This particles studied by astroparticle physics are the only ones in the nuclei of hyrdogen atoms
.... (The Standard 
Model of particle physics had assumed that neutrinos are massless and ... A 
hydrogen nucleus is a single proton, so simultaneous nuclear interactions, which 
would... [DOC] [TLE] Nuclear physics - Wikipedia [PAR] Nuclear physics is the field of physics that studies atomic nuclei and their 
constituents and ...