Proposal to the ISOLDE and Neutron Time-of-Flight Committee Coulomb excitation of doubly magic 132 Sn with MINIBALL at HIE-ISOLDE 3 . October 2012

We propose to study the vibrational first 2 and 3 states of the doubly magic nucleus Sn via Coulomb excitation using the HIE-ISOLDE facility coupled with the highly efficient MINIBALL array. The intense Sn beam at ISOLDE, the high beam energy of HIE-ISOLDE, the high energy resolution and good efficiency of the MINIBALL provide a unique combination and favourable advantages to master this demanding measurement. Reliable B(E2,0 2) values for neutron deficient Sn were obtained with the MINIBALL at REX-ISOLDE. These measurements can be extended up to and beyond the shell closure at the neutron-rich side with Sn. The results on excited collective states in Sn will provide crucial information on 2p-2h cross shell configurations which are expected to be dominated by a strong proton contribution. Predictions are made within various large scale shell model calculations and new mean field calculations within the framework of different approaches utilising the random phase approximation and the quasi-particle random phase approximation. Requested shifts: 18 shifts Beamline: MINIBALL + T-REX