[1] Univ Salerno, Dipartimento Fis ER Caianiello, Via Giovanni Paolo II,132, Fisciano I-84084, SA, Italy
[2] Ist Nazl Fis Nucl, Grp Coll Salerno, Via Giovanni Paolo II,32, I-84084 Fisciano, SA, Italy
[3] Ist Nazl Fis Nucl, Sez Napoli, Grp Coll Salerno, Salerno, Italy
[4] Univ Napoli Federico II, Dipartimento Fis E Pancini, Via Cinthia, I-80126 Naples, Italy
[5] Ist Nazl Fis Nucl, Sez Napoli, Via Cinthia 9, I-80126 Naples, Italy
[6] Scuola Super Merid, Largo S Marcellino 10, I-80138 Naples, Italy
[7] Univ Camerino, Sch Sci & Technol, Via Madonna Carceri, I-62032 Camerino, MC, Italy