Smooth terminating bands inTe112: Particle-hole induced collectivity

Abstract

The Gammasphere spectrometer, in conjunction with the Microball charged-particle array, was used to investigate high-spin states in $^{112}\mathrm{Te}$ via $^{58}\mathrm{Ni}$($^{58}\mathrm{Ni}$, $4p\ensuremath{\gamma}$) reactions at 240 and 250 MeV. Several smooth terminating bands were established, and lifetime measurements were performed for the strongest one using the Doppler-shift attenuation method. Results obtained in the spin range $18\text{\ensuremath{-}}32\ensuremath{\hbar}$ yield a transition quadrupole moment of $4.0\ifmmode\pm\else\textpm\fi{}0.5\mathit{eb}$, which corresponds to a quadrupole deformation ${\ensuremath{\varepsilon}}_{2}=0.26\ifmmode\pm\else\textpm\fi{}0.03$; this value is significantly larger than the ground-state deformation of tellurium isotopes. It was also possible to extract a transition quadrupole moment for the yrast band in $^{114}\mathrm{Xe}$, produced via the $58$Ni ($58$Ni, $2p\ensuremath{\gamma}$) reaction. A value of $3.0\ifmmode\pm\else\textpm\fi{}0.5\mathit{eb}$ was found in the spin range $16\text{\ensuremath{-}}24\ensuremath{\hbar}$, which corresponds to a quadrupole deformation ${\ensuremath{\varepsilon}}_{2}=0.19\ifmmode\pm\else\textpm\fi{}0.03$. Cranked Nilsson-Strutinsky calculations are used to interpret the results.