Abstract
Quadrupole correlations of nucleons having equal energies are considered on the basis of the effective Hamiltonian describing the interaction of nucleon pairs. It is shown that the formation of quadrupole correlations in light nuclei is energetically favoured if the interaction among pairs is attractive. Certain laws in the binding energy of the last neutron in light nuclei are explained by taking into account pair and quadrupole correlations. A criterion obtained shows at what excess of the number of neutrons over that of protons in stable nuclei, as a result of the parting of the Fermi surfaces, some outer neutrons cease to participate in quadruple correlations, which leads to the disappearance of explicit α-particle properties of nuclei.
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