Status and ﬁrst results of the NEMO Phase-2 tower

Chiarusi, T.; Aiello, S.; Ameli, F.; Anghinolﬁ, M.; Barbarino, G.; Barbarito, E.; Barbato, F.; Beverini, N.; Biagi, S.; Bouhadef, B.; Bozza, C.; Cacopardo, G.; Calamai, M.; Cal`ı, C.; Capone, A.; Caruso, F.; Ceres, A.; Circella, M.; Cocimano, R.; Coniglione, R.; Costa, M.; Cuttone, G.; D’Amato, C.; D’Amato, V.; D’Amico, A.; Debonis, G.; De Luca, V.; Deniskina, N.; De Rosa, G.; Distefano, C.; Fermani, P.; Flaminio, V.; Fusco, L. A.; Garuﬁ, F.; Giordano, V.; Giovanetti, G.; Gmerk, A.; Grasso, Rosaria; Grella, G.; Hugon, C.; Imbesi, M.; Kulikovsky, V.; Larosa, G.; Lattuada, D.; Leonora, E.; Litrico, P.; Lonardo, A.; Longhitano, F.; LO PRESTI, Domenico; Maccioni, E.; Margiotta, A.; Martini, A.; Masullo, R.; Migliozzi, P.; Migneco, E.; Miraglia, A.; Mollo, C.; Mongelli, M.; Morganti, M.; Musico, P.; Musumeci, M.; Nicolau, C. A.; Orlando, A.; Papaleo, R.; Pellegrino, C.; Pellegriti, M. G.; Perrina, C.; Piattelli, P.; Pugliatti, C.; Pulvirenti, S.; Raffaelli, F.; Randazzo, N.; Riccobene, G.; Rovelli, A.; Sanguineti, M.; Sapienza, P.; Sgura, I.; Simeone, F.; Sipala, V.; Spurio, M.; Speziale, F.; Spitaleri, A.; Taiuti, M.; Terreni, G.; Trasatti, L.; Trovato, A.; Ventura, C.; Vicini, P.; Viola, S.; Vivolo, D.

doi:10.1088/1748-0221/9/03/C03045

In March 2013, the NEMO Phase 2 tower has been successfully installed in the CapoPassero site, at a depth of 3500 m and 80 km off from the southern coast of Sicily. The unfurledtower is 450 m high; it is composed of 8 mechanical ﬂoors, for a total amount of 32 PMTs andvarious instruments for environmental measurements. The tower positioning is achieved by anacoustic system. The tower is continuously acquiring and transmitting all the measured signalsto shore. Data reduction is completely performed in the Portopalo shore station by a dedicatedcomputing facility connected to the persistent storage system at LNS, in Catania. Results from thelast 9 months of acquisition will be presented. In particular, the analyzed optical rates, showingstable and low baseline values, are compatible with the contribution mainly of 40K light emission,with a small percentage of light bursts due to bioluminescence. These features reveal the optimalnature of the Capo Passero abyssal site to host a km3-sized Neutrino Telescope.