Observation of the shadowing of cosmic rays by the Moon using a deep underground detector
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields1998Vol. 59(1)
Citations Over TimeTop 11% of 1998 papers
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Abstract
Using data collected by the MACRO experiment during the years 1989--1996, we show evidence for the shadow of the Moon in the underground cosmic ray flux with a significance of 3.6\ensuremath{\sigma}. This detection of the shadowing effect is the first by an underground detector. A maximum-likelihood analysis is used to determine that the angular resolution of the apparatus is $0.9\ifmmode^\circ\else\textdegree\fi{}\ifmmode\pm\else\textpm\fi{}0.3\ifmmode^\circ\else\textdegree\fi{}.$ These results demonstrate MACRO's capabilities as a muon telescope by confirming its absolute pointing ability and quantifying its angular resolution.