Analysis of the shape evolution phenomena in $^{96}$Zr and $^{96}$Mo based on the collective Bohr Hamiltonian

The observed properties of the low-lying collective excitations of $^{96}$Zr and $^{96}$Mo are investigated in the framework of the collective quadrupole nuclear model with the Bohr Hamiltonian, whose potential energy has two minima – spherical and deformed. Satisfactory description of the excitation energies and transition probabilities is obtained. It is shown that in the case of $^{96}$Zr both minima are sufficiently deep. However, in the case of $^{96}$Mo a deformed minimum is only outlined.