Measurements of Octupole Collectivity in \(^{90,91}\mathrm {Zr}\)

A Coulomb excitation experiment has been performed with the aim of populating the \(3^-_1\) state in \(^{90}\mathrm {Zr}\) at 2748 keV excitation energy with 88 MeV \(^{32}\mathrm {S}\) beam and particle–\(\gamma \) coincidence mode. A preliminary analysis has been performed to determine the electromagnetic matrix element. In a separate measurement, the octupole collective \(11/2^-_1\) state in \(^{91}\mathrm {Zr}\) has been populated by the \(^{82}\mathrm {Se}(^{13}\mathrm {C}, 4n)\) reaction. Significantly high \(B\)(E3) strength has been determined by measuring the lifetime of this state through the electronic fast timing method. Abstract Published by the Jagiellonian University 2026 authors