Bose–Fermi symmetry in the odd–even gold isotopes

Abstract

Abstract In this work the results of an in-beam experiment on 195 Au are presented, yielding new spins, multipole mixing ratios, and new low-lying states essential for the understanding of this nucleus. The positive-parity states from this work together with compiled data from the available literature for 185–199 Au are compared to Interacting Boson Fermion Model calculations employing the Spin(6) Bose–Fermi symmetry. The evolution of the parameters for the τ splitting and the J splitting reveals a smooth behavior. Thereby, a common description based on the Bose–Fermi symmetry is found for 189–199 Au. Furthermore, the calculated E 2 transition strengths are compared to experimental values with fixed effective boson and fermion charges for all odd–even gold isotopes, emphasizing that the Spin(6) Bose–Fermi symmetry is valid for the gold isotopes.