Asymmetry of Neutrons from Muon Caputre in Silicon, Sulfur, and Calcium

Abstract

We have measured the asymmetry in the angular distribution of neutrons emitted following the capture of negative muons in silicon, sulfur, and calcium. The asymmetries, normalized to 100% muon polarization, varied from near zero for low neutron energies to +0.32±0.05, +0.30±0.08, and +0.20±0.08 for energies greater than 15.6 MeV for silicon, sulfur, and calcium, respectively, in disagreement with the results of most other recent experiments.