, H.
, , D.
, Tyra, M.
, Nour, S.
and LaRosa, J.
(2019),
Measurement of the Antineutrino Spectrum from 235U Fission at HFIR with PROSPECT, Physics Review Letters, [online], https://dx.doi.org/10.1103/PhysRevLett.122.251801, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927291
(Accessed October 3, 2024)
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Measurement of the Antineutrino Spectrum from 235U Fission at HFIR with PROSPECT
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Abstract
This Letter reports the first measurement of the 235U e energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85MWth highly-enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678304 (stat.) e-induced inverse beta decays (IBD), the largest sample from HEU fission to date, 99% of which are attributed to 235U. Despite broad agreement, comparison of the Huber 235U model to the measured spectrum produces a 2=ndf = 51:4=31, driven primarily by deviations in two localized energy regions. The measured 235U spectrum shape is consistent with a deviation relative to prediction equal in size to that observed at low-enriched uranium power reactors in the e energy region of 5-7 MeV.Citation
Physics Review Letters
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Journals
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Keywords
antineutrino, 235U spectrum, neutrino-mixing, neutrino detector
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Created June 28, 2019, Updated May 3, 2021