Planning for the next generation of proton-decay experiments in the United States Page: 4 of 16
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rmTT Tfl I7 1- :
m 2000 -
1000 - e
a* 100 -
2 L LLL. L. LI A 111
0 1 2 3 4 5 6 7 8 9101112131415
Number of muon tracks
Figure 1. Muon multiplicity distribution from Soudan 1 for single
muons and for events with two or more parallel tracks.
The scintillation-counter cosmic-ray veto shield has proved to be
quite powerful in rejecting events induced by cosmic-ray interactions
in the rock. Figure 3 shows an example of such an event, which
strongly resembles a nucleon decay except for the hits in six veto
A Monte-Carlo simulation has been used to calculate the Soudan 1
acceptance for slow, ultraheavy, HGT" magnetic monopoles. The
presence of these particles would be apparent in the timing data from
the proportional tubes, which are sensitive for a 7 usec period around
the trigger time. For monopoles which ionize lEke muons, the velocity
range in which Soudan 1 is sensitive is 2 x 10-3 c g < 1.5 x 10-2.
The lack of candidates gives a 90% confidence-level lower limit on the
monopole flux of 2.2 x 10-5/cm2 sr yr. This result is compared below
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Ayres, D.S. Planning for the next generation of proton-decay experiments in the United States, article, January 1, 1982; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1112452/m1/4/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.