1985/05/13 by Marvin L. Marshak, J. Bartelt, H. Courant +11 · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Particle physics theoretical and experimental studies #Neutrino Physics Research
paper · doi:10.1103/physrevlett.54.2079
openalex publication_date 1985/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We have observed underground cosmic-ray muons, corresponding to a secondary flux of \ensuremath∼7\ifmmode×\else\texttimes\fi10^\ensuremath-11 cm^\ensuremath-2 s^\ensuremath-1, at a depth of 1800 m water equivalent, which appear to be initiated by Cygnus X-3. This identification is based on both direction and phase coherence. The existence of such secondary muons conflicts with the current understanding of photon cascades and/or the nature and location of Cygnus X-3.