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51. [Untitled]

Author

J. Holeczek, S. Mania, D. Kielczewska, A. Zalewska, D. Stefan, Jan Kisiel, M. Szarska, M. Szeptycka, T. J. Palczewski, Jan T. Sobczyk, M. Posiadala, P. Mijakowski, K. Cieślik, J. Łagoda, I. Kochanek, T. Szeglowski, A. Dąbrowska, T. Wąchała, E. Rondio, T. Kozłowski, P. Przewlocki, J. Stepaniak, and R. Sulej

Subjects
Nuclear physics, ICARUS, Physics, Underground laboratory, General Physics and Astronomy, Art history
Abstract

Institute of Physics, University of Silesia Uniwersytecka 4, 40-007 Katowice, Poland H. Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152, 31-342 Krakow, Poland Institute of Experimental Physics, University of Warsaw Hoza 69, 00-681 Warsaw, Poland A. Soltan Institute for Nuclear Studies, Otwock-Świerk, Poland Institute of Theoretical Physics, University of Wroclaw M. Borna 9, 50-204 Wroclaw, Poland

Published
2011

52. Precise 3D track reconstruction algorithm for the ICARUS T600 liquid argon time projection chamber detector

Author

N. Canci, K. Zaremba, S. Mania, R. Sulej, F. Pietropaolo, A. Guglielmi, R. Dolfini, M. Terrani, D. Stefan, G. Meng, A. Ivashkin, Christian Farnese, Carlo Rubbia, B. Baibussinov, J. Holeczek, Alfredo G. Cocco, Daniele Dequal, A. Dermenev, A. Scaramelli, Massimo Rossella, K. Cieslik, Angela Fava, X. Yang, C. Montanari, M. Haranczyk, S. Centro, F. Sergiampietri, C. Vignoli, E. Segreto, S. N. Gninenko, P. Benetti, A. Dabrowska, P. Plonski, A. Zalewska, A. Rappoldi, M. Szarska, P. Picchi, M. Antonello, A. Cesana, A. Piazzoli, D. Cline, Andrea Ferrari, Sandro Ventura, Hongwei Wang, Paola Sala, G. Fiorillo, J. Lagoda, J. Stepaniak, E. Calligarich, G.L. Raselli, D. Gibin, S. Otwinowski, I. Kochanek, Alessandro Menegolli, J. Kisiel, F. Varanini, M., Antonello, B., Baibussinov, P., Benetti, E., Calligarich, N., Canci, S., Centro, A., Cesana, K., Cieslik, D. B., Cline, A. G., Cocco, A., Dabrowska, D., Dequal, A., Dermenev, R., Dolfini, C., Farnese, A., Fava, A., Ferrari, Fiorillo, Giuliana, D., Gibin, S., Gninenko, A., Guglielmi, M., Haranczyk, J., Holeczek, A., Ivashkin, J., Kisiel, I., Kochanek, J., Lagoda, S., Mania, A., Menegolli, G., Meng, C., Montanari, S., Otwinowski, A., Piazzoli, P., Picchi, F., Pietropaolo, P., Plonski, A., Rappoldi, G. L., Raselli, M., Rossella, C., Rubbia, P., Sala, A., Scaramelli, E., Segreto, F., Sergiampietri, D., Stefan, J., Stepaniak, R., Sulej, M., Szarska, M., Terrani, F., Varanini, S., Ventura, C., Vignoli, H., Wang, X., Yang, A., Zalewska, and K., Zaremba

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Liquid argon, Time projection chambers, Data processing, Track reconstruction, Article Subject, Physics::Instrumentation and Detectors, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, FOS: Physical sciences, Bioengineering, Mathematical Sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Optics, DESIGN, Detectors and Experimental Techniques, Image resolution, physics.ins-det, Event reconstruction, Physics, ICARUS, Time projection chamber, business.industry, hep-ex, Track (disk drive), Detector, Reconstruction algorithm, ICARUS T600 detector, Instrumentation and Detectors (physics.ins-det), Sample (graphics), lcsh:QC1-999, Physical Sciences, TPC, business, Liquid Argon Time Projection Chamber, lcsh:Physics
Abstract

Liquid Argon Time Projection Chamber (LAr TPC) detectors offer charged particle imaging capability with remarkable spatial resolution. Precise event reconstruction procedures are critical in order to fully exploit the potential of this technology. In this paper we present a new, general approach of three-dimensional reconstruction for the LAr TPC with a practical application to track reconstruction. The efficiency of the method is evaluated on a sample of simulated tracks. We present also the application of the method to the analysis of real data tracks collected during the ICARUS T600 detector operation with the CNGS neutrino beam., Comment: Submitted to Advances in High Energy Physics

53. ICARUS at FNAL

Author

Maurizio Bonesini, C. M. Sutera, G. Mannocchi, B. Baibussinov, P. Picchi, Paola Sala, M. Haranczyk, J. Lagoda, F. Boffelli, C. Rubbia, R. Sulej, J. Holeczek, A. G. Cocco, X. Yang, E. Segreto, A. Curioni, R. Dolfini, I. Kochanek, E. Calligarich, D. Gibin, Andrea Zani, G. Meng, F. Noto, K. Zaremba, A. Guglielmi, C. Vignoli, V. A. Matveev, Mikhail Kirsanov, R. G. Van de Water, M. Rossella, Halina Bilokon, Christian Farnese, David B. Cline, K. Cieslik, A. Dermenev, P. Plonski, F. Varanini, Hui Wang, V. Bellini, A. Falcone, Alessandro Menegolli, M. Torti, S. Mania, Jan Kisiel, F. Pietropaolo, C. Montanari, T. J. Palczewski, G. B. Mills, S. Otwinowski, Alexander Kurepin, J. Stepaniak, F. Mammoliti, A. Ivashkin, D. Tlisov, G.L. Raselli, A. Scaramelli, Angela Fava, S. Centro, M. Antonello, Renato Potenza, A. Ferrari, D. Stefan, Sergei Gninenko, F.F. Guber, Sandro Ventura, and A. Rappoldi

Subjects
ICARUS, Physics, Large Hadron Collider, Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Neutrino beam, NuMI, Nuclear physics, High Energy Physics - Phenomenology, Upgrade, High Energy Physics - Phenomenology (hep-ph), Fermilab, Neutrino, Detectors and Experimental Techniques
Abstract

