a Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, 56127, Pisa, Italy
b GANIL, CEA/DSM-CNRS/IN2P3 BP 5027, F-14076, Caen cedex 5, France
c Department of Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, UK
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