Coulomb Excitation of Radioactive132,134,136TeBeams and the LowB(E2)of136Te

Abstract

The $B({E2;0\mathrm{}}^{+}\to 2^{+})$ values for the first $2^{+}$ excited states of neutron-rich ${}^{132,134,136}\mathrm{Te}$ have been measured using Coulomb excitation of radioactive ion beams. The $B\left(E2\mathrm{}\right)$ values obtained for ${}^{132,134}\mathrm{Te}$ are in excellent agreement with expectations based on the systematics of heavy stable Te isotopes, while that for ${}^{136}\mathrm{Te}$ is unexpectedly small. These results are discussed in terms of proton-neutron configuration mixing and shell-model calculations using realistic effective interactions.