Logo image
Back
Measurement of the Antineutrino Spectrum from $^{235}$U Fission at HFIR with PROSPECT
Preprint   Open access

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

PROSPECT Collaboration, J Ashenfelter, A. B Balantekin, H. R Band, C. D Bass, D. E Bergeron, D Berish, N. S Bowden, J. P Brodsky, C. D Bryan, …
arXiv.org
27 Dec 2018
DOI: https://doi.org/10.48550/arxiv.1812.10877
url
https://doi.org/10.48550/arxiv.1812.10877View
Preprint (Author's original)arXiv.org - Non-exclusive license to distribute,  Open

Abstract

Physics - High Energy Physics - Experiment Physics - Instrumentation and Detectors Physics - Nuclear Experiment
Phys. Rev. Lett. 122, 251801 (2019) 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.

Metrics

9 Record Views

Details

Logo image