Lifetimes in neutron-rich fission fragments using the differential recoil distance method

Lifetimes in the neutron-rich nuclei ${}^{104}\mathrm{Mo},$ ${}^{110}\mathrm{Ru},$ and ${}^{144}\mathrm{Ba}$ were measured using the differential recoil distance method. The experiment was performed with a ${}^{252}\mathrm{Cf}$ fission source inside the New Yale Plunger Device. $\ensuremath{\gamma}$ rays were detected by the SPEctrometer for Experiments with Doppler shifts at Yale (SPEEDY) while fission fragments with the appropriate kinematics were detected by an array of photocells.