Anomalous behavior of 2 ¿ excitations around 132 Sn

In certain neutron-rich Te isotopes, a decrease in the energy of the first excited ${2}^{+}$ state is accompanied by a decrease in the $E2$ strength to that state from the ground state, contradicting simple systematics and general intuition about quadrupole collectivity. We use a separable quadrupole-plus-pairing Hamiltonian and the quasiparticle random phase approximation to calculate energies, ${B(E2,0}^{+}\ensuremath{\rightarrow}{2}^{+})$ strengths, and g factors for the lowest ${2}^{+}$ states near ${}^{132}\mathrm{Sn}$ $(Zg~50).$ We trace the anomalous behavior in the Te isotopes to a reduced neutron pairing above the $N=82$ magic gap.