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Particle first confirmed in 1955 at Berkeley WSJ Crossword Clue

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Frequently Asked Questions About This Clue

The most common and recent 10-letter answer for "Particle first confirmed in 1955 at Berkeley" is ANTIPROTON.
The clue refers to a subatomic particle discovered at the University of California, Berkeley in 1955. An 'antiproton' is the antimatter counterpart of the proton, which was first detected in experiments conducted by physicists Emilio Segrè and Owen Chamberlain, leading to a Nobel Prize.
This clue was last seen in the WSJ Crossword on September 11, 2026.
An antiproton is the antiparticle of a proton, having the same mass but opposite charge.

The clue “Particle first confirmed in 1955 at Berkeley” is a classic crossword staple, frequently appearing in puzzles like the WSJ crossword. For the puzzle dated September 11 2026, the definitive 10-letter answer is: ANTIPROTON.

Expert Tip: When you’re stuck, try to analyze the structure of the clue itself. Is it a direct definition, a pun, a fill-in-the-blank, or a pop culture reference? Identifying the type of clue you’re dealing with is a key skill for improving your solving speed.

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