Nuclear charge densities

²⁰⁶Pb( z =  82, N = 124) and ²⁰⁵Tl(z  =  81 and N= 124), 2 proton are in 3s_1/2 orbit in ²⁰⁶Pb and 1 proton is in 3s_1/2 orbit in ²⁰⁵Tl.

rho(²⁰⁶Pb) - rho(²⁰⁵Tl)
j0, spherical Bessel function
Compilation of electron scattering data fits to nuclear charge densities