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But the lower energies used by PRad circumvent the problem.

To further improve precision, PRad injected its hydrogen molecules directly into the vacuum pipe that carries the electron beam, rather than keeping it in a metal container as many previous experiments had done.

But Jan Bernauer, a physicist at the Massachusetts Institute of Technology in Cambridge who has led earlier scattering measurements that found a larger proton, is not entirely convinced by PRad’s results.

PRad shoots a beam of electrons at hydrogen molecules, and measures how some of the electrons are deflected.

Ashot Gasparian, a particle and nuclear physicist at North Carolina A&T State University in Greensboro who is the spokesperson for PRad, thinks he can still upgrade his experiment to further improve its precision.