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Neutron Lifetime Discrepancy

Pyrian

Outlander
Messages
4
FOR SCIENCE! 8)

So, free neutrons decay into a proton and electron (and an anti-neutrino and sometimes a gamma ray). Physicists have tried to measure the half-life of this decay, and they've run into a problem: If you measure the protons generated ("beam" technique), you get one answer, and if you measure the neutrons disappearing ("bottle" technique) you get a different answer. Attempts to bring down the error term have been pretty successful, except they only confirm that the discrepancy seems to be real.

The obvious possibility is that a rather substantial number of neutrons are decaying without producing a proton. And that's very interesting, if it's true. But nobody's got a good answer that's both detectable and detected.

https://www.scientificamerican.com/article/neutron-lifetime-mystery-new-physics/
https://www.quantamagazine.org/neutron-lifetime-puzzle-deepens-but-no-dark-matter-seen-20180213/
https://www.sciencenews.org/blog/science-ticker/new-measurement-neutron-lifetime-still-puzzling
 

Arnox

Master
Staff member
Founder
Messages
5,317
There's only two answers here that I can see.

Either the missing protons are (somehow) teleporting away, or the missing protons are actually becoming a different form of matter we're not detecting.
 

Signa

Libertarian Contrarian
Sanctuary legend
Messages
765
Teleporting is quite likely, given the nature of sub-atomic particles, but I don't know enough about either method for measurements to have a better suggestion or how they may have already checked for it.
 
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