Experimental Study Of The Electromagnetic Transitions in Neutron-rich ²²F​

Excited states in the neutron-rich nucleus 22F were investigated using the 9Be(18O, α p)22F evaporation reaction. A 3 MeV/u 18O beam was delivered by the Argonne Tandem Linac Accelerator System (ATLAS). Prompt γ rays were detected using the 2π Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA), comprising 48 high-purity germanium crystals. The recoiling 22F residues were identified and se- lected via the α + p channel using the Fragment Mass Analyzer. Doppler-corrected γ-γ coincidence spectra revealed new levels and transition branches. A level scheme was constructed, showing evidence for intruder configurations. Spin and parity assignments were extracted from angular distribution and linear polarization measurements. The experimental results were compared with shell-model calculations using the Universal sd (USD) effective interaction, providing insight into configuration mixing and shell evolution near the neutron dripline.