γ-ray spectroscopy ofHf166:X(5)inN>90?

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Abstract

Excited states in $^{166}\mathrm{Hf}$ were populated in the ${\ensuremath{\beta}}^{+}/\ensuremath{\epsilon}$ decay of $^{166}\mathrm{Ta}$ and studied through off-beam $\ensuremath{\gamma}$-ray spectroscopy at the Yale moving tape collector. New coincidence data found no support for two previously reported excited ${0}^{+}$ states and led to a substantially revised level scheme. Similarities between the revised level scheme of $^{166}\mathrm{Hf}$ and the X(5) critical point symmetry are discussed, and the extent of X(5) behavior in this mass region is explored through the W and Os isotopes. Among X(5) candidates with $N>90$, good agreement is observed for most energies and interband $B(E2)$ strengths, while all exhibit similar disagreements with other key observables, in particular, yrast $B(E2)$ values and spacing in the excited $K = {0}^{+}$ sequence.

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