Systematics of the Alpha-Decay to Vibrational 2+ States

We have done a systematic analysis of α-decays to excited 2+ states. Collective excitations were considered within the Quasiparticle Random-Phase Approximation. As a residual two-body force we used the surface-delta interaction. The only free parameter is the ratio of the isovector and isoscalar strengths. This approach is able to explain the general features of electromagnetic and α-transitions along isotope chains. We conclude that the α-decay to excited 2⁺-state is induced mainly by the effective residual interaction between proton and neutron systems. We also predicted α-decay hindrance factors of 2⁺-states with respect to the ground state and B(E2) values for even-even nuclei.

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