Abstract
Nuclear emulsions have been exposed at a depth of 58 m.w.e. underground to study stopped mesons, the rates for muons and pions being (73±3)10-3 and (2.7 ± 0.6)10-3 cm-3 day-1 respectively. The positive-negative ratio for the numbers of stopped muons is 1.1 ± 0.2, and the negative-positive ratio for stopped pions is 2.3 ± 0.9. The data on the stopped muons are consistent with the momentum spectrum of the cosmic ray muons at sea level. The pion data are not inconsistent with a mechanism of muon-nucleus interaction through the Coulomb field, but imply that pions are also produced by neutron secondaries from muon interactions.
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