Bohr Hamiltonian, mass coefficients, and the structure of well deformed axially symmetric nuclei

It is shown that in the Bohr Hamiltonian the use of three different mass coefficients for the two vibrational and the rotational modes is very important for the correct description of the properties of the well deformed axially symmetric nuclei. Four parameters per nucleus are needed to describe the relative values of energies and $B(E2)$'s.

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