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Preprint
Final Search for Short-Baseline Neutrino Oscillations with the PROSPECT-I Detector at HFIR
arXiv.org
14 Jun 2024
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.
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Details
- Title
- Final Search for Short-Baseline Neutrino Oscillations with the PROSPECT-I Detector at HFIR
- Creators
- M AndriamiradoB BalantekinC. D BassO. Benevides RodriguesE. P BernardN. S BowdenC. D BryanR CarrT ClassenA. J ConantG DeichertM. J DolinskiA EricksonA Galindo-UribarriS GokhaleC GrantS HansA. B HansellK. M HeegerB HeffronD. E JaffeS JayakumarJ. R KoblanskiP KunkleC. E LaneB. R LittlejohnA. Lozano SanchezX LuF MachadoJ MaricicM. P MendenhallA. M MeyerR MilincicP. E MuellerH MummR NeilsonX QianC RocaR RoseroP SurukuchiF SutantoD Venegas-VargasP. B WeatherlyJ WilhelmiM YehC ZhangX Zhang
- Publication Details
- arXiv.org
- Resource Type
- Preprint
- Language
- English
- Academic Unit
- Electrical and Computer Engineering; Physics
- Other Identifier
- 991021886940204721