Scientists Measure Calcium Nuclei’s Thin Skin (IMAGE) DOE/US Department of Energy Caption Scientists measured the distribution of protons and neutrons inside calcium-48 nuclei in Jefferson Lab’s Experimental Hall A, shown here. Credit Image courtesy of Thomas Jefferson National Accelerator Facility (Jefferson Lab) Usage Restrictions Image courtesy of Thomas Jefferson National Accelerator Facility (Jefferson Lab) License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.