1. Scintillation Materials Research CenterUniversity of Tennessee Knoxville TN 37996 USA
2. Department of Materials Science and EngineeringUniversity of Tennessee Knoxville TN 37996 USA
3. Physical Science DepartmentIBM Thomas J. Watson Research Center NY 10598 USA
4. Quantum Condensed Matter DivisionOak Ridge National Laboratory Oak Ridge TN 37831 USA