Spectroscopy of ${}^{26}$F to probe proton-neutron forces close to the drip line

A. Lepailleur, O. Sorlin, L. Caceres +19

A long-lived $J^{\pi }=4_1^{+}$ isomer, $T_{1/2}=2.2(1)$ms, has been discovered at 643.4(1) keV in the weakly-bound ${}_9^{26}$F nucleus. It was populated at GANIL in the fragmentation of…