Jefferson Lab researchers utilize CLAS and CEBAFs 5.7 GeV continuous beam to gather new insights on several fundamental questions about the neutron
The CEBAF Large Acceptance Spectrometer (CLAS) is like a perfect survey instrument. Because it surrounds the interaction point in Jefferson Labs Hall B, it can record several particles produced in a subatomic interaction at once. More than 40,000 data channels convey information on the trajectory (measured with drift chambers), speed (time-of-flight counters) and energy (electromagnetic calorimeters) for all detected particles, up to 3,000 times a second. Often, multiple experiments run at the same time in Hall B, and data for all of them are collected simultaneously.
During the recent (February through mid-March) run dubbed "E6," researchers used CLAS together with CEBAFs 5.7 GeV continuous electron beam to gather new insights on several fundamental questions about the neutron. The neutron is one of the two building blocks (together with the proton) of every nucleus, and its properties are just as interesting and important as those of the proton. Unfortunately, these properties are usually obscured because neutrons are generally bound inside nuclei. E6 collaborators from several universities and Jefferson Lab, working on the experiment "Electron Scattering from a High-Momentum Nucleon in Deuterium" are seeking a clearer view of this elusive neutral partner of the proton. This experiment was proposed by co-spokespersons Keith Griffioen, College of William and Mary; and Sebastian Kuhn, Old Dominion University.
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