1. Department of Physics G. Occhialini, University of Milano-Bicocca, Milan, Italy
2. Milano-Bicocca Division, INFN, Milan, Italy
3. Department of Physics, University of Pavia, Pavia Division, INFN, Pavia, Italy
4. ISIS Neutron and Muon Source, STFC, Didcot, UK
5. Laboratori Nazionali del Gran Sasso (LNGS), INFN, Assergi - L'Aquila, Italy
6. Department of Earth and Environmental Sciences (DISAT), University of Milano-Bicocca, Milan, Italy
7. Department of Earth and Environmental Sciences, University of Pavia, Pavia, Italy
8. Arvedi Laboratory, CISRiC, University of Pavia, Pavia, Italy