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Evidence of Antineutrinos from Distant Reactors Using Pure Water at SNO+

Physical Review Letters(2023)

Queens Univ | Lab Instrumentacao & Fis Expt Particulas LIP | Univ Calif Berkeley | Univ Alberta | Univ Penn | Laurentian Univ | Univ Sussex | Univ Oxford | Univ Chicago | Tech Univ Dresden | Kings Coll London | SNOLAB | Boston Univ | Univ Nacl Autonoma Mexico | TRIUMF | Univ Lancaster | Univ Liverpool | Queen Mary Univ London | Univ Calif Davis | Brookhaven Natl Lab | MTA Atomki

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Abstract
The SNO+ Collaboration reports the first evidence of reactor antineutrinos in a Cherenkov detector. The nearest nuclear reactors are located 240 km away in Ontario, Canada. This analysis uses events with energies lower than in any previous analysis with a large water Cherenkov detector. Two analytical methods are used to distinguish reactor antineutrinos from background events in 190 days of data and yield consistent evidence for antineutrinos with a combined significance of 3.5σ.
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Neutrino Detection,Neutron Detection,Reactor Antineutrinos,Semiconductor Thermal Neutron Detectors,Scintillation Detectors
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要点】:SNO+合作组在纯水Cherenkov探测器中首次发现远离反应堆的反中微子证据,使用比先前任何大型水Cherenkov探测器分析的能量都低的事件,通过两种分析方法在190天的数据分析中区分出反应堆反中微子与背景事件,得出反中微子的3.5$\sigma$的组合显著性证据。

方法】:本研究采用两种分析方法来区分反应堆反中微子与背景事件。

实验】:实验在SNO+探测器中进行,使用190天的事件数据集,最终得出反中微子的存在具有3.5$\sigma$的统计显著性。