The INFN and the ICARUS collaboration originally developed the technology of the LAr-TPC. Located the underground LNGS Hall-B, the ICARUS T600 detector has been performed over three years with remarkable detection efficiency featuring a smooth operation, high live time, and high reliability. About 3000 CNGS neutrino events have been collected and are being actively analyzed. ICARUS will now be moved to CERN for an extensive R&D program. The T600 detector will be overhauled and complemented with a similar T150 detector. These improvements are performed in collaboration with the LBNE experiment, of which several INFN Institutions are now members. As a novelty, a SC magnetic field of about 1 T will be introduced. During 2016 it is proposed to move the experiment to FNAL where short base line neutrino beams are available, complementing the approved MicroBooNe experiment which will start operation in 2014. The ICARUS detectors at FNAL will be an important addition since, in absence of anomalies, the signals of several detectors at different distances from the target should be a copy of each other for all experimental signatures. Due to the reduced mass, in MicroBooNE the anti-neutrino signal is too weak for a sensitive comparison. Hence, a definitive clarification of the LSND anomaly requires the exploration of the anti-neutrino signal provided by the much larger T600. The magnetic field will allow separating the anti-neutrino signal from the neutrino-induced background. It is proposed to expose the T600 at the Booster NuBeam at ~700 m from target; the T150 will be located at ~150 m. The T600 will also receive >10^4 nu_e events/year from the off-axis NUMI beam peaked around 1 GeV and exploitable to prepare for the LBNE experiment. The ICARUS teams are also interested in extending the participation to other short baseline neutrino activities collaborating with existing FNAL groups., Experiment Proposal; 54 pages, 33 figures

54. Experimental observation of an extremely high electron lifetime with the ICARUS-T600 LAr-TPC

Author

Antonello, M., Baibussinov, B., Benetti, P., Boffelli, F., Bubak, Arkadiusz, Calligarich, E., Centro, S., Cesana, A., Cieślik, K., Cline, D. B., Cocco, A. G., Dabrowska, A., Dequal, D., Dermenev, A., Dolfini, R., Falcone, A., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Gibin, D., Gninenko, S., Guglielmi, A., Haranczyk, M., Holeczek, Jacek, Kirsanov, M., Kisiel, Jan, Kochanek, Izabela, Lagoda, J., Mania, Sławomir, Menegolli, A., Meng, G., Montanari, C., Nicoletto, M., Otwinowski, S., Picchi, P., Pietropaolo, F., Płoński, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scaramelli, A., Segreto, E., Sergiampietri, F., Stefan, D., Sulej, R., Szarska, M., Terrani, M., Torti, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H., Yang, X., Zalewska, A., Zani, A., Zaremba, K., M., Antonello, B., Baibussinov, P., Benetti, F., Boffelli, A., Bubak, E., Calligarich, S., Centro, A., Cesana, K., Cieślik, D., Cline, A., Cocco, A., Dabrowska, A., Dermenev, R., Dolfini, A., Falcone, C., Farnese, A., Fava, A., Ferrari, Fiorillo, Giuliana, D., Gibin, S., Gninenko, A., Guglielmi, M., Haranczyk, J., Holeczek, M., Kirsanov, J., Kisiel, I., Kochanek, J., Lagoda, S., Mania, A., Menegolli, G., Meng, C., Montanari, S., Otwinowski, P., Picchi, F., Pietropaolo, P., Plonski, A., Rappoldi, G. L., Raselli, M., Rossella, C., Rubbia, P. R., Sala, A., Scaramelli, E., Segreto, F., Sergiampietri, D., Stefan, R., Sulej, M., Szarska, M., Terrani, M., Torti, F., Varanini, S., Ventura, C., Vignoli, H., Wang, X., Yang, A., Zalewska, A., Zani, K., Zaremba, Antonello, M, Baibussinov, B, Benetti, P, Boffelli, F, Bubak, A, Calligarich, E, Centro, S, Cesana, A, Cieslik, K, Cline, D, Cocco, A, Dabrowska, A, Dermenev, A, Dolfini, R, Falcone, A, Farnese, C, Fava, A, Ferrari, A, Fiorillo, G, Gibin, D, Gninenko, S, Guglielmi, A, Haranczyk, M, Holeczek, J, Kirsanov, M, Kisiel, J, Kochanek, I, Lagoda, J, Mania, S, Menegolli, A, Meng, G, Montanari, C, Otwinowski, S, Picchi, P, Pietropaolo, F, Plonski, P, Rappoldi, A, Raselli, G, Rossella, M, Rubbia, C, Sala, P, Scaramelli, A, Segreto, E, Sergiampietri, F, Stefan, D, Sulej, R, Szarska, M, Terrani, M, Torti, M, Varanini, F, Ventura, S, Vignoli, C, Wang, H, Yang, X, Zalewska, A, Zani, A, and Zaremba, K

Subjects
ICARUS, Physics - Instrumentation and Detectors, Time projection chamber, Argon, Materials science, Detector, Cryogenic detector, chemistry.chemical_element, FOS: Physical sciences, Electron, Instrumentation and Detectors (physics.ins-det), Particle detector, Neutrino detector, Nuclear physics, chemistry, Ionization, cryogenic detectors, time projection chambers, Detectors and Experimental Techniques, Instrumentation, Mathematical Physics, charge transport and multiplication in liquid media, neutrino detectors
Abstract

The ICARUS T600 detector, the largest liquid Argon Time Projection Chamber (LAr-TPC) realized after many years of RD activities, was installed and successfully operated for 3 years at the INFN Gran Sasso underground Laboratory. One of the most important issues was the need of an extremely low residual electronegative impurity content in the liquid Argon, in order to transport the free electrons created by the ionizing particles with a very small attenuation along the drift path. The solutions adopted for the Argon re-circulation and purification systems have permitted to reach impressive results in terms of Argon purity and a free electron lifetime exceeding 15 ms, corresponding to about 20 parts per trillion of equivalent O2 contamination, a milestone for any future project involving LAr-TPC's and the development of higher detector mass scales., Comment: to be submitted to JINST, LaTeX version

