Some Regularities in the Nuclear Level Spacings of Hg, Au, and Pt

An attempt is made to determine any systematic behavior of nuclear energy levels in a number of heavy elements, as the number of protons (for a fixed neutron number) or neutrons (for a fixed proton number) is changed. Certain regularities in the movement of levels are pointed out and discussed. The occurrence of "pure" $M1\mathrm{}$ and mixed $M1+E2\mathrm{}$ transitions (in odd-$A$ nuclei) as related to the type of odd particle and the change in orbital angular momentum is summarized. Empirical evidence for $L$ subshell conversion regularities for $M4\mathrm{}$ and $E3\mathrm{}$ multipole orders is given. An extension of this work is suggested.