1. Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Joliot-Curie 6, RU-141980, Dubna, Moscow Region, Russia
2. Institute for Theoretical and Experimental Physics, Bolshaya Cheremushkinskaya, 25, RU-117218, Moscow, Russia
3. Dzhelepov Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, Joliot-Curie 6, RU-141980, Dubna, Moscow Region, Russia
4. Physics Department of Irkutsk State University, Gagarin Boulevard, 20, RU-664003, Irkutsk, Russia
5. Dipartimento di Fisica, Università di Firenze & INFN Sezione di Firenze, I-50019, Sesto Fiorentino (FI), Italy