Abstract:  *Ryan Connolly (Physics & Astronomy Dept, MSU) - Signatures of exotic matter in the deep neutron star crust *Bill Lynch (NSCL, MSU) - Crust-core transition in neutron stars

Abstract:  An overview is given on our recent extreme precision mass measurements on single cooled ions stored in Penning traps. Mass measurements provide crucial information for atomic, nuclear and neutrino physics as well as for testing fundamental symmetries. For example, the most stringent test of CPT symmetry in the baryonic sector has been performed by mass comparison of the antiproton with H-. Furthermore, we improved the knowledge of the electron atomic mass by a factor of 13. Together with our newly determined proton mass, this most precise electron-to-proton mass ratio influences the Rydberg constant.