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1. First results from the DarkSide-50 dark matter experiment at Laboratori Nazionali del Gran Sasso

Author

P. Agnes, T. Alexander, A. Alton, K. Arisaka, H.O. Back, B. Baldin, K. Biery, G. Bonfini, M. Bossa, A. Brigatti, J. Brodsky, F. Budano, L. Cadonati, F. Calaprice, N. Canci, A. Candela, H. Cao, M. Cariello, P. Cavalcante, A. Chavarria, A. Chepurnov, A.G. Cocco, L. Crippa, D. D'Angelo, M. D'Incecco, S. Davini, M. De Deo, A. Derbin, A. Devoto, F. Di Eusanio, G. Di Pietro, E. Edkins, A. Empl, A. Fan, G. Fiorillo, K. Fomenko, G. Forster, D. Franco, F. Gabriele, C. Galbiati, A. Goretti, L. Grandi, M. Gromov, M.Y. Guan, Y. Guardincerri, B. Hackett, K. Herner, E.V. Hungerford, Al. Ianni, An. Ianni, C. Jollet, K. Keeter, C. Kendziora, S. Kidner, V. Kobychev, G. Koh, D. Korablev, G. Korga, A. Kurlej, P.X. Li, B. Loer, P. Lombardi, C. Love, L. Ludhova, S. Luitz, Y.Q. Ma, I. Machulin, A. Mandarano, S. Mari, J. Maricic, L. Marini, C.J. Martoff, A. Meregaglia, E. Meroni, P.D. Meyers, R. Milincic, D. Montanari, A. Monte, M. Montuschi, M.E. Monzani, P. Mosteiro, B. Mount, V. Muratova, P. Musico, A. Nelson, S. Odrowski, M. Okounkova, M. Orsini, F. Ortica, L. Pagani, M. Pallavicini, E. Pantic, L. Papp, S. Parmeggiano, R. Parsells, K. Pelczar, N. Pelliccia, S. Perasso, A. Pocar, S. Pordes, D. Pugachev, H. Qian, K. Randle, G. Ranucci, A. Razeto, B. Reinhold, A. Renshaw, A. Romani, B. Rossi, N. Rossi, S.D. Rountree, D. Sablone, P. Saggese, R. Saldanha, W. Sands, S. Sangiorgio, E. Segreto, D. Semenov, E. Shields, M. Skorokhvatov, O. Smirnov, A. Sotnikov, C. Stanford, Y. Suvorov, R. Tartaglia, J. Tatarowicz, G. Testera, A. Tonazzo, E. Unzhakov, R.B. Vogelaar, M. Wada, S. Walker, H. Wang, Y. Wang, A. Watson, S. Westerdale, M. Wojcik, A. Wright, X. Xiang, J. Xu, C.G. Yang, J. Yoo, S. Zavatarelli, A. Zec, C. Zhu, and G. Zuzel

Subjects
Physics, QC1-999
Abstract

We report the first results of DarkSide-50, a direct search for dark matter operating in the underground Laboratori Nazionali del Gran Sasso (LNGS) and searching for the rare nuclear recoils possibly induced by weakly interacting massive particles (WIMPs). The dark matter detector is a Liquid Argon Time Projection Chamber with a (46.4±0.7) kg active mass, operated inside a 30 t organic liquid scintillator neutron veto, which is in turn installed at the center of a 1 kt water Cherenkov veto for the residual flux of cosmic rays. We report here the null results of a dark matter search for a (1422±67) kgd exposure with an atmospheric argon fill. This is the most sensitive dark matter search performed with an argon target, corresponding to a 90% CL upper limit on the WIMP-nucleon spin-independent cross section of 6.1×10−44 cm2 for a WIMP mass of 100 Gev/c2. Keywords: Dark matter, WIMP, Noble liquid detectors, Low-background detectors, Liquid scintillators

Published
2015
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2. Search for electron decay mode e→γ+νwith prototype of Borexino detector

Author

Back, H.O, Balata, M, de Bari, A, Beau, T, de Bellefon, A, Bellini, G, Benziger, J, Bonetti, S, Buck, C, Caccianiga, B, Cadonati, L, Calaprice, F, Cecchet, G, Chen, M, Di Credico, A, Dadoun, O, D'Angelo, D, Derbin, A, Deutsch, M, Elisei, F, Etenko, A, von Feilitzsch, F, Fernholz, R, Ford, R, Franco, D, Freudiger, B, Galbiati, C, Gatti, F, Gazzana, S, Giammarchi, M.G, Giugni, D, Goeger-Neff, M, Golubchikov, A, Goretti, A, Grieb, C, Hagner, C, Hagner, T, Hampel, W, Harding, B, Hartmann, F.X, Heusser, G, Ianni, A, Ianni, A.M, de Kerret, H, Kiko, J, Kirsten, T, Korga, G, Korschinek, G, Kozlov, Y, Kryn, D, Laubenstein, M, Lendvai, C, Lombardi, P, Machulin, I, Malvezzi, S, Maneira, J, Manno, I, Manuzio, G, Masetti, F, Martemianov, A, Mazzucato, U, McCarty, K, Meroni, E, Miramonti, L, Monzani, M.E, Musico, P, Neder, H, Niedermeier, L, Obolensky, M, Ortica, F, Pallavicini, M, Papp, L, Perasso, L, Pocar, A, Raghavan, R.S, Ranucci, G, Rau, W, Razeto, A, Resconi, E, Sabelnikov, A, Salvo, C, Scardaoni, R, Schoenert, S, Seidel, H, Simgen, H, Shutt, T, Skorokhvatov, M, Smirnov, O, Sonnenschein, A, Sotnikov, A, Sukhotin, S, Tarasenkov, V, Tartaglia, R, Testera, G, Vignaud, D, Vitale, S, Vogelaar, R.B, Vyrodov, V, Wojcik, M, Zaimidoroga, O, Zuzel, G, and Oberauer, L

Abstract

The prototype of the Borexino detector Counting Test Facility, located in the Gran-Sasso laboratory, has been used to obtain a bound on the stability of the electron. The new lower limit on the mean lifetime defined on 32.1 days of data set is τ(e−→νe+γ)⩾4.6×1026yr (90% c.l.).

Published
2002
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