Excited states of the neutron-deficient ${}^{103}\mathrm{Cd}$ nucleus have been investigated via the ${}^{72}\mathrm{Ge}$(${}^{35}\mathrm{Cl}$, $p3n$) reaction at beam energy of 135 MeV by use of in-beam spectroscopic methods. Gamma rays depopulating the excited states were detected using the Gammasphere spectrometer with high-fold γ-ray coincidences. A quadrupole γ-ray coincidence analysis (${\gamma }^4$) has been used to extend the known level scheme. The positive-parity levels have been established up to $J=35/2\hslash$ and $E_x=7.071$ MeV. In addition to the observation of a highly fragmented level scheme belonging to the positive-parity sequences at $E_x~5$ MeV, the termination of a negative-parity sequence connected by $E2$ transitions has been established at $J=47/2\hslash$ and $E_x=11.877$ MeV. The experimental results corresponding to both the positive- and negative-parity sequences have been theoretically interpreted in the framework of the core particle coupling model. Evidence is presented for a shape change from collective prolate to noncollective oblate above the $J^{\pi }=39/2^{-}$ (8011-keV) level and for a smooth termination of the negative-parity band.

• Received 4 April 2007

DOI:https://doi.org/10.1103/PhysRevC.76.044327