Gamma-ray and conversion electron singles and coincidence spectroscopy have been performed on the decay of 6.2-h ${}_{}{}^{127}{}_{}{}^{}\mathrm{Cs}$ to levels of ${}_{}{}^{127}{}_{}{}^{}\mathrm{Xe}$ and 30-h ${}_{}{}^{129}{}_{}{}^{}\mathrm{Cs}$ to levels of ${}_{}{}^{129}{}_{}{}^{}\mathrm{Xe}$. From these data, new levels, transition multipolarities, and spin and parity assignments are derived. The systematic structure of the odd-mass Xe nuclides with 69≤N<81 is shown and the results of various calculations are discussed. Support for the use of relatively weak coupling models to describe these nuclides is enumerated.

• Received 14 December 1989

DOI:https://doi.org/10.1103/PhysRevC.42.902