Decay Energies of Gaseous Fission Products and their Daughters forA=88 to 93

A systematic study of $\beta$-decay energies has been made for mass-separated activities of Kr gaseous fission products and their daughters at the TRISTAN on-line separator facility at the Ames Laboratory research reactor. A well-type plastic scintillator was used in coincidence with a Ge(Li) $\gamma$ detector to determine $\beta$-group end-point energies and deduce $Q$ values. The following $\beta$-decay energies have been determined: ${}_{}{}^{88}{}_{}{}^{}\mathrm{Kr}$, 2.93 ± 0.03 MeV; ${}_{}{}^{88}{}_{}{}^{}\mathrm{Rb}$, 5.30 ± 0.06 MeV; ${}_{}{}^{89}{}_{}{}^{}\mathrm{Kr}$, 4.93 ± 0.06 MeV; ${}_{}{}^{90}{}_{}{}^{}\mathrm{Kr}$, 4.35 ± 0.05 MeV; ${}_{}{}^{90}{}_{}{}^{}\mathrm{Rb}$, 6.32 ± 0.07 MeV; ${}_{}{}^{91}{}_{}{}^{}\mathrm{Kr}$, 6.12 ± 0.07 MeV; ${}_{}{}^{91}{}_{}{}^{}\mathrm{Rb}$, 5.68 ± 0.04 MeV; ${}_{}{}^{92}{}_{}{}^{}\mathrm{Kr}$, 5.97 ± 0.08 MeV; ${}_{}{}^{92}{}_{}{}^{}\mathrm{Rb}$, 7.58 ± 0.15 MeV; ${}_{}{}^{92}{}_{}{}^{}\mathrm{Sr}$, 1.93 ± 0.03 MeV; ${}_{}{}^{93}{}_{}{}^{}\mathrm{Kr}$, 8.3 ± 0.5 MeV; and ${}_{}{}^{93}{}_{}{}^{}\mathrm{Rb}$, 7.23 ± 0.10 MeV. The decay energies are compared with previous measurements, systematics predictions, and two currently accepted mass relations. The energies are used to predict the $\beta$-decay energies for 13 additional nuclei by means of systematics.