Coulomb Excitation of Proton-rich $N = 80$ Isotones at HIE-ISOLDE

A projectile Coulomb-excitation experiment was performed at the radioactive ion beam facility HIE-ISOLDE at CERN. The radioactive $^{140}$Nd and $^{142}$Sm ions were post accelerated to the energy of 4.62 MeV/A and impinged on a 1.45 mg/cm$^2$-thin $^{208}$Pb target. The $\gamma$ rays depopulating the Coulomb-excited states were recorded by the HPGe-array MINIBALL. The scattered charged particles were detected by a double-sided silicon strip detector in forward direction. Experimental γ-ray intensities were used for the determination of electromagnetic transition matrix elements. Preliminary results for the reduced transition strength of the $\textrm{B}(M1;2^+_3 \to 2^+_1)=035(19) \mu^2_N$ of $^{140}$Nd and a first estimation for $^{142}$Sm have been deduced using the Coulomb-excitation calculation software GOSIA. The states of $^{140}$Nd and $^{142}$Sm show indications of being the main fragment of the proton-neutron mixed-symmetry $2^+_{1,\textrm{ms}}$ state.