Hall B


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Hall B is the site of the CEBAF Large Acceptance Spectrometer (CLAS) detector. The detector was built and is run by a collaboration of nearly 150 physicists from more than 30 universities in the U.S., Europe, the former Soviet Union and Korea. It took about ten years and $30 million to build, and it has been taking data since December, 1997.

Powerful magnets steer the electron beam into a target in the experimental hall. The beam's individual electrons smash into the protons and neutrons inside the nuclei of atoms in the target. These violent collisions produce new particles; heavier versions of the familiar protons and neutrons as well a whole variety of intermediate mass particles called "mesons". The outgoing electron which collided with the target nucleus as well as the produced particles go flying out into our detector, where they're measured. Our job as particle physicists is to use these measurements to try to deduce the underlying structure of protons and neutrons in the target and to try to understand the forces that create these particles.

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