The Fundamental Constants Data Center is focused on physics relevant to the determination of values of the fundamental constants of physics and chemistry.

The Radioactivity Group's mission is to develop, maintain, and disseminate radioactivity standards, develop and apply radioactivity measurement techniques, and engage in research to meet the requirements for new standards.

The Neutron Physics group maintains and supports the nation's premier fundamental neutron physics user facilities. The group has developed the nation's only high-resolution neutron imaging user facility (NIF) for fuel cell research. We maintain, and disseminate measurement standards through both

The Dosimetry Group advances the measurement of quantities important in the radiological sciences through programs in the dosimetry of x-rays, gamma-rays, electrons, and other charged particles.

We use ultracold gases and other atomic systems to study quantum phenomena including many-body physics, superfluidity, and quantum information.

Develops, measures, understands and exploits quantum and electronic devices and sensors at the interface between atomic and nanoscale solid-state systems. Systems under study include dopant-based and nanofabricated Si devices for quantum technologies, quantum simulation, quantum sensing and charge

The mission of the Atomic Spectroscopy Group is to measure, calculate, critically compile, and disseminate reference data on atomic properties and fundamental constants in support of basic research, commercial development, and national priorities.