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The neutron yield from the capture of cosmic-ray μ^- mesons in silver and lead has been measured by use of a high-efficiency Cd-loaded liquid-scintillator tank. The average multiplicities were determined to be νAg=1.60±0.18 and νPb=1.64±0.16.The multiplicity distributions were also measured and compared with several theoretical models. Although an α-particle model gave results not inconsistent with the data, a Fermi-gas model with the effective nucleon mass M* set equal to M/2 seemed to provide the better fit.
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Kaplan et al. (1958) studied this question.
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