Supersymmetry, recently proposed in the context of the interacting-boson model, is extended to include simultaneously odd-even, even-odd, and odd-odd partners of a given even-even nucleus. The quartet of nuclei ${}_{}{}^{196}{}_{}{}^{}\mathrm{Pt}$, ${}_{}{}^{197}{}_{}{}^{}\mathrm{Pt}$, ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$, and ${}_{}{}^{198}{}_{}{}^{}\mathrm{Au}$ is shown to be well described within this frame-work.

• Received 10 December 1984

DOI:https://doi.org/10.1103/PhysRevLett.54.653