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In certain neutron-rich Te isotopes, a decrease in the energy of the firstexcited 2+ state is accompanied by a decrease in the E2 strength to that statefrom the ground state, contradicting simple systematics and general intuitionabout quadrupole collectivity. We use a separable quadrupole-plus-pairingHamiltonian and the quasiparticle random phase approximation to calculateenergies, B(E2,0+ -> 2+) strengths, and g factors for the lowest 2+ states near132Sn (Z >= 50). We trace the anomalous behavior in the Te isotopes to areduced neutron pairing above the N = 82 magic gap.Comment: 1 figure added. to be published in Phys. Rev.

physical review. c. nuclear physics/physical review. c, nuclear physics

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Anomalous behavior of2+excitations around132Sn