[1] Southern Fed Univ, Phys Dept, Rostov Na Donu 344090, Russia
[2] Ist Nazl Fis Nucl, Lab Nazl Frascati, Via Enrico Fermi 54, I-00044 Frascati, Italy
[3] RICMASS Rome Int Ctr Mat Sci Superstripes, I-00185 Rome, Italy
[4] CNR, Ist Struttura Mat, Via Fosso Cavaliere 100, I-00133 Rome, Italy
[5] RAS, PN Lebedev Phys Inst, Moscow 119991, Russia
[6] NR Nucl Univ MEPhI, Moscow 115409, Russia
[7] CNR, IOM, Lab Nazl TASC, Basovizza SS 14,Km 163-5, I-34012 Trieste, Italy