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Probing the Skin of a Lead Nucleus April 27, 2021• Physics 14, 58 Researchers make the most precise measurement yet of the neutron distribution in a heavy nucleus, with implications for the structure of neutron stars. Figure 1: A cartoon image of a lead-208 nucleus, showing the mixed proton-neutron core and the neutron “skin” (left). Measuring the thickness of the neutron skin offers clues about how neutron stars are structured (right).× Popular cartoon visualizations depict the protons and neutrons in a nucleus as colored marbles packed randomly into a sphere. In reality, heavy nuclei in which neutrons tend to outnumber protons are more differentiated, with the neutrons nudged radially outward. At the outer limits of such nuclei, the neutrons form a thin “skin” enclosing a core of mixed neutrons and protons (Fig. 1). Now, the Lead Radius Experiment (PREX) Collaboration at the Thomas Jefferson National Accelerator Facility in Virginia has determined the thickne

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