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Answer for the clue "Physicist's proposed particle ", 5 letters:
axion

Alternative clues for the word axion

Word definitions for axion in dictionaries

Wikipedia Word definitions in Wikipedia
An Axion is a hypothetical elementary particle. Axion may also refer to: a son of Priam of Troy, killed by Eurypylus a son of Phegeus and brother of Temenus, murdered Alcmaeon Axion laundry detergent , an "enzyme-active" detergent made by Colgate Palmolive ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1978, from axial + scientific suffix -on .

Wiktionary Word definitions in Wiktionary
n. (context physics English) a hypothetical subatomic particle postulated to explain some symmetry problems arising in the strong nuclear force.

Usage examples of axion.

Then, when you go on to axion feeds you will have a working knowledge of the steps involved.

After they capture you they will use the axion feed to uncover my part in this.

I stopped to think about this, then remembered what they could do with the axion feed and I started up again.

And there'll be new technology for new and better observational instruments, detectors for dark matter concentrations, axions, gravity waves, and neutrinos, for instance, that will need to be built, using the new engineering techniques.

Do you remember that back in 1983 Paul Sikivie at the University of Florida suggested that if axions existed, they could be converted to photons by a big magnetic field?

The axions, which are more or less at rest in the cosmic background reference frame, are moving through my apparatus at about 1/800 of the speed of light.

So although we can't directly detect either the axions or the particles they're converted into, whatever those are, we can detect the momentum change of the conversion process.

In this case, the exhaust velocity is lightspeed, but the input velocity depends on how fast the object is moving through the axion medium.

Perhaps in the Makers' Universe in the vicinity of their solar system the axion density was too low to show Garcia's effect.

They're the cold dark matter school, axions and photinos and gravitinos, and they don't give the right lumpiness to the Universe, either.

The search for exotic particles such as "hot" neutrinos and "cold" photinos and axions will tell us about the far future of the universe.

Candidates included heavy neutrinos, axions, a catch-all termed "weakly interacting massive particles," or "WIMPS," photinos, strings, superstrings, quark nuggets, none of which had been observed, but had emerged from attempts at formulating unified field theories.