Phys. Rev. Lett. 128, 081802 (2022) - Joint Measurement of the $^{235}\mathrm{U}$ Antineutrino Spectrum by PROSPECT and STEREO

Joint Measurement of the ${}^{235}U$ Antineutrino Spectrum by PROSPECT and STEREO

H. Almazán et al. (PROSPECT Collaboration, STEREO Collaboration)

Phys. Rev. Lett. 128, 081802 – Published 22 February 2022

Abstract

The PROSPECT and STEREO collaborations present a combined measurement of the pure ${}^{235}U$ antineutrino spectrum, without site specific corrections or detector-dependent effects. The spectral measurements of the two highest precision experiments at research reactors are found to be compatible with $χ^{2} / ndf = 24.1 / 21$ , allowing a joint unfolding of the prompt energy measurements into antineutrino energy. This ${\bar{ν}}_{e}$ energy spectrum is provided to the community, and an excess of events relative to the Huber model is found in the 5–6 MeV region. When a Gaussian bump is fitted to the excess, the data-model $χ^{2}$ value is improved, corresponding to a $2.4 σ$ significance.

Received 5 July 2021
Accepted 23 December 2021

DOI:https://doi.org/10.1103/PhysRevLett.128.081802

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Fission Neutrino interactions Nuclear reactors

Neutrino detection Scintillators

Nuclear PhysicsParticles & Fields

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See Also

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

F. P. An et al. (Daya Bay Collaboration["id", "col1"], PROSPECT Collaboration["id", "col2"])

Phys. Rev. Lett. 128, 081801 (2022)

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Vol. 128, Iss. 8 — 25 February 2022

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