Mathematics – Probability
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvd..44..661m&link_type=abstract
Physical Review D (Particles and Fields), Volume 44, Issue 3, 1 August 1991, pp.661-667
Mathematics
Probability
1
Scientific paper
A high-multiplicity event detected by the Kolar Gold Field (KGF) detector is examined to determine whether or not it is an abnormal phenomenon, taking into account the cosmic-ray primary composition and ordinary interaction models. Our calculation shows that a proton-dominated primary composition around the ``knee'' is not consistent with measurements of the multiple-muon distributions. On the other hand, taking 15-40 % for the proton fraction and 25-50 % for iron nuclei, there is satisfactory agreement. We have estimated the frequency of multiple-muon events with muons in excess of 20 taking the above primary composition. From this result, one would expect such an event per 60-100 years of operation time, and therefore the probability of observing such an event becomes a few percent for the duration of KGF experiment. Thus, we would suppose that the KGF event is a natural phenomenon in spite of their argument that it is difficult to explain it in terms of a conventional muon production mechanism even if an extreme case of heavy chemical composition of primaries is assumed.
Komori Hiroyuki
Minorikawa Y.
Mitsui Kenji
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