Published
2014

55. Precision measurement of the neutrino velocity with the ICARUS detector in the CNGS beam

Author

Antonello, M., Baibussinov, B., Benetti, P., Boffelli, F., Calligarich, E., Canci, N., Centro, S., Cesana, A., Cieslik, K., Cline, D. B., Cocco, A. G., Dabrowska, A., Dequal, D., Dermenev, A., Dolfini, R., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Gibin, D., Gninenko, S., Guglielmi, A., Haranczyk, M., Holeczek, J., Ivashkin, A., Kisiel, J., Kochanek, I., Lagoda, J., Mania, S., Menegolli, A., Meng, G., Montanari, C., Otwinowski, S., Piazzoli, A., Picchi, P., Pietropaolo, F., Plonski, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scantamburlo, E., Scaramelli, A., Segreto, E., Sergiampietri, F., Stefan, D., Stepaniak, J., Sulej, R., Szarska, M., Terrani, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H. G., Yang, X., Zalewska, A., Zani, A., Zaremba, K., Alvarez Sanchez, P., Biagi, L., Barzaghi, R., Betti, B., Bernier, L.-G., Cerretto, G., De Gaetani, C., Esteban, H., Feldmann, T., Gonzalez Cobas, J. D., Passoni, D., Pettiti, V., Pinto, L., Serrano, J., Spinnato, P., Visconti, M. G., Wlostowski, T., M., Antonello, B., Baibussinov, P., Benetti, F., Boffelli, E., Calligarich, N., Canci, S., Centro, A., Cesana, K., Cieslik, D. B., Cline, A. G., Cocco, A., Dabrowska, D., Dequal, A., Dermenev, R., Dolfini, C., Farnese, A., Fava, A., Ferrari, Fiorillo, Giuliana, D., Gibin, S., Gninenko, A., Guglielmi, M., Haranczyk, J., Holeczek, A., Ivashkin, J., Kisiel, I., Kochanek, J., Lagoda, S., Mania, A., Menegolli, G., Meng, C., Montanari, S., Otwinowski, A., Piazzoli, P., Picchi, F., Pietropaolo, P., Plonski, A., Rappoldi, G. L., Raselli, M., Rossella, C., Rubbia, P., Sala, E., Scantamburlo, A., Scaramelli, E., Segreto, F., Sergiampietri, D., Stefan, J., Stepaniak, R., Sulej, M., Szarska, M., Terrani, F., Varanini, S., Ventura, C., Vignoli, H. G., Wang, X., Yang, A., Zalewska, A., Zani, K., Zaremba, P., Alvarez Sanchez, L., Biagi, R., Barzaghi, B., Betti, L. G., Bernier, G., Cerretto, C., Gaetani, H., Esteban, T., Feldmann, J. D., Gonzalez Coba, D., Passoni, V., Pettiti, L., Pinto, J., Serrano, P., Spinnato, M. G., Visconti, and T., Wlostowski

Subjects
ICARUS, Physics, Neutrino Detectors and Telescopes, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Proton, Physics::Instrumentation and Detectors, Detector, FOS: Physical sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Time of flight, Bunches, Neutrino Detectors, Physics::Accelerator Physics, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Particle Physics - Experiment, Beam (structure), Telescopes
Abstract

During May 2012, the CERN-CNGS neutrino beam has been operated for two weeks for a total of 1.8 10^17 pot in bunched mode, with a 3 ns narrow width proton beam bunches, separated by 100 ns. This tightly bunched beam structure allows a very accurate time of flight measurement of neutrinos from CERN to LNGS on an event-by-event basis. Both the ICARUS-T600 PMT-DAQ and the CERN-LNGS timing synchronization have been substantially improved for this campaign, taking ad-vantage of additional independent GPS receivers, both at CERN and LNGS as well as of the deployment of the "White Rabbit" protocol both at CERN and LNGS. The ICARUS-T600 detector has collected 25 beam-associated events; the corresponding time of flight has been accurately evaluated, using all different time synchronization paths. The measured neutrino time of flight is compatible with the arrival of all events with speed equivalent to the one of light: the difference between the expected value based on the speed of light and the measured value is tof_c - tof_nu = (0.10 \pm 0.67stat. \pm 2.39syst.) ns. This result is in agreement with the value previously reported by the ICARUS collaboration, tof_c - tof_nu = (0.3 \pm 4.9stat. \pm 9.0syst.) ns, but with improved statistical and systematic errors., Comment: 21 pages, 13 figures, 1 table

Published
2012

56. Measurement of the neutrino velocity with the ICARUS detector at the CNGS beam

Author

Antonello, M., Aprili, P., Baibussinov, B., Ceolin, M. Baldo, Benetti, P., Calligarich, E., Canci, N., Carbonara, F., Centro, S., Cesana, A., Cieslik, K., Cline, D. B., Cocco, A. G., Dabrowska, A., Dequal, D., Dermenev, A., Dolfini, R., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Gibin, D., Berzolari, A. Gigli, Gninenko, S., Guglielmi, A., Haranczyk, M., Holeczek, J., Ivashkin, A., Kisiel, J., Kochanek, I., Lagoda, J., Mania, S., Mannocchi, G., Menegolli, A., Meng, G., Montanari, C., Otwinowski, S., Periale, L., Piazzoli, A., Picchi, P., Pietropaolo, F., Plonski, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scantamburlo, E., Scaramelli, A., Segreto, E., Sergiampietri, F., Stefan, D., Stepaniak, J., Sulej, R., Szarska, M., Terrani, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H., Yang, X., Zalewska, A., Zaremba, K., Sanchez, P. Alvarez, Serrano, J., M., Antonello, P., Aprili, B., Baiboussinov, M. B., Ceolin, P., Benetti, E., Calligarich, N., Canci, S., Centro, A., Cesana, K., Cieslik, D. B., Cline, A. G., Cocco, A., Dabrowska, D., Dequal, A., Dermenev, R., Dolfini, C., Farnese, A., Fava, A., Ferrari, Fiorillo, Giuliana, D., Gibin, A. G., Berzolari, S., Gninenko, A., Guglielmi, M., Haranczyk, J., Holeczek, A., Ivashkin, J., Kisiel, I., Kochanek, J., Lagoda, S., Mania, G., Mannocchi, A., Menegolli, G., Meng, C., Montanari, S., Otwinowski, L., Periale, A., Piazzoli, P., Picchi, F., Pietropaolo, P., Plonski, A., Rappoldi, G. L., Raselli, M., Rossella, C., Rubbia, P., Sala, E., Scantamburlo, A., Scaramelli, E., Segreto, F., Sergiampietri, D., Stefan, J., Stepaniak, R., Sulej, M., Szarska, M., Terrani, F., Varanini, S., Ventura, C., Vignoli, H. G., Wang, A., Zalewska, K., Zaremba, P. A., Sanchez, and J., Serrano

