[1] Univ Aquila, Dipartimento Fis, I-67010 Coppito, AQ, Italy
[2] Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, I-67010 Assergi, AQ, Italy
[3] Univ Napoli Federico II, Dipartimento Fis Ettore Pancini, Ist Nazl Fis Nucl, Sez Napoli, Compl Univ Monte S Angelo,Edificio G,Via Cinthia, I-80126 Naples, Italy
[4] Ist Nazl Fis Nucl, Sez Napoli, Compl. Univ Monte S Angel,Edificio G,Via Cinthia, I-80126 Naples, Italy
[5] Ist Nazl Fis Nucl, Gran Sasso Sci Inst, Viale F Crispi 7, I-67100 Laquila, Italy
[6] ICREA, Barcelona, Spain
[7] Inst Ciencies Espai IEEC CSIC, Campus UAB,Carrer de Can Magrans S-N, Barcelona 08193, Spain
[8] Tomsk State Univ Control Syst & Radioelect TUSUR, Lab Theor Cosmol, Tomsk 634050, Russia
[9] Tomsk State Pedag Univ, Tomsk 634061, Russia