Identification of new nuclei at and beyond the proton drip line near the doubly magic nucleusSn100

Abstract

The new neutron-deficient nuclei ${}_{}{}^{103}{}_{}{}^{}\mathrm{Sb}$, ${}_{}{}^{104}{}_{}{}^{}\mathrm{Sb}$, ${}_{}{}^{98}{}_{}{}^{}\mathrm{In}$, ${}_{}{}^{91}{}_{}{}^{}\mathrm{Pd}$, ${}_{}{}^{89}{}_{}{}^{}\mathrm{Rh}$, and ${}_{}{}^{87}{}_{}{}^{}\mathrm{Ru}$ have been identified among the quasifragmentation products of a ${}_{}{}^{112}{}_{}{}^{}\mathrm{Sn}$ beam (63 MeV/nucleon). The fragment identification based on energy-loss, total kinetic energy, and time-of-flight measurements has been independently confirmed via observation of γ radiation following the decay of known short-lived isomers. The region of known isotopes is extended to the predicted proton drip line for indium and silver, and beyond it for antimony and rhodium.