A discrepancy in the measured size of the “deuteron” increases the chance that something is amiss in our understanding of atoms. The same group that discovered a curious discrepancy in measurements of ...

Physicists get closer to solving the proton radius puzzle with unique new measurement of the charge radius of the proton Textbook pictures make atomic nuclei seem tidy, but they are actually fuzzy ...

Nonconformists could take a page from the proton’s playbook: The subatomic particle is once again resisting scientists’ attempts to size it up. Everyone agrees the proton is tiny: Its radius is less ...

A new measurement method suggests that the proton, a crucial subatomic particle in the Universe, is smaller than previously believed. All visible matter in the ...

Two protons and a neutron A discrepancy between two different measurements of the charge radius of the helium-3 nucleus may have been reconciled. (Courtesy: Shutterstock) Independent measurements of ...