In its March/April issue, CoVaBIZ magazine has named Jefferson Lab Director Kimberly Sawyer as one of its 150 most influential people in coastal Virginia.
Two experiment collaborations, the g2p and EG4 collaborations, combined their complementary data on the proton鈥檚 inner structure to improve calculations of a phenomenon in atomic physics known as the hyperfine splitting of hydrogen. An atom of hydrogen is made up of an electron orbiting a proton. The overall energy level of hydrogen depends on the spin orientation of the proton and electron. If one is up and one is down, the atom will be in its lowest energy state. But if the spins of these particles are the same, the energy level of the atom will increase by a small, or hyperfine, amount. These spin-born differences in the energy level of an atom are known as hyperfine splitting.
Data scientists and developers at Jefferson Lab are exploring some of the latest artificial intelligence techniques to help make high-performance computers more reliable and less costly to run. The study deploys machine learning models that are trained to monitor and predict the behavior of a scientific computing cluster.
An early-career physicist mathematically connects timelike and spacelike form factors, opening the door to further insights into the inner workings of the strong force. A new lattice QCD calculation connects two seemingly disparate reactions involving the pion, the lightest particle governed by the strong interaction. One reaction is known as the spacelike process, where an electron is bounced off a pion.
Jefferson Lab鈥檚 heating, ventilation and air conditioning professionals ensure optimal operation of operational and scientific facilities through their technical expertise.
Researchers have been working for decades to understand the details of where the proton gets its intrinsic angular momentum, otherwise referred to as its spin. Recently, there have been indications that the spin contribution of the gluons could either be positive or negative. Now, a new approach that avoids assumptions and re-analyzes observational data with lattice quantum chromodynamics points strongly toward a positive gluon spin contribution, 鈭唃, to the proton spin.
Physicists know from previous experiments that what happens at the nuclear scale to protons and neutrons also affects their constituent quarks and gluons. A novel new framework has tapped on short-range correlations 鈥� brief pairings of protons and neutrons - to decipher the particles鈥� choreography and reveal this connection.
The year 2025 has been proclaimed the International Year of Quantum Science and Technology by the United Nations, recognizing 100 years since the initial development of quantum mechanics.
For nearly half a century, Robert D. 鈥淏ob鈥� McKeown has probed nuclear particles and educated rising generations of physicists. Now, the former deputy director for science at the U.S. Department of Energy鈥檚 Thomas Jefferson National Accelerator Facility is being honored for his outstanding career contributions with the 2024 American Physical Society鈥檚 Division of Nuclear Physics (DNP) Distinguished Service Award.
Jefferson Lab announces its newest slate of projects to receive Laboratory Directed Research & Development (LDRD) program funding for 2025. In its 12th year, the LDRD program will split $3 million among 13 different projects.
Jefferson Lab has dedicated the first particle accelerator cryomodule built with niobium-tin components. The quarter cryomodule is the first designed and tested for accelerating an electron beam to 10 MeV or greater energies and marks a major milestone toward the next era of SRF particle accelerators.
Jian-ping Chen, Jefferson Lab Hall A and C Staff Scientist and SoLID Project Manager, and his team created a 3D-printed model of the Solenoidal Large Intensity Device (SoLID) project. Here鈥檚 why.
Mark Kevin Jones is a true Renaissance man in nuclear physics. Throughout his career, he has garnered many accomplishments, and he鈥檚 even worn quite a few hats in his three decades at Jefferson Lab. Now, Jones has been recognized for his work by his peers by being named a Fellow of the American Physical Society 鈥淔or scientific leadership in experimental studies of the fundamental nucleon electromagnetic form factors, including the surprising discovery of significant variation in the large momentum behavior of the proton electric form factor, and for developing new detection systems enabling the studies.鈥�
New 2024 APS Fellow Alex Bogacz has spent his career in accelerator physics solving problems. From studying complex particle beam dynamics in particle accelerators to designing next-generation machines, his almost four decades of work have recently been recognized by his peers by being named a Fellow of the American Physical Society in October 2024.
Particle accelerator scientists have made the measurements, crunched the numbers and consolidated the data on the performance of the brightest electron accelerator for nuclear physics research. In a new study, more than 100 authors have detailed the original and current operating parameters, main systems and subsystems, and capabilities and limits of Jefferson Lab鈥檚 main particle accelerator, the Continuous Electron Beam Accelerator Facility (CEBAF).
Walt Akers, Jefferson Lab鈥檚 chief systems engineer for experimental nuclear physics, created a 3D-printed model of a section of the Electron-Ion Collider (EIC) on a short timeline ahead of the lab鈥檚 2024 Open House. He calls it the 鈥淟ego model.鈥�
The latest addition to the computational arsenal of Jefferson Lab is an extraordinary machine with the admittedly ordinary name of 鈥�24s.鈥� The 24s cluster at Jefferson Lab will work to unlock the mysteries of the nucleus of the atom. It was funded by the Nuclear and Particle Physics LQCD Computing Initiative of DOE鈥檚 Office of Nuclear Physics.
Protons and neutrons鈥搆nown collectively as nucleons鈥揳re both the building blocks of matter, but one of these particles has received a bit more attention in certain types of nuclear physics experiments. Until now. New results published in Physical Review Letters describe a first-time direct glimpse of the internal structure of the neutron thanks to the development of a special, 10-years-in-the-making detector installed in Experimental Hall B at Jefferson Lab.
So-called 鈥淴YZ states鈥� defy the standard picture of particle behavior and have given rise to several attempts to understand their nature.
New 2024 American Physical Society Fellow Jozef Dudek is pursuing theoretical descriptions of exotic hadrons, a yet-untallied group of short-lived subatomic cousins of the proton and neutron, those more familiar atomic building blocks.
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