1. Dipartimento di Fisica, Università di Roma “Tor Vergata”, 00133 Rome, Italy
2. INFN, Sezione di Roma “Tor Vergata”, 00133 Rome, Italy
3. INFN, Sezione di Roma, 00185 Rome, Italy
4. Dipartimento di Fisica, Università di Roma “La Sapienza”, 00185 Rome, Italy
5. INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi, AQ, Italy
6. Department of Physics, Engineering Physics and Astronomy, Queen’s University, Kingston, ON K7L 3N6, Canada
7. Arthur B. McDonald Canadian Astroparticle Physics Research Institute, Kingston, ON K7L 3N6, Canada
8. Department of Chemistry, Queen’s University, Kingston, ON K7L 3N6, Canada