Abstract
Neutrino magnetic moment (νMM) is an important property of massive neutrinos. The recent anomalous excess at few keV electronic recoils observed by the XENON1T collaboration might indicate a ∼ 2.2 × 10−11μB effective neutrino magnetic moment ( {mu}_{nu}^{mathrm{eff}} ) from solar neutrinos. Therefore, it is essential to carry out the νMM searches at a different experiment to confirm or exclude such a hypothesis. We study the feasibility of doing νMM measurement with 4 kton fiducial mass at Jinping neutrino experiment (Jinping) using electron recoil data from both natural and artificial neutrino sources. The sensitivity of {mu}_{nu}^{mathrm{eff}} can reach < 1.2 × 10−11μB at 90% C.L. with 10-year data taking of solar neutrinos. Besides the abundance of the intrinsic low energy background 14C and 85Kr in the liquid scintillator, we find the sensitivity to νMM is highly correlated with the systematic uncertainties of pp and 85Kr. Reducing systematic uncertainties (pp and 85Kr) and the intrinsic background (14C and 85Kr) can help to improve sensitivities below these levels and reach the region of astrophysical interest. With a 3 mega-Curie (MCi) artificial neutrino source 51Cr installed at Jinping neutrino detector for 55 days, it could give us a sensitivity to the electron neutrino magnetic moment ( {mu}_{nu_e} ) with < 1.1 × 10−11μB 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.
Highlights
4 Conclusions νMM measurement plays an important role in determining the intrinsic nature of neutrinos and probing new physics in the neutrino sector
XENON1T recently reports a hint of a ∼ 2.2 × 10−11μB effective neutrino magnetic moment
We have calculated the feasibility of doing νMM measurement at Jinping neutrino experiment with both natural and artificial neutrino sources
Summary
The Jinping neutrino experiment (Jinping) [32], located in one of the deepest underground laboratories with 2400 m vertical rock-overburden, aims to study MeV-scale neutrinos, including solar neutrinos, geoneutrinos and supernova neutrinos with the great benefit of ultralow cosmic-ray muon rate. We assume the detector has 4 kton fiducial target mass out of 5 kton total mass based on [41]. Compared to Borexino, Jinping is expected to be more sensitive because of a much lower cosmic-ray muon rates and much larger detector mass. ΝMM is generally detected through the neutrino-electron elastic scattering (νES). The cross section of νES with νMM can be expressed as dσ dTe (Te, Eν ). In the standard model (SM) cross section term, Te is the kinetic energy of recoil electron, Eν is the neutrino energy, and σ0 satisfies σ0. In νMM cross section term, α is the fine structure constant. The νMM cross section from neutrino magnetic moment is proportional to (1/Te − 1/Eν), which indicates lowing detector energy threshold can significantly boost the detection capacity
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