Exploring the Island of Inversion by a two neutron transfer reaction at REX-ISOLDE
K. Wimmer (T.U. Munchen-Germany)
salle 105 -14h
The Island of Inversion around 32Mg continues to be of great interest in the study of the evolution of shell structure in exotic nuclei. In particular the coexistence of spherical and deformed 0+ states in 30Mg and 32Mg on either side of the border of the Island of Inversion provides an important test for theoretical models. Whereas in 30Mg a deformed second 0+ state has been identified, in 32Mg the analogue to the 30Mg ground state, hence a spherical second 0+ state, has not been observed before.
In this talk I would like to report on results of one and two neutron transfer reactions in inverse kinematics at the REX-ISOLDE accelerator at CERN. Light charged particles emitted from the target were detected by the T-REX particle detector while gamma rays were detected by the MINIBALL gamma detector array.
The two neutron transfer reaction with a 30Mg beam involved for the first time the use of a radioactive Tritium target in combination with a radioactive ion beam. The analysis of excitation energies and angular distributions led to the first observation of the shape coexisting second 0+ state in 32Mg.
