Speaker
Description
The observation in the Lanthanides of low-lying states in nuclei with even Z, N having total angular momentum and parity I$^{\pi}$=3$^-$ is indicative of their undergoing octupole vibrations about a reflection-symmetric shape. Further evidence is provided by the sizeable value of the electric octupole (E3) moment for the transition to the ground state, indicating collective behaviour of the nucleons. Recently, the systematics of the E3 strength across the Gd isotopic chain has been studied and the results reveal that enhanced octupole collectivity is obtained for 150Gd. The energy of 3$^-$ state in 152Gd is similar with 150Gd. However, the B(E3) value is missing for 152Gd. The proposal is to achieve the direct determination of the octupole collectivity in 152Gd by a Coulomb excitation measurement.
