Evidence for Fast-Neutron Emission from the Giant Quadrupole Resonance inSn119

Fast-neutron emission from the giant quadrupole resonance in ${}_{}{}^{119}{}_{}{}^{}\mathrm{Sn}$ was studied for the first time by measuring the deexciting neutrons in coincidence with the inelastic ${\alpha }^{\prime }$ from the reaction ${}_{}{}^{119}{}_{}{}^{}\mathrm{Sn}(\alpha , {\alpha }^{\prime })$. The neutron time-of-flight spectrum shows both the slow evaporation component corresponding to the spreading process and the fast component corresponding to the direct escape leading to single-hole states in the residual nucleus ${}_{}{}^{118}{}_{}{}^{}\mathrm{Sn}$.