The sphere stacking of U-234 has a photograph of the
model of a nucleus.
http://ferronuclear.blogspot.com/p/uranium.html
Also, a silhouette of the Uranium nucleus is shown next
to the other elements. A future element with
atomic weight 305 is also depicted in profile
in Figure 2.
Fission can be explained by the shapes of nuclei. Look,
people are saying this theory is absolutely accurate.
I am skeptical about that. But the dilation due to
relativistic effects is modeled as a distorted pyramid shape.
A "dilator" shape is put under the cubic hexapyramids
of heavy elements.