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

In a significant scientific advancement, nuclear physicists at the US Department of Energy’s Thomas Jefferson National Accelerator Facility have broken a three-decade-old record in measuring parallel spin within an electron beam.

An electron beam, akin to a specialized ruler for measuring, operates differently from conventional rulers, as it quantifies spin rather than linear dimensions like inches or millimeters. Researchers claim mastering this “spin measurement” technique is crucial for accurate scientific analyses and understanding particle behavior.

During the CREX experiment, scientists meticulously measured the electron beam’s polarization using Compton polarimetry, achieving an impressive precision of 0.36 percent. This precision exceeds that of SLAC’s SLD experiment, signifying a significant advancement in measurement accuracy. In scientific terms, smaller percentages denote heightened precision, encompassing all systematic uncertainties inherent in the experiment, such as beam energy and laser polarization.

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