Public Release: 16-Oct-2014
Protons hog the momentum in neutron-rich nuclei
Protons and neutrons that have briefly paired up in the nucleus have higher-average momentum, leaving less for non-paired nucleons. Researchers have now shown for the first time that this phenomenon exists in nuclei heavier than carbon, including aluminum, iron and lead and also surprisingly allows a greater fraction of protons than neutrons to have high momentum in these neutron-rich nuclei, contrary to long-accepted theories and with implications for ultra-cold atomic gas systems and neutron stars.
DOE/Office of Science, National Science Foundation, Israel Science Foundation, Comision Nacional de Investigacion Cientifica y Technologica, Centre National de la Recherche Scientifique
Public Release: 14-May-2014
CEBAF beam goes over the hump: Highest-energy beam ever delivered at Jefferson Lab
The Continuous Electron Beam Accelerator Facility at Jefferson Lab has achieved the final two accelerator commissioning milestones needed for approval to start experimental operations following its first major upgrade. The machine has delivered its highest-energy beams ever, 10.5 billion electron-volts through the entire accelerator and into its newest experimental area for the first time.
DOE/Office of Science
Public Release: 14-Apr-2014
Beam on target!
Late on April 1, the crown jewel of the Department of Energy's Thomas Jefferson National Accelerator Facility sparkled its way into a new era. Following an upgrade of the Continuous Electron Beam Accelerator Facility, the CEBAF accelerator delivered the highest-energy electron beams it has ever produced into a target in an experimental hall, recording the first data of the 12 GeV era.
US Department of Energy Office of Science
Public Release: 5-Feb-2014
Quarks in the looking glass
A recent experiment carried out at DOE's Jefferson Lab has determined how much of the mirror-symmetry breaking in the electron-quark interaction originates from quarks' spin preference in the weak interaction five times more precisely than a previous measurement. The result has also set new limits, in a way complementary to high-energy colliders such as the Large Hadron Collider at CERN, for the energies that researchers would need to access physics beyond the Standard Model.
Department of Energy Office of Science, National Science Foundation Division of Physics, Jeffress Memorial Trust
Public Release: 9-Dec-2013
Newly invented shielding for stopping neutrons cold
When faced with the challenge of protecting sensitive scientific equipment and computers from radiation, engineers at the US Department of Energy's Thomas Jefferson National Accelerator Facility decided to take matters into their own hands. They came up with three innovative products that could soon find their way to nuclear power plants, particle accelerators and other radiation-generating devices around the world.