β-delayed neutron emission of ²⁵F

In the neutron-rich region around Z = 8 a nuclear shell gap at N = 16 is known to form a doubly magic ²⁴O. The core of ²⁵F shows a lack of spectroscopic overlap with a ²⁴O in a p, 2p knockout reaction (T. L. Tang et al, Phys. Rev. Lett. 124, 212502 (2020)), but same study shows altering single particle energies to reduce the N = 16 shell gap by ~4.2 MeV from the prediction within the USDB interaction yields an accurate prediction of spectroscopic factors observed in ²⁵F. The energy spectrum of β-delayed neutron of emission for ²⁵F was studied at the Facility for Rare Isotope Beams at Michigan State University in order to further investigate the evolution of this effective N = 16 shell gap. B(GT), as obtained by our study, was in agreement with the prediction of the original USDB interaction, implying a larger effective N = 16 shell gap in ²⁵F than the measured spectroscopic factors would imply. In this study, the half-life and P_n were also remeasured to be much higher than previously observed.