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, argon time, neutrino beam, neutrino velocity, neutrino time of flight, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), argon, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, Liquefied gases
Abstract

The CERN-SPS accelerator has been briefly operated in a new, lower intensity neutrino mode with ~10^12 p.o.t. /pulse and with a beam structure made of four LHC-like extractions, each with a narrow width of 3 ns, separated by 524 ns. This very tightly bunched beam structure represents a substantial progress with respect to the ordinary operation of the CNGS beam, since it allows a very accurate time-of-flight measurement of neutrinos from CERN to LNGS on an event-to-event basis. The ICARUS T600 detector has collected 7 beam-associated events, consistent with the CNGS delivered neutrino flux of 2.2 10^16 p.o.t. and in agreement with the well known characteristics of neutrino events in the LAr-TPC. The time of flight difference between the speed of light and the arriving neutrino LAr-TPC events has been analysed. The result is compatible with the simultaneous arrival of all events with equal speed, the one of light. This is in a striking difference with the reported result of OPERA that claimed that high energy neutrinos from CERN should arrive at LNGS about 60 ns earlier than expected from luminal speed., Comment: 13 pages, 1 table, 3 figures

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57. Search for Dark Matter Particle Interactions with Electron Final States with DarkSide-50.

Author

Agnes P, Albuquerque IFM, Alexander T, Alton AK, Ave M, Back HO, Batignani G, Biery K, Bocci V, Bonivento WM, Bottino B, Bussino S, Cadeddu M, Cadoni M, Calaprice F, Caminata A, Campos MD, Canci N, Caravati M, Cargioli N, Cariello M, Carlini M, Cataudella V, Cavalcante P, Cavuoti S, Chashin S, Chepurnov A, Cicalò C, Covone G, D'Angelo D, Davini S, De Candia A, De Cecco S, De Filippis G, De Rosa G, Derbin AV, Devoto A, D'Incecco M, Dionisi C, Dordei F, Downing M, D'Urso D, Fiorillo G, Franco D, Gabriele F, Galbiati C, Ghiano C, Giganti C, Giovanetti GK, Goretti AM, Grilli di Cortona G, Grobov A, Gromov M, Guan M, Gulino M, Hackett BR, Herner K, Hessel T, Hosseini B, Hubaut F, Hungerford EV, Ianni A, Ippolito V, Keeter K, Kendziora CL, Kimura M, Kochanek I, Korablev D, Korga G, Kubankin A, Kuss M, La Commara M, Lai M, Li X, Lissia M, Longo G, Lychagina O, Machulin IN, Mapelli LP, Mari SM, Maricic J, Messina A, Milincic R, Monroe J, Morrocchi M, Mougeot X, Muratova VN, Musico P, Nozdrina AO, Oleinik A, Ortica F, Pagani L, Pallavicini M, Pandola L, Pantic E, Paoloni E, Pelczar K, Pelliccia N, Piacentini S, Pocar A, Poehlmann DM, Pordes S, Poudel SS, Pralavorio P, Price DD, Ragusa F, Razeti M, Razeto A, Renshaw AL, Rescigno M, Rode J, Romani A, Sablone D, Samoylov O, Sands W, Sanfilippo S, Sandford E, Savarese C, Schlitzer B, Semenov DA, Shchagin A, Sheshukov A, Skorokhvatov MD, Smirnov O, Sotnikov A, Stracka S, Suvorov Y, Tartaglia R, Testera G, Tonazzo A, Unzhakov EV, Vishneva A, Vogelaar RB, Wada M, Wang H, Wang Y, Westerdale S, Wojcik MM, Xiao X, Yang C, and Zuzel G

Abstract

We present a search for dark matter particles with sub-GeV/c^{2} masses whose interactions have final state electrons using the DarkSide-50 experiment's (12 306±184)  kg d low-radioactivity liquid argon exposure. By analyzing the ionization signals, we exclude new parameter space for the dark matter-electron cross section σ[over ¯]_{e}, the axioelectric coupling constant g_{Ae}, and the dark photon kinetic mixing parameter κ. We also set the first dark matter direct-detection constraints on the mixing angle |U_{e4}|^{2} for keV/c^{2} sterile neutrinos.

Published
2023
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58. Search for Dark-Matter-Nucleon Interactions via Migdal Effect with DarkSide-50.

Author

Agnes P, Albuquerque IFM, Alexander T, Alton AK, Ave M, Back HO, Batignani G, Biery K, Bocci V, Bonivento WM, Bottino B, Bussino S, Cadeddu M, Cadoni M, Calaprice F, Caminata A, Campos MD, Canci N, Caravati M, Cargioli N, Cariello M, Carlini M, Cataudella V, Cavalcante P, Cavuoti S, Chashin S, Chepurnov A, Cicalò C, Covone G, D'Angelo D, Davini S, De Candia A, De Cecco S, De Filippis G, De Rosa G, Derbin AV, Devoto A, D'Incecco M, Dionisi C, Dordei F, Downing M, D'Urso D, Fairbairn M, Fiorillo G, Franco D, Gabriele F, Galbiati C, Ghiano C, Giganti C, Giovanetti GK, Goretti AM, Grilli di Cortona G, Grobov A, Gromov M, Guan M, Gulino M, Hackett BR, Herner K, Hessel T, Hosseini B, Hubaut F, Hungerford EV, Ianni A, Ippolito V, Keeter K, Kendziora CL, Kimura M, Kochanek I, Korablev D, Korga G, Kubankin A, Kuss M, La Commara M, Lai M, Li X, Lissia M, Longo G, Lychagina O, Machulin IN, Mapelli LP, Mari SM, Maricic J, Messina A, Milincic R, Monroe J, Morrocchi M, Mougeot X, Muratova VN, Musico P, Nozdrina AO, Oleinik A, Ortica F, Pagani L, Pallavicini M, Pandola L, Pantic E, Paoloni E, Pelczar K, Pelliccia N, Piacentini S, Pocar A, Poehlmann DM, Pordes S, Poudel SS, Pralavorio P, Price DD, Ragusa F, Razeti M, Razeto A, Renshaw AL, Rescigno M, Rode J, Romani A, Sablone D, Samoylov O, Sandford E, Sands W, Sanfilippo S, Savarese C, Schlitzer B, Semenov DA, Shchagin A, Sheshukov A, Skorokhvatov MD, Smirnov O, Sotnikov A, Stracka S, Suvorov Y, Tartaglia R, Testera G, Tonazzo A, Unzhakov EV, Vishneva A, Vogelaar RB, Wada M, Wang H, Wang Y, Westerdale S, Wojcik MM, Xiao X, Yang C, and Zuzel G

