Beta Decay of Nutron-Rich Nuclei near N=20

Neutron-rich isotopes below ⁴⁰Ca, a region collectively known as the “island of inversion”, is dominated by deformation arising from the diminishing N=20 shell gap.  Isotopes in this region of deformation have been particularly important to our understanding of the evolution of magic numbers from stability towards the neutron dripline.  Recently, the beta-decay of isotopes along the southern boundary of the island of inversion has been performed using the CCF at the NSCL.  A 48Ca beam was fragmented, the secondary beam was centered around 31Ne isotopes were subsequently selected using the A1900 separator and implanted in the BCS, allowing event-by-event particle identification and analysis to be performed. Excited states in the daughter nuclei are identified by emitted γ-rays collected with 16 Clover-style HPGe and 15 LaBr3 detectors surrounding the BCS in a rhombicuboctahedron geometry.  The current presentation will highlight the analysis process and as well as the structure of exotic Mg and Na isotopes.