Change in the Nuclear Moment of Inertia at the Number of Neutrons N = 98   and Isotopic Shift of Atomic Levels
  From analysis of experimental data on nuclear rotation, it is found that the so-called rigid-body value of the nuclear moment of inertia and the nuclear-radius values associated with the moment of inertia as functions of the number of nucleons change their behavior at the number of neutrons $N = 98$. This phenomenon is confirmed by experimental data on the isotopic shifts of atomic levels. 
A.M. Kamchatnov, V.G. Nosov