See references in

In 1996 we found the formula of the particle radii[1-3] 1/31.55 [ ()]r m Gev = jn, (1) where 1 jn 1510− = cm and m (Gev) is the mass of the particles. From (1) we have that the proton and neutron radii are 1.5 jn. Pohl et al measure the proton diameter 3 jn[4]. We have the formula of the nuclear radii 1/31.2 ()r A = fm, (2) where 1 fm 1310− = cm and A is its mass number. It is shows that (1) and (2) have the same form. The particle radii 5r < jn and the nuclear radii 7r < fm