactor Antineutrino Experiment
Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 2019
Co-Authors: J. Ashenfelter, N S Bowden, A B Balantekin, H R Band, C D Bass, Denis E Bergeron, D Berish, C. Baldenegro, L. J. Bignell, J. Boyle

Abstract:

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 7 m to 13 m from the High Flux Isotope Reactor core. It will probe the best-fit point of the ν e disappearance experiments at 4  σ in 1 year and the favored regions of the sterile neutrino parameter space at more than 3 σ in 3 years. PROSPECT will test the origin of spectral deviations observed in recent θ 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.

### Muriel Fallot – One of the best experts on this subject based on the ideXlab platform.

• ##### summation calculations for reactor Antineutrino spectra decay heat and delayed neutron fractions involving new tags data and evaluated databases
European Physical Journal Web of Conferences, 2019
Co-Authors: M Estienne, Muriel Fallot, Lydie Giot, V Guadillagomez, Le L Meur, A Porta, A Algora, J L Tain, Jose Antonio Briz

Abstract:

Three observables of interest for present and future reactors depend on the β decay properties of the fission products: Antineutrinos from reactors, the reactor decay heat and delayed neutron emission. In these proceedings, we present new results from summation calculations of the first two quantities quoted above, performed with evolved independent yields coupled with fission product decay data, from various nuclear data bases or models. New TAGS results from the latest experiment of the TAGS collaboration at the JYFL facility of Jyvaskyla will be displayed as well as their impact on the Antineutrino spectra and the decay heat associated to fission pulses of the main actinides.

• ##### The Detection of Reactor Antineutrinos for Reactor Core Monitoring: an Overview
Nuclear Data Sheets, 2014
Co-Authors: Muriel Fallot

Abstract:

Abstract There have been new developments in the field of applied neutrino physics during the last decade. The International Atomic Energy Agency (IAEA) has expressed interest in the potentialities of Antineutrino detection as a new tool for reactor monitoring and has created an ad hoc Working Group in late 2010 to follow the associated research and development. Several research projects are ongoing around the world to build Antineutrino detectors dedicated to reactor monitoring, to search for and develop innovative detection techniques, or to simulate and study the characteristics of the Antineutrino emission of actual and innovative nuclear reactor designs. We give, in these proceedings, an overview of the relevant properties of Antineutrinos, the possibilities of and limitations on their detection, and the status of the development of a variety of compact Antineutrino detectors for reactor monitoring.

• ##### Determination of the Sensitivity of the Antineutrino Probe for Reactor Core Monitoring
Nuclear Data Sheets, 2014
Co-Authors: S. Cormon, Muriel Fallot, Van Minh Bui, A. Cucoanes, Magali Estienne, M. Lenoir, A. Onillon, T. Shiba, F. Yermia, A.-a. Zakari-issoufou

Abstract:

This paper presents a feasibility study of the use of the detection of reactor-Antineutrinos View the MathML source(ν¯e) for non proliferation purpose. To proceed, we have started to study different reactor designs with our simulation tools. We use a package called MCNP Utility for Reactor Evolution (MURE), initially developed by CNRS/IN2P3 labs to study Generation IV reactors. The MURE package has been coupled to fission product beta decay nuclear databases for studying reactor Antineutrino emission. This method is the only one able to predict the Antineutrino emission from future reactor cores, which don’t use the thermal fission of 235U, 239Pu and 241Pu. It is also the only way to include off-equilibrium effects, due to neutron captures and time evolution of the fission product concentrations during a reactor cycle. We will present here the first predictions of Antineutrino energy spectra from innovative reactor designs (Generation IV reactors). We will then discuss a summary of our results of non-proliferation scenarios involving the latter reactor designs, taking into account reactor physics constraints.