Phase transformations in barium, cerium and neodymium isotopes

A method of the definition of the phase transition in experimental dependences is proposed. On the basis of this method the analysis of the energies of the excited states 21+ and 41+ depending on the number of the neutrons is carried out for the barium, cerium and neodymium isotopes. It is shown that these dependences are functions of many figures and consequently they can be regarded as the phase transitions. The meanings of the critical parameters nc = 81 - 82 and critical index α = 0.5 - 0.6 are found and their dependences from the charge of nucleus and of the spin of states are investigated. 6 refs., 5 figs., 1 tab