This is precisely the difference between the new, smaller, dimension of the proton, the nucleus of the hydrogen atom, and the value which has been assumed so far. Instead of 0.8768 femtometres it ...

Muonic Hydrogen and the Proton Radius Puzzle. Randolf Pohl et al. in Annual Review of Nuclear and Particle Science , Vol. 63, pages 175–204; October 2013. FROM OUR ARCHIVES ...

This formed an exotic, heavier version of the hydrogen atom. And here, measuring the proton's radius produced an entirely different value—something that shouldn't have happened.

Proton size puzzle: Surprisingly small proton radius confirmed with laser spectroscopy of exotic hydrogen Date: January 24, 2013 Source: Paul Scherrer Institut (PSI) ...

An atom of hydrogen is made up of an electron orbiting a proton. ... (PSI) in Switzerland measured the radius of a proton in muonic hydrogen and found it was smaller than previously thought.

The proton, discovered 100 years ago 1, is an essential building block of visible matter. The nucleus of a hydrogen atom consists of a single proton, making this atom a suitable platform for ...

They used the spectroscopic method but with special “muonic” hydrogen: instead of an electron, this atom contains a muon, a particle with about 200 times the mass of an electron.

Previous teams had inferred the proton’s radius, which is impossible to measure directly, by studying how electrons and protons interact. One method uses the simplest atom, hydrogen, which ...

The bond length of the hydrogen molecule is the diagonal of a square on the Bohr radius and hence also has two Golden sections, which form the cationic and anionic radii of hydrogen.

Tauonium, composed of a tauon and its antiparticle, has a Bohr radius of only 30.4 femtometers (1 femtometer = 10-15 meters), approximately 1/1,741 of the Bohr radius of a hydrogen atom.

If you convert the entirety of a hydrogen atom into energy, you get 1.5 x 10-10 Joules, That looks like a very small number, and it is; but gamma radiation is usually bad for you, right?