Abstract

Dark matter elastic scattering off nuclei can result in the excitation and ionization of the recoiling atom through the so-called Migdal effect. The energy deposition from the ionization electron adds to the energy deposited by the recoiling nuclear system and allows for the detection of interactions of sub-GeV/c^{2} mass dark matter. We present new constraints for sub-GeV/c^{2} dark matter using the dual-phase liquid argon time projection chamber of the DarkSide-50 experiment with an exposure of (12 306±184)  kg d. The analysis is based on the ionization signal alone and significantly enhances the sensitivity of DarkSide-50, enabling sensitivity to dark matter with masses down to 40  MeV/c^{2}. Furthermore, it sets the most stringent upper limit on the spin independent dark matter nucleon cross section for masses below 3.6  GeV/c^{2}.

Published
2023
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59. First Direct Detection Constraints on Planck-Scale Mass Dark Matter with Multiple-Scatter Signatures Using the DEAP-3600 Detector.

Author

Adhikari P, Ajaj R, Alpízar-Venegas M, Auty DJ, Benmansour H, Bina CE, Bonivento W, Boulay MG, Cadeddu M, Cai B, Cárdenas-Montes M, Cavuoti S, Chen Y, Cleveland BT, Corning JM, Daugherty S, DelGobbo P, Di Stefano P, Doria L, Dunford M, Ellingwood E, Erlandson A, Farahani SS, Fatemighomi N, Fiorillo G, Gallacher D, García Abia P, Garg S, Giampa P, Goeldi D, Gorel P, Graham K, Grobov A, Hallin AL, Hamstra M, Hugues T, Ilyasov A, Joy A, Jigmeddorj B, Jillings CJ, Kamaev O, Kaur G, Kemp A, Kochanek I, Kuźniak M, Lai M, Langrock S, Lehnert B, Leonhardt A, Levashko N, Li X, Lissia M, Litvinov O, Lock J, Longo G, Machulin I, McDonald AB, McElroy T, McLaughlin JB, Mielnichuk C, Mirasola L, Monroe J, Oliviéro G, Pal S, Peeters SJM, Perry M, Pesudo V, Picciau E, Piro MC, Pollmann TR, Raj N, Rand ET, Rethmeier C, Retière F, Rodríguez-García I, Roszkowski L, Ruhland JB, Sanchez García E, Sánchez-Pastor T, Santorelli R, Seth S, Sinclair D, Skensved P, Smith B, Smith NJT, Sonley T, Stainforth R, Stringer M, Sur B, Vázquez-Jáuregui E, Viel S, Walding J, Waqar M, Ward M, Westerdale S, Willis J, and Zuñiga-Reyes A

Abstract

Dark matter with Planck-scale mass (≃10^{19}  GeV/c^{2}) arises in well-motivated theories and could be produced by several cosmological mechanisms. A search for multiscatter signals from supermassive dark matter was performed with a blind analysis of data collected over a 813 d live time with DEAP-3600, a 3.3 t single-phase liquid argon-based detector at SNOLAB. No candidate signals were observed, leading to the first direct detection constraints on Planck-scale mass dark matter. Leading limits constrain dark matter masses between 8.3×10^{6} and 1.2×10^{19}  GeV/c^{2}, and ^{40}Ar-scattering cross sections between 1.0×10^{-23} and 2.4×10^{-18}  cm^{2}. These results are interpreted as constraints on composite dark matter models with two different nucleon-to-nuclear cross section scalings.

Published
2022
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60. The novel Mechanical Ventilator Milano for the COVID-19 pandemic.

