Browse Teach Curate

Identifying the One-Quadrupole-Phonon Mixed-Symmetry State in 132Te

How experimental nuclear-structure physics pins down a mixed-symmetry 2+ state in a radioactive isotope. Students learn that measuring the M1 transition strength between low-lying 2+ states - here a large B(M1) - is the fingerprint that distinguishes the proton-neutron mixed-symmetry state from ordinary symmetric collective states, and how such an assignment is cross-checked against shell-model calculations and tracked across an isotonic chain as it approaches a magic shell closure.

B9 Text

Isolated mixed-symmetry 2+ state of the radioactive neutron-rich nuclide 132Te T. Stetz,1, ∗H.

Experimental nuclear-structure study of the radioactive neutron-rich isotope 132Te. Using the Doppler-shift attenuation method after a two-neutron transfer reaction on a 130Te target, the authors mea…