The energy spectra of the parent and daughter nuclei in the β decays (${}^{121\text{−}127}\mathrm{Xe}$,${\beta }^{+}$${}^{121\text{−}127}\mathrm{I}$) are considered in the interacting boson fermion model (IBFM-2) with the $g_{7/2},d_{5/2},d_{3/2},s_{1/2}$, and $h_{11/2}$ single-particle orbitals. Electromagnetic transition probabilities and branching ratios in odd ${}^{121\text{−}127}\mathrm{I}$ isotopes are investigated. Special attention is given to the occurrence of mixed symmetry states, and the $F$-spin structures of the wave functions are analyzed. The $\log {}_{10}\mathit{ft}$ values of the allowed β decay transitions are calculated. It is found that the IBFM-2 results agree with the experimental data quite well.

• Received 1 January 2009

DOI:https://doi.org/10.1103/PhysRevC.80.014306