The point is to see if they are still muon-neutrinos when they arrive at Super-Kamiokande.
T2K实验的目的是看当它们到达超级神冈探测器的时候，是否仍然是缪子中微子。
2
Going this deep would help reduce the background signals from cosmic ray muon particles.
在这样的深度（实验）将有助于减少宇宙射线中的渺子介子造成的背景信号。
3
However, in muonic hydrogen the Lamb shift is much more dependent on the proton radius because the much heavier muon spends more time very near to – and often within – the proton itself.