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Scientists break 30-year-old record in electron beam spin measurement

The team achieved an impressive precision of 0.36 percent in measuring electron beam polarization using Compton polarimetry. Researchers achieve record-breaking electron beam polarization measurement, setting the stage for future Jefferson Lab experiments. ....

Jefferson Lab , Calcium Radius Experiment , Lead Radius Experiment ,

Using heavy-ion collisions at the LHC, scientists determine the thickness of neutron 'skin' in lead-208 nuclei

Using heavy-ion collisions at the LHC, scientists determine the thickness of neutron 'skin' in lead-208 nuclei
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United States , Giuliano Giacalone , Ultrarelativistic Nuclear Collisions , Heidelberg University , Thomas Jefferson National Accelerator Facility , Theoretical Physics Department , Large Hadron Collider , Big Bang , Lead Radius Experiment , Physical Review , Neutron Skin , Physical Review Letters ,

Thick-skinned: Using heavy-ion collisions at the LHC, scientists determine the thickness of neutron "skin" in lead-208 nuclei

Lead-208 has an intriguing nucleus. It is neutron rich, containing 82 protons and 126 neutrons. One of its more interesting properties is its structure: its centre is composed of both protons and neutrons, but at its edge, there is a diffuse shell of mostly neutrons. Scientists call this the neutron “skin.” Research into the neutron skin can help deepen our understanding of quantum chromodynamics, that is, how quarks and gluons (exchange particles of the strong force) in the nucleus behave. This can also have applications in astrophysics, giving insight into the structure of neutron stars – the very dense core left behind after a star between 10 and 25 times the mass of the Sun has undergone a supernova explosion. Using data from heavy-ion runs of the Large Hadron Collider, theoretical physicists at CERN have been able to determine the thickness of the lead-208 neutron skin to be 0.217±0.058 femtometres. This is in line with previous measurements obtained by other collaborations ....

United States , Giuliano Giacalone , Heidelberg University , Thomas Jefferson National Accelerator Facility , Theoretical Physics Department , Large Hadron Collider , Big Bang , Lead Radius Experiment , Arge Hadron Collider , High Energy Physics ,