Speaker
Description
We propose to investigate the phenomenon of multiple-shape coexistence in the $Z\approx50$ region by performing a multi-step Coulomb-excitation measurement of $^{120}$Sn using the AGATA+SPIDER setup.
The aim of the experiment is the measurement of the electromagnetic properties of the low-lying states in $^{120}$Sn, in particular the spectroscopic quadrupole moments of the $2_{1,2,3}^+$ excited states.
Such results will allow us to determine the quadrupole-deformation parameters $(\beta_2, \gamma)$ of the $0_{1,2}^+$ states, as well as the deformation strength of $0_3^+$ headband.
The outcome of the measurement will allow us to shed light on the phenomenon of shape coexistence in the neutron-rich $Z\approx50$ region, providing demanding test for state-of-the-art theoretical models which propose contradicting interpretation of the shape evolution for the Sn isotopic chain.
