Information on $\beta$-decay properties of neutron-rich ${}^{47}\mathrm{Ar}$ was obtained at the ISOLDE facility at CERN using isobaric selectivity. This was achieved by a combination of a plasma-ion source with a cooled transfer line and subsequent mass separation. A doubly charged beam was used in order to improve the signal-to-background ratio associated with multi-charged noble gas fission products. The identification of the ${}^{47}\mathrm{Ar}$ $\gamma$-ray transitions was performed by comparing the spectra obtained from direct proton bombardment of the target and of the neutron converter. New excited levels in the daughter ${}^{47}\mathrm{K}$ nucleus corresponding to the negative-parity states were observed. The obtained data are compared to the result of large-scale shell model calculations and quasiparticle random-phase approximation predictions.

• Received 26 March 2004

DOI:https://doi.org/10.1103/PhysRevC.70.024304