arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.04085hep-exastro-ph.HEhep-phnucl-exnucl-th
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大气中微子在大型液体闪烁体探测器上引起的中性电流背景:II。现场测量方法

Neutral-current background induced by atmospheric neutrinos at large liquid-scintillator detectors: II. Methodology for in situ measurements

Jie Cheng, Yu-Feng Li, Hao-Qi Lu, Liang-Jian Wen

摘要:

未来的大型液体闪烁体探测器在寻找扩散超新星中微子背景和核子衰变方面与水-切伦科夫探测器既有竞争又有互补。在另一篇论文中,我们对LS探测器中大气中微子与$^{12}{\rm C}$核相互作用引起的中性流(NC)背景进行了系统的计算,这对扩散超新星中微子背景和核子衰变的实验研究至关重要。在本文中,我们进行了系统的研究,测量的NC背景和评估相关的不确定度。我们首先利用NC背景的特点,特别是,中子和π介子的多重性,以及可能与不稳定的残留核。事实证明,中子多重性分布是非常强大的区分不同的模型。然后,我们开发了一种最大似然方法,允许{ \it原位}测量NC相互作用与三重符合签名。最后,提出了一种数据驱动的方法来评估在寻找弥漫超新星中微子背景的NC背景的不确定性。我们认为,未来类似JUNO(江门地下中微子观测站)的大型LS实验将能够对全球数据集做出独特的贡献,以改善大气中微子NC对$^{12}$ C相互作用的预测。

英文摘要:

Future large liquid-scintillator (LS) detectors are competitive with and complementary to the water-Cherenkov detectors on the searches for diffuse supernova neutrino background and nucleon decay. In a companion paper, we have performed a systematic calculation of the neutral-current (NC) background induced by atmospheric neutrino interactions on $^{12}{\rm C}$ nuclei in LS detectors, which are expected to be crucially important for the experimental searches for the diffuse supernova neutrino background and nucleon decay. In this paper, we perform a systematic study on the measurement of the NC background and evaluate the associated uncertainties. We first exploit the characteristics of the NC background, in particular, the multiplicities of neutrons and pions, and the possible association with unstable residual nuclei. It turns out that the neutron multiplicity distribution is very powerful to discriminate among different models. Then, we develop a maximum-likelihood method to allow an {\it in situ} measurement of the NC interactions with a triple-coincidence signature. Finally, a data-driven approach is proposed to evaluate the uncertainty of the NC background in the search for the diffuse supernova neutrino background. We conclude that future large LS experiments like JUNO (Jiangmen Underground Neutrino Observatory) will be able to make a unique contribution to the worldwide data set to improve the prediction of atmospheric neutrino NC interactions on $^{12}$C.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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