The evidence of N = 16 shell closure and β-delayed neutron emission from 25F

We measured the β-delayed neutron emission from 25F for the first time at the Facility for Rare Isotope Beams (FRIB). Using combined neutron and γ-ray detector systems of the FRIB Decay Station Initiator (FDSi), we observed β-decay transitions populating neutron unbound states between 4.2 and 8 MeV in 25Ne. The experimental results led to the revision of the β-decay half-life and β-delayed neutron-emission probability of 25F. The β-decay strength distribution of 25F extracted from the data agrees with the shell-model predictions using the USDB and SDPF-M effective interactions. This result indicates that the spherical neutron N=16 shell gap persists in 25F and 25Ne.