Multipole mixing ratio of the 2+3 → 2+1 transition in 132Te

Determine the multipole mixing ratio for the 2+3 → 2+1 γ-ray transition in 132Te to establish the relative M1 and E2 contributions; current analyses provide only upper limits on the corresponding transition strengths because the mixing ratio is unknown.

Background

The proximity of the 2+3 level to the 2+2 level makes it a candidate for potential fragmentation of mixed-symmetry strength. The present work measures the 2+3 lifetime and sets upper limits on its M1 and E2 components to the 2+1 state, but cannot separate the multipolar contributions without the mixing ratio.

A precise determination of the 2+3 → 2+1 multipole mixing ratio would clarify whether any mixed-symmetry strength resides in the 2+3 state and refine constraints on configuration mixing.

References

Due to the unknown multipole mixing ratio for the $2+_3$\,$\rightarrow$\,$2+_1$ transition, upper limits are given for the respective $M1$ and $E2$ transition strengths.

— Isolated one-phonon mixed-symmetry 2+ state of the radioactive neutron-rich nuclide 132Te (2501.01436 - Stetz et al., 20 Dec 2024) in Table II caption (Transition strengths), Analysis Section