Observation of a shadow of the Moon in the underground muon flux in the Soudan 2 detector
Observation of a shadow of the Moon in the underground muon flux in the Soudan 2 detector
A shadow of the Moon, with a statistical significance of $5\ensuremath{\sigma},$ has been observed in the underground muon flux at a depth of 2090 mwe using the Soudan 2 detector. The angular resolution of the detector is well described by a Gaussian with a sigma $<~0.3\ifmmode^\circ\else\textdegree\fi{}.$ The position of the …