THEORETICAL PREDICTION OF EXTREMELY NEUTRON RICH Zr AND Pb

The properties of even–even Zr and Pb isotopes in the ground state are studied up to the neutron drip-lines on the basis of the Hartree–Fock method with Skyrme forces allowing for deformation (DHF). The DHF calculations with Ska forces predict the existence of stability peninsula (or island) around 152Zr. On the example of Zr isotopes it is shown that adding neutrons to an already unstable nucleus with neutron excess can restore the stability. It is demonstrated that extremely neutron-rich Pb isotopes for 222≤A≤230 have abnormally large deformation parameters of proton and neutron density distributions. The existence of 266–288Pb stable against one-neutron emission is also predicted.