1. Grand Accélérateur National d’Ions Lourds, Bd Henri Becquerel, 14076 Caen, France
2. European Organization for Nuclear Research, Esplanade des Particules 1, 1211 Geneva 23, Switzerland
3. Univ. Grenobles Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 53 Avenue des Martyrs, 38000 Grenoble, France
4. National Institute for Nuclear Physics (INFN), Laboratori Nationali di Legnaro, I-35020 Legnaro PD, Italy
5. Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA