Abstract
We calculate energies E 2 + and transition strengths B ( E 2 ) ↑ of the lowest 2 + states of even Te, Sn and Ni isotopes in a neutron-rich region, using quasiparticle random phase approximation with simple separable type interactions. With those calculations reproducing the experimental systematics very well, we discuss, first, an unusual relation of E 2 + and B ( E 2 ) ↑ of 132, 136 Te isotopes, which does not follow an empirical formula B ( E 2 ) ↑ ∝ 1 / E 2 + . Second, B ( E 2 ) ↑ of 132 Sn is discussed which is larger than those of the neighboring even Sn. This is a phenomenon confirmed by an experiment very recently. Third, we point out that the small B ( E 2 ) ↑ of 68 Ni is due to fragmentation of the transition strength into some excited states in a low-energy region.
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