Author

Abba A, Accorsi C, Agnes P, Alessi E, Amaudruz P, Annovi A, Desages FA, Back S, Badia C, Bagger J, Basile V, Batignani G, Bayo A, Bell B, Beschi M, Biagini D, Bianchi G, Bicelli S, Bishop D, Boccali T, Bombarda A, Bonfanti S, Bonivento WM, Bouchard M, Breviario M, Brice S, Brown R, Calvo-Mozota JM, Camozzi L, Camozzi M, Capra A, Caravati M, Carlini M, Ceccanti A, Celano B, Cela Ruiz JM, Charette C, Cogliati G, Constable M, Crippa C, Croci G, Cudmore S, Dahl CE, Dal Molin A, Daley M, Di Guardo C, D'Avenio G, Davignon O, Del Tutto M, De Ruiter J, Devoto A, Diaz Gomez Maqueo P, Di Francesco F, Dossi M, Druszkiewicz E, Duma C, Elliott E, Farina D, Fernandes C, Ferroni F, Finocchiaro G, Fiorillo G, Ford R, Foti G, Fournier RD, Franco D, Fricbergs C, Gabriele F, Galbiati C, Garcia Abia P, Gargantini A, Giacomelli L, Giacomini F, Giacomini F, Giarratana LS, Gillespie S, Giorgi D, Girma T, Gobui R, Goeldi D, Golf F, Gorel P, Gorini G, Gramellini E, Grosso G, Guescini F, Guetre E, Hackman G, Hadden T, Hawkins W, Hayashi K, Heavey A, Hersak G, Hessey N, Hockin G, Hudson K, Ianni A, Ienzi C, Ippolito V, James CC, Jillings C, Kendziora C, Khan S, Kim E, King M, King S, Kittmer A, Kochanek I, Kowalkowski J, Krücken R, Kushoro M, Kuula S, Laclaustra M, Leblond G, Lee L, Lennarz A, Leyton M, Li X, Liimatainen P, Lim C, Lindner T, Lomonaco T, Lu P, Lubna R, Lukhanin GA, Luzón G, MacDonald M, Magni G, Maharaj R, Manni S, Mapelli C, Margetak P, Martin L, Martin S, Martínez M, Massacret N, McClurg P, McDonald AB, Meazzi E, Migalla R, Mohayai T, Tosatti LM, Monzani G, Moretti C, Morrison B, Mountaniol M, Muraro A, Napoli P, Nati F, Natzke CR, Noble AJ, Norrick A, Olchanski K, Ortiz de Solorzano A, Padula F, Pallavicini M, Palumbo I, Panontin E, Papini N, Parmeggiano L, Parmeggiano S, Patel K, Patel A, Paterno M, Pellegrino C, Pelliccione P, Pesudo V, Pocar A, Pope A, Pordes S, Prelz F, Putignano O, Raaf JL, Ratti C, Razeti M, Razeto A, Reed D, Refsgaard J, Reilly T, Renshaw A, Retriere F, Riccobene E, Rigamonti D, Rizzi A, Rode J, Romualdez J, Russel L, Sablone D, Sala S, Salomoni D, Salvo P, Sandoval A, Sansoucy E, Santorelli R, Savarese C, Scapparone E, Schaubel T, Scorza S, Settimo M, Shaw B, Shawyer S, Sher A, Shi A, Skensved P, Slutsky A, Smith B, Smith NJT, Stenzler A, Straubel C, Stringari P, Suchenek M, Sur B, Tacchino S, Takeuchi L, Tardocchi M, Tartaglia R, Thomas E, Trask D, Tseng J, Tseng L, VanPagee L, Vedia V, Velghe B, Viel S, Visioli A, Viviani L, Vonica D, Wada M, Walter D, Wang H, Wang MHLS, Westerdale S, Wood D, Yates D, Yue S, and Zambrano V

Abstract

This paper presents the Mechanical Ventilator Milano (MVM), a novel intensive therapy mechanical ventilator designed for rapid, large-scale, low-cost production for the COVID-19 pandemic. Free of moving mechanical parts and requiring only a source of compressed oxygen and medical air to operate, the MVM is designed to support the long-term invasive ventilation often required for COVID-19 patients and operates in pressure-regulated ventilation modes, which minimize the risk of furthering lung trauma. The MVM was extensively tested against ISO standards in the laboratory using a breathing simulator, with good agreement between input and measured breathing parameters and performing correctly in response to fault conditions and stability tests. The MVM has obtained Emergency Use Authorization by U.S. Food and Drug Administration (FDA) for use in healthcare settings during the COVID-19 pandemic and Health Canada Medical Device Authorization for Importation or Sale, under Interim Order for Use in Relation to COVID-19. Following these certifications, mass production is ongoing and distribution is under way in several countries. The MVM was designed, tested, prepared for certification, and mass produced in the space of a few months by a unique collaboration of respiratory healthcare professionals and experimental physicists, working with industrial partners, and is an excellent ventilator candidate for this pandemic anywhere in the world., (© 2021 Author(s).)

Published
2021
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61. Pulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data.

Author

Adhikari P, Ajaj R, Alpízar-Venegas M, Amaudruz PA, Auty DJ, Batygov M, Beltran B, Benmansour H, Bina CE, Bonatt J, Bonivento W, Boulay MG, Broerman B, Bueno JF, Burghardt PM, Butcher A, Cadeddu M, Cai B, Cárdenas-Montes M, Cavuoti S, Chen M, Chen Y, Cleveland BT, Corning JM, Cranshaw D, Daugherty S, DelGobbo P, Dering K, DiGioseffo J, Di Stefano P, Doria L, Duncan FA, Dunford M, Ellingwood E, Erlandson A, Farahani SS, Fatemighomi N, Fiorillo G, Florian S, Flower T, Ford RJ, Gagnon R, Gallacher D, García Abia P, Garg S, Giampa P, Goeldi D, Golovko V, Gorel P, Graham K, Grant DR, Grobov A, Hallin AL, Hamstra M, Harvey PJ, Hearns C, Hugues T, Ilyasov A, Joy A, Jigmeddorj B, Jillings CJ, Kamaev O, Kaur G, Kemp A, Kochanek I, Kuźniak M, Lai M, Langrock S, Lehnert B, Leonhardt A, Levashko N, Li X, Lidgard J, Lindner T, Lissia M, Lock J, Longo G, Machulin I, McDonald AB, McElroy T, McGinn T, McLaughlin JB, Mehdiyev R, Mielnichuk C, Monroe J, Nadeau P, Nantais C, Ng C, Noble AJ, O'Dwyer E, Oliviéro G, Ouellet C, Pal S, Pasuthip P, Peeters SJM, Perry M, Pesudo V, Picciau E, Piro MC, Pollmann TR, Rand ET, Rethmeier C, Retière F, Rodríguez-García I, Roszkowski L, Ruhland JB, Sánchez-García E, Santorelli R, Sinclair D, Skensved P, Smith B, Smith NJT, Sonley T, Soukup J, Stainforth R, Stone C, Strickland V, Stringer M, Sur B, Tang J, Vázquez-Jáuregui E, Viel S, Walding J, Waqar M, Ward M, Westerdale S, Willis J, and Zuñiga-Reyes A

Abstract

The DEAP-3600 detector searches for the scintillation signal from dark matter particles scattering on a 3.3 tonne liquid argon target. The largest background comes from 39 Ar beta decays and is suppressed using pulse-shape discrimination (PSD). We use two types of PSD estimator: the prompt-fraction, which considers the fraction of the scintillation signal in a narrow and a wide time window around the event peak, and the log-likelihood-ratio, which compares the observed photon arrival times to a signal and a background model. We furthermore use two algorithms to determine the number of photons detected at a given time: (1) simply dividing the charge of each PMT pulse by the mean single-photoelectron charge, and (2) a likelihood analysis that considers the probability to detect a certain number of photons at a given time, based on a model for the scintillation pulse shape and for afterpulsing in the light detectors. The prompt-fraction performs approximately as well as the log-likelihood-ratio PSD algorithm if the photon detection times are not biased by detector effects. We explain this result using a model for the information carried by scintillation photons as a function of the time when they are detected., (© The Author(s) 2021.)

