Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.
Phys Rev Lett. 2010 Aug 6;105(6):061801. doi: 10.1103/PhysRevLett.105.061801. Epub 2010 Aug 2.
A new detection channel on atomic ionization for possible neutrino electromagnetic interactions is identified and studied. Significant sensitivity enhancement is demonstrated when the energy transfer to the target is of the atomic-transition scale. The interaction cross section induced by neutrino magnetic moments (μ(ν)) is evaluated with the equivalent photon method. A new limit of μ(ν)(νover ¯)<1.3×10(-11) μ(B) at 90% confidence level is derived by using current reactor neutrino data. Potential reaches for future experiments are explored. Experiments with sub-keV sensitivities can probe μ(ν) to 10(-13) μ(B). Positive observations of μ(ν) in this range would imply that neutrinos are Majorana particles.
为可能的中微子电磁相互作用鉴定并研究了原子电离的新探测通道。当能量转移到靶标时处于原子跃迁尺度，展示了显著的灵敏度增强。利用等效光子方法评估了由中微子磁矩（μ（ν））引起的相互作用截面。利用当前的反应堆中微子数据，在 90%置信水平下得出了新的限制μ（ν）（ν[over ¯]（e））<1.3×10(-11) μ(B)。探讨了未来实验的潜在范围。具有亚千电子伏特灵敏度的实验可以探测到 10(-13) μ(B)的 μ(ν)。在此范围内μ(ν)的观测结果将表明中微子是马约拉纳粒子。
