Nuclear Fission Yield

Neutron induced nuclear fission splits 235U or 239Pu into large pieces unsymmetrically. Masses of these fission products range from 60 to 160.

Note that this plot uses a log scale for the percent of the produced nuclides on the vertical axis, but the horizontal axis is linear.

Two peaks occur at masses about 95 and 140. There are plenty of nuuclides with these masses among the fission products. This curve is the superposition of two curves.