Published
2021
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62. The baryon density of the Universe from an improved rate of deuterium burning.

Author

Mossa V, Stöckel K, Cavanna F, Ferraro F, Aliotta M, Barile F, Bemmerer D, Best A, Boeltzig A, Broggini C, Bruno CG, Caciolli A, Chillery T, Ciani GF, Corvisiero P, Csedreki L, Davinson T, Depalo R, Di Leva A, Elekes Z, Fiore EM, Formicola A, Fülöp Z, Gervino G, Guglielmetti A, Gustavino C, Gyürky G, Imbriani G, Junker M, Kievsky A, Kochanek I, Lugaro M, Marcucci LE, Mangano G, Marigo P, Masha E, Menegazzo R, Pantaleo FR, Paticchio V, Perrino R, Piatti D, Pisanti O, Prati P, Schiavulli L, Straniero O, Szücs T, Takács MP, Trezzi D, Viviani M, and Zavatarelli S

Abstract

Light elements were produced in the first few minutes of the Universe through a sequence of nuclear reactions known as Big Bang nucleosynthesis (BBN) 1,2 . Among the light elements produced during BBN 1,2 , deuterium is an excellent indicator of cosmological parameters because its abundance is highly sensitive to the primordial baryon density and also depends on the number of neutrino species permeating the early Universe. Although astronomical observations of primordial deuterium abundance have reached percent accuracy 3 , theoretical predictions 4-6 based on BBN are hampered by large uncertainties on the cross-section of the deuterium burning D(p,γ) 3 He reaction. Here we show that our improved cross-sections of this reaction lead to BBN estimates of the baryon density at the 1.6 percent level, in excellent agreement with a recent analysis of the cosmic microwave background 7 . Improved cross-section data were obtained by exploiting the negligible cosmic-ray background deep underground at the Laboratory for Underground Nuclear Astrophysics (LUNA) of the Laboratori Nazionali del Gran Sasso (Italy) 8,9 . We bombarded a high-purity deuterium gas target 10 with an intense proton beam from the LUNA 400-kilovolt accelerator 11 and detected the γ-rays from the nuclear reaction under study with a high-purity germanium detector. Our experimental results settle the most uncertain nuclear physics input to BBN calculations and substantially improve the reliability of using primordial abundances to probe the physics of the early Universe.

Published
2020
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63. Direct Capture Cross Section and the E_{p}=71 and 105 keV Resonances in the ^{22}Ne(p,γ)^{23}Na Reaction.

Author

Ferraro F, Takács MP, Piatti D, Cavanna F, Depalo R, Aliotta M, Bemmerer D, Best A, Boeltzig A, Broggini C, Bruno CG, Caciolli A, Chillery T, Ciani GF, Corvisiero P, Davinson T, D'Erasmo G, Di Leva A, Elekes Z, Fiore EM, Formicola A, Fülöp Z, Gervino G, Guglielmetti A, Gustavino C, Gyürky G, Imbriani G, Junker M, Karakas A, Kochanek I, Lugaro M, Marigo P, Menegazzo R, Mossa V, Pantaleo FR, Paticchio V, Perrino R, Prati P, Schiavulli L, Stöckel K, Straniero O, Szücs T, Trezzi D, and Zavatarelli S

Abstract

The ^{22}Ne(p,γ)^{23}Na reaction, part of the neon-sodium cycle of hydrogen burning, may explain the observed anticorrelation between sodium and oxygen abundances in globular cluster stars. Its rate is controlled by a number of low-energy resonances and a slowly varying nonresonant component. Three new resonances at E_{p}=156.2, 189.5, and 259.7 keV have recently been observed and confirmed. However, significant uncertainty on the reaction rate remains due to the nonresonant process and to two suggested resonances at E_{p}=71 and 105 keV. Here, new ^{22}Ne(p,γ)^{23}Na data with high statistics and low background are reported. Stringent upper limits of 6×10^{-11} and 7×10^{-11}  eV (90% confidence level), respectively, are placed on the two suggested resonances. In addition, the off-resonant S factor has been measured at unprecedented low energy, constraining the contributions from a subthreshold resonance and the direct capture process. As a result, at a temperature of 0.1 GK the error bar of the ^{22}Ne(p,γ)^{23}Na rate is now reduced by 3 orders of magnitude.

Published
2018
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64. Constraints on Sub-GeV Dark-Matter-Electron Scattering from the DarkSide-50 Experiment.

Author

Agnes P, Albuquerque IFM, Alexander T, Alton AK, Araujo GR, Asner DM, Ave M, Back HO, Baldin B, Batignani G, Biery K, Bocci V, Bonfini G, Bonivento W, Bottino B, Budano F, Bussino S, Cadeddu M, Cadoni M, Calaprice F, Caminata A, Canci N, Candela A, Caravati M, Cariello M, Carlini M, Carpinelli M, Catalanotti S, Cataudella V, Cavalcante P, Cavuoti S, Cereseto R, Chepurnov A, Cicalò C, Cifarelli L, Cocco AG, Covone G, D'Angelo D, D'Incecco M, D'Urso D, Davini S, De Candia A, De Cecco S, De Deo M, De Filippis G, De Rosa G, De Vincenzi M, Demontis P, Derbin AV, Devoto A, Di Eusanio F, Di Pietro G, Dionisi C, Downing M, Edkins E, Empl A, Fan A, Fiorillo G, Fomenko K, Franco D, Gabriele F, Gabrieli A, Galbiati C, Garcia Abia P, Ghiano C, Giagu S, Giganti C, Giovanetti GK, Gorchakov O, Goretti AM, Granato F, Gromov M, Guan M, Guardincerri Y, Gulino M, Hackett BR, Hassanshahi MH, Herner K, Hosseini B, Hughes D, Humble P, Hungerford EV, Ianni A, Ianni A, Ippolito V, James I, Johnson TN, Kahn Y, Keeter K, Kendziora CL, Kochanek I, Koh G, Korablev D, Korga G, Kubankin A, Kuss M, La Commara M, Lai M, Li X, Lisanti M, Lissia M, Loer B, Longo G, Ma Y, Machado AA, Machulin IN, Mandarano A, Mapelli L, Mari SM, Maricic J, Martoff CJ, Messina A, Meyers PD, Milincic R, Mishra-Sharma S, Monte A, Morrocchi M, Mount BJ, Muratova VN, Musico P, Nania R, Navrer Agasson A, Nozdrina AO, Oleinik A, Orsini M, Ortica F, Pagani L, Pallavicini M, Pandola L, Pantic E, Paoloni E, Pazzona F, Pelczar K, Pelliccia N, Pesudo V, Picciau E, Pocar A, Pordes S, Poudel SS, Pugachev DA, Qian H, Ragusa F, Razeti M, Razeto A, Reinhold B, Renshaw AL, Rescigno M, Riffard Q, Romani A, Rossi B, Rossi N, Sablone D, Samoylov O, Sands W, Sanfilippo S, Sant M, Santorelli R, Savarese C, Scapparone E, Schlitzer B, Segreto E, Semenov DA, Shchagin A, Sheshukov A, Singh PN, Skorokhvatov MD, Smirnov O, Sotnikov A, Stanford C, Stracka S, Suffritti GB, Suvorov Y, Tartaglia R, Testera G, Tonazzo A, Trinchese P, Unzhakov EV, Verducci M, Vishneva A, Vogelaar B, Wada M, Waldrop TJ, Wang H, Wang Y, Watson AW, Westerdale S, Wojcik MM, Wojcik M, Xiang X, Xiao X, Yang C, Ye Z, Zhu C, Zichichi A, and Zuzel G

