Anomalous Properties of Quadrupole Collective States in 136Te and beyond
Noritaka Shimizu, Takaharu Otsuka, Takahiro Mizusaki, Michio Honma
Abstract
The ground and low-lying states of neutron-rich exotic Te and Sn isotopes are studied in terms of the nuclear shell model by the same Hamiltonian used for the spherical-deformed shape phase transition of Ba isotopes, without any adjustment. An anomalously small value is obtained for B(E2;0+1 2+1) in 136Te, consistently with a recent experiment. The levels of 136Te up to yrast 12+ are shown to be in agreement with observed ones. It is pointed out that 136Te can be an exceptionally suitable case for studying mixed-symmetry 1+, 2+ and 3+ states, and predictions are made for energies, M1 and E2 properties. Systematic trends of structure of heavier and more exotic Sn and Te isotopes beyond 136Te are studied by Monte Carlo Shell Model, presenting an unusual and very slow evolution of collectivity/deformation.
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