Fission-produced nuclides ${}_{}{}^{94}{}_{}{}^{}\mathrm{Kr}$ and ${}_{}{}^{143}{}_{}{}^{}\mathrm{Xe}$ have been measured directly using on-line mass separation. The half-lives derived from the $\beta$-decay curve are 0.20 ± 0.01 and 0.3 ± 0.03 sec, respectively. $\gamma$-ray spectra in the mass chain 93 have been measured and various $\gamma$ peaks were assigned to the individual nuclides.

• Received 16 September 1971

DOI:https://doi.org/10.1103/PhysRevC.5.270