30-Jul-2006 Hypernuclei at Jefferson Lab
In 1827, Robert Brown observed that pollen grains floating in a drop of water jiggled constantly. The phenomenon became known as Brownian motion. Over 75 years later, Einstein proposed that the pollen grains were being jostled by the molecules of water. The impurity (pollen grains) Brown had added to the water allowed Einstein to deduce the presence of individual water molecules and describe at least one of their properties.
28-Jul-2006 Spin identity
Spin is an essential and fascinating phenomenon in the physics of elementary particles. Spin was first defined by Goudsmit and Uhlenbech in 1925, and has played a dramatic role in elementary particle physics, sometimes refuting theories and at other times supporting them. During Experiment E99-117 at Jefferson Lab, an international collaboration collected precision data on the spin of the neutron. Results from this experiment provide evidence that our current understanding of spin is not totally valid.
25-Jul-2006 Using instrumentation built in collaboration with JLab
College of William & Mary (CWM) scientists
have found that an equivalent
dose of potassium iodide five times
higher than the FDA-recommended
dose for humans, in the event of a
nuclear accident, is needed to protect
small animals effectively from radioactive
iodide in medical imaging procedures.
This study was performed as
part of a long-term animal nuclear
imaging project conducted by
of biology, physics and applied
science researchers from CWM and
20-Jul-2006 Pocket-sized physics detector does big science
How do quarks and gluons, the elementary constituents of all matter, combine to form the protons and neutrons in the nucleus of the atom? This is a fundamental unsolved question in nuclear physics that researchers at Jefferson Lab are working to answer. The internal structure of the proton has been studied for several decades, and scientists have learned a great deal. However, much less is known about the structure of the neutron.
20-Jul-2006 Spin structures of protons and neutrons
Just as a top spins on a table, the tiny quarks inside protons and neutrons also
spin. Now a complex calculation
by theoretical nuclear physicists at Jefferson Lab has revealed that a quark's
spin may be altered by the surroundings
of the proton or neutron in which it resides. This surprising result, recently
published in the journal, Physical
Review Letters, may lead to new insights about how ordinary matter is constructed.
20-Jul-2006 On the leading edge
The Accelerator Division's Institute
for Superconducting Radiofrequency
(SRF) Science & Technology
is a world leader in SRF accelerator
technology research and design. Now
the newest idea out of the Institute
may revolutionize the way accelerating
cavities are produced -- making
the manufacturing process faster and
cheaper, while producing cavities that
could potentially outperform any other
niobium cavities ever tested.
20-Jul-2006 Big Bite does its stuff
Jefferson Lab's core mission is to
study the heart of ordinary matter:
the nucleus of the atom. Now Hall A
has a new magnet and detector system
designed to help physicists look
at the nucleus in a whole new light.
"BigBite" has debuted in its first
experiment at Jefferson Lab.
20-Jul-2006 Detector Group builds imaging device for German Research Center
Jefferson Lab Detector Group members traveled to Heidelberg, Germany, to assemble and bring on-line a small-animal imaging device the group developed and built for the German Cancer Research Center. Work on the project began in June 2004. The device is similar other small animal imaging gamma cameras developed by the Detector Group; however, this imager design is based on a new concept developed by Vladimir Popov which resulted in highly improved detector performance.
5-Jul-2006 G-Zero update
In research performed in Hall C,
nuclear physicists have found that
strange quarks do contribute to the
structure of the proton. This result
indicates that, just as previous experiments
have hinted, strange quarks
in the proton's quark-gluon sea contribute
to a proton's properties. The
result comes from work performed by
the G-Zero collaboration, an international
group of 108 physicists from
19 institutions, and was presented at a
Jefferson Lab physics seminar on June
The Department of Energy's Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time.