Physics – Nuclear Physics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994nuphs..35..235m&link_type=abstract
Nuclear Physics B Proceedings Supplements, Volume 35, p. 235-239.
Physics
Nuclear Physics
1
Scientific paper
The first 6 months of running with the full length of the lower structure of MACRO with both scintillator and streamer tubes operational has been completed. Combined with 2.5 years of running with 1/6 of the lower detector, roughly 5 million muon events have been analyzed looking for upward going muons by using time information in the scintillator counters. The symmetry of the detector hardware and analysis are exploited to check the acceptance and efficiency for upgoing muon events by studying all downgoing muon events in the data runs used for this analysis. The total number of upgoing muons observed in these running periods was 68 +/- 8stat +/- 7sys which compares to an expected number of events of 81 +/- 12sys. The flux of upgoing muons as a function of zenith angle is shown compared to MC expectation. A search has been made for astrophysical point sources of neutrinos. No point sources of neutrinos have been observed.
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