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  • Exploring the Nature of Matter
    Thomas Jefferson National Accelerator Facility (Jefferson Lab) is a U.S. Department of Energy Office of Science national laboratory. Scientists worldwide utilize the lab’s unique particle accelerator, known as the Continuous Electron Beam Accelerator Facility (CEBAF), to probe the most basic building blocks of matter - helping us to better understand these particles and the forces that bind them - and ultimately our world.

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  • Please use the sections below to find the correct department to address your concerns.

  • The labs annual plan helps guide the lab and it's management as a world-leading research institution for exploring the nature of matter in depth, providing unprecedented insight into the details of the particles and forces that build our visible universe inside the nucleus of the atom.

  • Rolf Ent came to Jefferson Lab in 1993 as a Hall C scientist and adjunct professor at Hampton University. Rolf served as experimental group leader of the Nuclear and High-Energy Physics (NuHEP) Center at Hampton University from 1996-2001, and served as Hall C Leader from 2002-2006. He then served as the 12 GeV Upgrade Science lead at Jefferson Lab until 2009, and became associate director for experimental nuclear physics in 2011. He served on the Nuclear Science Advisory Committee from 2006-2008.  Rolf received his Ph.D. from the Free University of Amsterdam in 1989.

  • As Legal Counsel for the Thomas Jefferson National Accelerator Facility, Rhonda provides all legal advice needed for Jefferson Lab to manage legal exposure and risks. She regularly briefs the Director on potential liabilities and items that affect the Lab.

    Scales joined Jefferson Lab in June 1994 as a staff attorney. She was promoted to Assistant General Counsel for Jefferson Lab and SURA in 1996. In 2001 she was appointed Legal Counsel.

  • The Lab is pursuing three major research topics.

    Structure of the Nucleus

    In this simple view of a nucleus, quarks (red, blue and green) inside three nucleons are interacting by exchanging particles. Larger version.

  • Quarks are difficult to study, because the force that binds quarks together (through the exchange of gluons) is so strong that we observe them only when they are combined into larger, composite particles, such as protons and neutrons. So if we wanted to measure the size of these smallest building blocks of matter, how would we do it?

  • The lab gives scientists a unique and unprecedented probe to study quarks, the particles that make up protons and neutrons in the atom's nucleus. The accelerator delivers a continuous beam to a target, like hydrogen, carbon, gold or lead. When the beam collides with its target, particles scatter. By studying the speed, direction and energy of the scattered particles scientists will learn more about how the nucleus is put together.