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arXiv 2102.12259hep-phhep-ex
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在锦屏中微子实验上探测中微子磁矩

Probing neutrino magnetic moment at the Jinping neutrino experiment

Baobiao Yue, Jiajun Liao, Jiajie Ling

摘要:

中微子磁矩($ν$ MM)是大质量中微子的重要性质。Xenon 1 T合作组最近观测到的几keV电子反冲的异常过剩可能表明太阳中微子中存在$\sim 2.2\times10^{-11} μ_B$有效中微子磁矩($μ_ν^{eff}$)。因此,必须在不同的实验中进行$ν$ MM检索,以确认或排除此类假设。利用天然中微子源和人工中微子源的电子反冲数据,研究了在锦屏中微子实验上进行4kton有效质量的$ν$ MM测量的可行性。$μ_ν^{eff}$在90% C. L时的敏感性可达$1.2\times10^{-11}μ_B$。太阳中微子的10年数据。除了液体闪烁体中固有的低能背景$^{14}$ C外,我们发现对$ν$ MM的灵敏度与$pp$和$^{85}$ Kr的系统不确定度高度相关。降低系统不确定性($pp$和$^{85}$ Kr)和本征背景($^{14}$ C和$^{85}$ Kr)有助于提高低于这些水平的灵敏度,并达到天体物理学感兴趣的区域。在锦屏中微子探测器上安装了一个3兆居里(MCi)的人工中微子源$^{51}$ Cr,经过55天的实验,它能使$1.1\times10^{-11} μ_B$达到90% C. L.的电子中微子磁矩($μ_{ν_e}$)灵敏度。结合这两种测量,还可以在锦屏探测中微子磁矩的味结构。

英文摘要:

Neutrino magnetic moment ($ν$MM) is an important property of massive neutrinos. The recent anomalous excess at few keV electronic recoils observed by the Xenon1T collaboration might indicate a $\sim 2.2\times10^{-11} μ_B$ effective neutrino magnetic moment ($μ_ν^{eff}$) from solar neutrinos. Therefore, it is essential to carry out the $ν$MM searches at a different experiment to confirm or exclude such hypothesis. We study the feasibility of doing $ν$MM measurement with 4 kton active mass at Jinping neutrino experiment using electron recoil data from both natural and artificial neutrino sources. The sensitivity of $μ_ν^{eff}$ can reach $1.2\times10^{-11}μ_B$ at 90\% C.L. with 10-year data taking of solar neutrinos. Besides the intrinsic low energy background $^{14}$C in the liquid scintillator, we find the sensitivity to $ν$MM is highly correlated with the systematic uncertainties of $pp$ and $^{85}$Kr. Reducing systematic uncertainties ($pp$ and $^{85}$Kr) and the intrinsic background ($^{14}$C and $^{85}$Kr) can help to improve sensitivities below these levels and reach the region of astrophysical interest. With a 3 mega-Curie (MCi) artificial neutrino source $^{51}$Cr installed at Jinping neutrino detector for 55 days, it could give us a sensitivity to the electron neutrino magnetic moment ($μ_{ν_e}$) with $1.1\times10^{-11} μ_B$ at 90\% C.L.. With the combination of those two measurements, the flavor structure of the neutrino magnetic moment can be also probed at Jinping.

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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