April 18, 2019

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Spin Flipper Upends Protons

The spin direction of protons was reversed, for the first time, using a nine-magnet device, potentially helping tease out details about protons.

April 18, 2019

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Sea Quark Spin Surprise!

Since the 1980s, scientists have known that quark and antiquark spins within a proton account for, at best, a quarter of the overall proton spin.

April 17, 2019

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The Weak Side of the Proton

A precision measurement of the proton’s weak charge narrows the search for new physics.

April 15, 2019

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Fast-Moving Pairs May Solve 35-Year-Old Mystery

A re-analysis of data suggests that proton-neutron pairs in a nucleus may explain why their quarks have lower average momenta than predicted.