High spin states in the N=50 nucleus ${}_{}{}^{93}{}_{}{}^{}\mathrm{Tc}$ were populated and studied using the reaction ${}_{}{}^{66}{}_{}{}^{}\mathrm{Zn}$ ${(}^{31}$P, 2p2n${)}^{93}$Tc at a beam energy of 115 MeV. Gamma ray intensities and gamma-gamma coincidences were measured. Multipolarities of the transitions were extracted assuming stretched transitions. The positive and negative parity bands have been extended up to spins 39/$2^{+}$ and 43/$2^{\mathrm{-}}$, respectively. The proposed level scheme above J=25/2 cannot be well understood on the basis of the spherical shell model calculations with valence protons occupying the (1${\mathit{f}}_{5/2}$,2${\mathit{p}}_{3/2}$,2${\mathit{p}}_{1/2}$,1${\mathit{g}}_{9/2}$) configuration space. The breaking of the N=50 neutron core appears to be a plausible mechanism for the observed high spin states.

• Received 2 September 1992

DOI:https://doi.org/10.1103/PhysRevC.47.87