Abstract
Backbending phenomena and low-lying collective states in the nucleus ${}^{132}\mathrm{Ba}$ are studied in terms of a pair-truncated shell model with the monopole and quadrupole pairing plus quadrupole-quadrupole interaction. The model reproduces well experimental energy levels, transition rates, and g factors for both low-lying states and those around the backbending region. The collective pair truncation of the shell-model space yields remarkable results for low-lying states, and the alignment of two ${0h}_{11/2}$ neutrons plays a decisive role in describing the backbending.
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