The Multiplicity of Neutrons from the Interaction ofμ−Mesons at Rest in Pb, Bi, Sn, and Al

Abstract

The average multiplicity $〈\nu 〉$ of neutrons emitted from a nucleus which has absorbed a ${\mu }^{-}$ meson has been determined for several materials: $〈\nu 〉=2.14\mathrm{}\pm 0.13$ for Pb, 2.32±0.17 for Bi, 1.54±0.12 for Sn, 0.95±0.17 for Al. From $〈\nu 〉$, by using compound nucleus theory, the average excitation given the nucleus was found to be about 20 Mev for all the nuclei studied.