Abstract

We present new constraints on sub-GeV dark-matter particles scattering off electrons based on 6780.0 kg d of data collected with the DarkSide-50 dual-phase argon time projection chamber. This analysis uses electroluminescence signals due to ionized electrons extracted from the liquid argon target. The detector has a very high trigger probability for these signals, allowing for an analysis threshold of three extracted electrons, or approximately 0.05 keVee. We calculate the expected recoil spectra for dark matter-electron scattering in argon and, under the assumption of momentum-independent scattering, improve upon existing limits from XENON10 for dark-matter particles with masses between 30 and 100  MeV/c^{2}.

Published
2018
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65. Low-Mass Dark Matter Search with the DarkSide-50 Experiment.

Author

Agnes P, Albuquerque IFM, Alexander T, Alton AK, Araujo GR, Asner DM, Ave M, Back HO, Baldin B, Batignani G, Biery K, Bocci V, Bonfini G, Bonivento W, Bottino B, Budano F, Bussino S, Cadeddu M, Cadoni M, Calaprice F, Caminata A, Canci N, Candela A, Caravati M, Cariello M, Carlini M, Carpinelli M, Catalanotti S, Cataudella V, Cavalcante P, Cavuoti S, Cereseto R, Chepurnov A, Cicalò C, Cifarelli L, Cocco AG, Covone G, D'Angelo D, D'Incecco M, D'Urso D, Davini S, De Candia A, De Cecco S, De Deo M, De Filippis G, De Rosa G, De Vincenzi M, Demontis P, Derbin AV, Devoto A, Di Eusanio F, Di Pietro G, Dionisi C, Downing M, Edkins E, Empl A, Fan A, Fiorillo G, Fomenko K, Franco D, Gabriele F, Gabrieli A, Galbiati C, Garcia Abia P, Ghiano C, Giagu S, Giganti C, Giovanetti GK, Gorchakov O, Goretti AM, Granato F, Gromov M, Guan M, Guardincerri Y, Gulino M, Hackett BR, Hassanshahi MH, Herner K, Hosseini B, Hughes D, Humble P, Hungerford EV, Ianni A, Ianni A, Ippolito V, James I, Johnson TN, Kahn Y, Keeter K, Kendziora CL, Kochanek I, Koh G, Korablev D, Korga G, Kubankin A, Kuss M, La Commara M, Lai M, Li X, Lisanti M, Lissia M, Loer B, Longo G, Ma Y, Machado AA, Machulin IN, Mandarano A, Mapelli L, Mari SM, Maricic J, Martoff CJ, Messina A, Meyers PD, Milincic R, Mishra-Sharma S, Monte A, Morrocchi M, Mount BJ, Muratova VN, Musico P, Nania R, Navrer Agasson A, Nozdrina AO, Oleinik A, Orsini M, Ortica F, Pagani L, Pallavicini M, Pandola L, Pantic E, Paoloni E, Pazzona F, Pelczar K, Pelliccia N, Pesudo V, Pocar A, Pordes S, Poudel SS, Pugachev DA, Qian H, Ragusa F, Razeti M, Razeto A, Reinhold B, Renshaw AL, Rescigno M, Riffard Q, Romani A, Rossi B, Rossi N, Sablone D, Samoylov O, Sands W, Sanfilippo S, Sant M, Santorelli R, Savarese C, Scapparone E, Schlitzer B, Segreto E, Semenov DA, Shchagin A, Sheshukov A, Singh PN, Skorokhvatov MD, Smirnov O, Sotnikov A, Stanford C, Stracka S, Suffritti GB, Suvorov Y, Tartaglia R, Testera G, Tonazzo A, Trinchese P, Unzhakov EV, Verducci M, Vishneva A, Vogelaar B, Wada M, Waldrop TJ, Wang H, Wang Y, Watson AW, Westerdale S, Wojcik MM, Wojcik M, Xiang X, Xiao X, Yang C, Ye Z, Zhu C, Zichichi A, and Zuzel G

Abstract

We present the results of a search for dark matter weakly interacting massive particles (WIMPs) in the mass range below 20  GeV/c^{2} using a target of low-radioactivity argon with a 6786.0 kg d exposure. The data were obtained using the DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso. The analysis is based on the ionization signal, for which the DarkSide-50 time projection chamber is fully efficient at 0.1  keVee. The observed rate in the detector at 0.5  keVee is about 1.5  event/keVee/kg/d and is almost entirely accounted for by known background sources. We obtain a 90% C.L. exclusion limit above 1.8  GeV/c^{2} for the spin-independent cross section of dark matter WIMPs on nucleons, extending the exclusion region for dark matter below previous limits in the range 1.8-6  GeV/c^{2}.

Published
2018
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