Structure of F23 via β decay of O23

The nuclear states in {sup 23}F have been investigated following the {beta} decay of {sup 23}O. The measurement of {sup 23}O was carried out at the National Superconducting Cyclotron Laboratory using fragments from the reaction of a {sup 48}Ca beam in a Be target. The half-life and total neutron emission probability were determined to be 97(8) ms and 7(2)%, respectively, for {sup 23}O {beta} decay. Ten {gamma}-ray decays in {sup 23}F and a single {gamma}-ray in {sup 22}F were observed to establish the {beta} decay scheme for {sup 23}O. Shell model calculations are in reasonable agreement with the measured {beta} branching and B(GT) values for the lowest energy state. The excitation energies of the first 1/2{sup +} and 3/2{sup +} states have been determined to be 2243(8) and 4066(16) keV, respectively, indicating a widening of the 5/2{sup +}-1/2{sup +} state gap in {sup 23}F. The decay scheme of the largest contaminant {sup 26}Ne in the experiment was established.