On the basis of recent ${}_{}{}^{193}{}_{}{}^{}\mathrm{Ir}(2n, \gamma ){}_{}{}^{195}{}_{}{}^{}\mathrm{Ir}$ reaction measurements, we have identified new low-spin positive-parity states and their electromagnetic deexcitations in ${}_{}{}^{195}{}_{}{}^{}\mathrm{Ir}$. All of the low-lying states can be classified as those expected in a nucleus with a $\mathrm{U}\left(\frac{6}{4}\right)$ supersymmetry within the framework of the interacting bosonfermion approximation model. In particular, the spacings of the lowest levels (with $\sigma ={\sigma }_{max}=\frac{13}{2}$) are repeated for another sequence, suggesting $\sigma =\frac{11}{2}$ and, in consequence, the applicability of a supersymmetry description to ${}_{}{}^{195}{}_{}{}^{}\mathrm{Ir}$.

• Received 18 August 1986

DOI:https://doi.org/10.1103/PhysRevLett.58.10