Figure (IMAGE) Osaka University Caption When a negative muon (μ-) is implanted into MgH2, the μ- is trapped by the muon atomic orbitals near a Mg nucleus. Since μ- has a polarized spin, we can obtain information about the magnetic field at the Mg nucleus sites, formed by the hydrogen nucleuses, through the observation of how the μ- spin depolarizes with time. Credit J. Sugiyama/Toyota Central Research & Development Laboratories Inc. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.