Argonne ATLAS Fundamental Symmetries Results and Upgrades

Nuclei are complex objects whose properties are shaped by strong, weak and electromagnetic interactions. It is predicted that roughly 7000 different combinations of protons and neutrons can form a nucleus and out of those, only 288 are observed to be stable (or practically stable). Because the nucleus is sensitive to all interactions, it can be used as a laboratory to study them or search for effects of additional non-Standard-Model interactions. These studies take advantage of certain properties or decays of nuclei that enhance or isolate a specific interaction or effect. In many cases, an unstable nucleus will have the most favorable properties to study a specific effect and the advantage is sufficient to warrant the extra difficulties associated with precision measurements on short-lived nuclei. Powerful techniques have been developed to produce and prepare these short-lived nuclei, either in an atomic, ionic or molecular form, to take advantage of their properties for such studies. These approaches and recent results obtained at Argonne to look for physics beyond the Standard Model, or more precisely determine parameters of the Standard Model, will be presented. The complementarity and competitiveness of these approaches will also be discussed.