Measurement of Electron Antineutrino Oscillation Amplitude and Frequency Via Neutron Capture on Hydrogen at Daya Bay

F. P. An,W. D. Bai，H. L. Zhuang,J. H. Zou

PHYSICAL REVIEW LETTERS（2024）

Cited 0|Views17

Abstract

This Letter reports the first measurement of the oscillation amplitude and frequency of reactor antineutrinos at Daya Bay via neutron capture on hydrogen using 1958 days of data. With over 3.6 million signal candidates, an optimized candidate selection, improved treatment of backgrounds and efficiencies, refined energy calibration, and an energy response model for the capture-on-hydrogen sensitive region, the relative (nu) over bar (e) rates and energy spectra variation among the near and far detectors gives sin(2)2 theta(13) = 0.0759(-0.0049)(+0.0050) and Delta m(32)(2) = (2.72(-0.15)(+0.14)) x 10(-3) eV(2) assuming the normal neutrino mass ordering, and Delta m(32)(2) = (-2.83(-0.14)(+0.15)) x 10(-3) eV(2) for the inverted neutrino mass ordering. This estimate of sin(2)2 theta(13) is consistent with and essentially independent from the one obtained using the capture-on-gadolinium sample at Daya Bay. The combination of these two results yields sin(2)2 theta(13) = 0.0833 +/- 0.0022, which represents an 8% relative improvement in precision regarding the Daya Bay full 3158-day capture-on-gadolinium result.

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Neutron Lifetime Measurement

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【要点】：本研究首次通过氢上中子捕获测量了反应堆反电子中微子的振荡幅度和频率，得出了sin²2θ₁₃和Δm₃²的精确值，并对中微子质量顺序进行了探讨。

【方法】：通过优化信号候选者选择、改进背景处理和效率、精炼能量校准以及针对氢上捕获敏感区域的能量响应模型，利用1958天的数据进行分析。

【实验】：利用Daya Bay实验的近探测器与远探测器，在3.6百万个信号候选者基础上，测量了相对反电子中微子速率和能量谱变化，得出了sin²2θ₁₃=0.0759_{-0.0049}^{+0.0050}和Δm₃²=2.72_{-0.15}^{+0.14}×10⁻³ eV²（正常质量顺序），以及Δm₃²=(-2.83_{-0.14}^{+0.15})×10⁻³ eV²（倒置质量顺序）。这些结果与Daya Bay实验的捕获-on-镓样本结果相结合，进一步提高了sin²2θ₁₃的测量精度。

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