Deformation in ¹²⁰Te Described Experimentally by Quadrupole Invariants

The last stable tellurium nucleus on the neutron-deficient side, ¹²⁰Te, was Coulomb excited using two different projectiles. The low-lying collective states were populated in a multi-step Coulomb excitation process. Magnitudes and relative signs of the reduced E2 matrix elements were determined using the GOSIA code. The resulting set of E2 matrix elements was analysed using the quadrupole sum rules approach to determine the quadrupole deformation parameters for the 0 _1⁺ and 2_1⁺ states.