Evidence for time and directional enhancements of multimuon cosmic-ray events

J. Bartelt, H. Courant, K. Heller, T. Joyce, M. L. Marshak, E. A. Peterson, K. Ruddick, M. Shupe, D. S. Ayres, J. Dawson, T. Fields, E. N. May, L. E. Price, K. Sivaprasad

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


We have observed 1.05×106 single-muon and 6869 multimuon events deep underground with the Soudan 1 nucleon-decay detector. The single-muon flux is consistent with isotropy and with results of previous experiments. We have found indications of bursts of multimuon events, particularly from a direction near Cygnus X-3. These bursts arrive from an extended angular region of 30°×30°. The size of the angular region and the lack of a corresponding effect in the single-muon events are difficult to understand. In addition, there is weaker evidence for an excess in the time-integrated multimuon flux near the north galactic pole. We have evaluated the possibility that these effects are caused by random or systematic errors.

Original languageEnglish (US)
Pages (from-to)1630-1641
Number of pages12
JournalPhysical Review D
Issue number7
StatePublished - 1985


Dive into the research topics of 'Evidence for time and directional enhancements of multimuon cosmic-ray events'. Together they form a unique fingerprint.

Cite this