Typical M1 strength between fully-symmetric 2+ states needed for mixing analyses

Ascertain the magnitude of the B(M1) transition strength between fully-symmetric quadrupole 2+ states (e.g., B(M1; 2+fs → 2+1)), expected to be near zero but not yet measured, to provide required input for two-state mixing calculations of the 2+2 and 2+3 levels in 132Te.

Background

To quantify the mixing between fully symmetric and mixed-symmetry configurations, the authors employ a two-state mixing model that requires the typical M1 strength between fully-symmetric 2+ states. Although theoretically expected to be small, the absence of experimental values forces them to adopt conservative assumptions and derive an upper limit on the mixing matrix element.

Measuring this typical M1 strength would tighten constraints on mixing analyses, improve identification of mixed-symmetry fragments, and refine the understanding of proton–neutron symmetry restoration near shell closures.