New theory work at the U.S. Department of Energy’s Thomas Jefferson National Accelerator Facility has shown that more than half of the spin of the proton is the result of the movement of its building blocks: quarks. The result, published in the Sept. 5 issue of Physical Review Letters, agrees with recent experiments and supercomputer calculations. It was thought that the spin of the proton would come from its quarks, but experiments beginning with the European Muon Collaboration in the 1980s. (source: jlab.org)
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