Mystery of the Shrunken Proton 171
ananyo writes "The proton, a fundamental constituent of the atomic nucleus, seems to be smaller than was previously thought. And despite three years of careful analysis and reanalysis of numerous experiments, nobody can figure out why. An new experiment published in Science only deepens the mystery. The proton's problems started in 2010, when research using hydrogen made with muons seemed to show that the particle was 4% smaller than originally thought. The measurement, published in Nature, differed from those obtained by two other methods by 4%, or 0.03 femtometers. That's a tiny amount but is still significantly larger than the error bars on either of the other measurements. The latest experiment also used muonic hydrogen, but probed a different set of energy levels in the atom. It yielded the same result as the Nature paper — a proton radius of 0.84 fm — but is still in disagreement with the earlier two measurements. So what's the problem? There could be a problem with the models used to estimate the proton size from the measurements, but so far, none has been identified. The unlikely but tantalizing alternative is that this is a hint of new physics."
Dr. George Costanza theorizes (Score:4, Funny)
Subway's explanation now makes sense (Score:4, Funny)
Re:easy (Score:1, Funny)
So you're saying size *does* matter? (Score:5, Funny)
Now, they tell me.
Re:Usual suspect (Score:5, Funny)
1 Gallon is 8 pints in both systems.
US pt. = 0.47375 L
IM pt. = 0.56875 L
The difference between the two gallons is 0.76 L which is 1 2/3 of a US pint or 1 1/3 of an imperial pint.
So the difference is actually just 1/3 of a pint, that is 0.16L (1/3 US pt.) or 0.19L (1/3 IM pt.) So the difference (0.19L - 0.16L) in Litres is ACTUALLY only 0.03L.
And since 0.03 litre is only about 1 Fl.Oz and a Fl.Oz is 1/160 imperial Gallon as anyone knows, and 1/128 US Gallon for that matter the difference all the sudden is only 1/32 Fl.Oz which in turn is hardly a teaspoon full...
erhm...
Hmmm... maybe I made a boo-boo somewhere along the road...
Maybe things would be much more clear if