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Search Results: 1 - 10 of 325216 matches for " S. Parmeggiano "
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Light Yield in DarkSide-10: a Prototype Two-phase Liquid Argon TPC for Dark Matter Searches
T. Alexander,D. Alton,K. Arisaka,H. O. Back,P. Beltrame,J. Benziger,G. Bonfini,A. Brigatti,J. Brodsky,L. Cadonati,F. Calaprice,A. Candela,H. Cao,P. Cavalcante,A. Chavarria,A. Chepurnov,D. Cline,A. G. Cocco,C. Condon,D. D'Angelo,S. Davini,E. De Haas,A. Derbin,G. Di Pietro,I. Dratchnev,D. Durben,A. Empl,A. Etenko,A. Fan,G. Fiorillo,K. Fomenko,F. Gabriele,C. Galbiati,S. Gazzana,C. Ghag,C. Ghiano,A. Goretti,L. Grandi,M. Gromov,M. Guan,C. Guo,G. Guray,E. V. Hungerford,Al. Ianni,An. Ianni,A. Kayunov,K. Keeter,C. Kendziora,S. Kidner,V. Kobychev,G. Koh,D. Korablev,G. Korga,E. Shields,P. Li,B. Loer,P. Lombardi,C. Love,L. Ludhova,L. Lukyanchenko,A. Lund,K. Lung,Y. Ma,I. Machulin,J. Maricic,C. J. Martoff,Y. Meng,E. Meroni,P. D. Meyers,T. Mohayai,D. Montanari,M. Montuschi,P. Mosteiro,B. Mount,V. Muratova,A. Nelson,A. Nemtzow,N. Nurakhov,M. Orsini,F. Ortica,M. Pallavicini,E. Pantic,S. Parmeggiano,R. Parsells,N. Pelliccia,L. Perasso,F. Perfetto,L. Pinsky,A. Pocar,S. Pordes,G. Ranucci,A. Razeto,A. Romani,N. Rossi,P. Saggese,R. Saldanha,C. Salvo,W. Sands,M. Seigar,D. Semenov,M. Skorokhvatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,J. Tatarowicz,G. Testera,A. Teymourian,J. Thompson,E. Unzhakov,R. B. Vogelaar,H. Wang,S. Westerdale,M. Wojcik,A. Wright,J. Xu,C. Yang,S. Zavatarelli,M. Zehfus,W. Zhong,G. Zuzel
Physics , 2012, DOI: 10.1016/j.astropartphys.2013.08.004
Abstract: As part of the DarkSide program of direct dark matter searches using liquid argon TPCs, a prototype detector with an active volume containing 10 kg of liquid argon, DarkSide-10, was built and operated underground in the Gran Sasso National Laboratory in Italy. A critically important parameter for such devices is the scintillation light yield, as photon statistics limits the rejection of electron-recoil backgrounds by pulse shape discrimination. We have measured the light yield of DarkSide-10 using the readily-identifiable full-absorption peaks from gamma ray sources combined with single-photoelectron calibrations using low-occupancy laser pulses. For gamma lines of energies in the range 122-1275 keV, we get consistent light yields averaging 8.887+-0.003(stat)+-0.444(sys) p.e./keVee. With additional purification, the light yield measured at 511 keV increased to 9.142+-0.006(stat) p.e./keVee.
The veto system of the DarkSide-50 experiment
The DarkSide Collaboration,P. Agnes,L. Agostino,I. F. M. Albuquerque,T. Alexander,A. K. Alton,K. Arisaka,H. O. Back,B. Baldin,K. Biery,G. Bonfini,M. Bossa,B. Bottino,A. Brigatti,J. Brodsky,F. Budano,S. Bussino,M. Cadeddu,L. Cadonati,M. Cadoni,F. Calaprice,N. Canci,A. Candela,H. Cao,M. Cariello,M. Carlini,S. Catalanotti,P. Cavalcante,A. Chepurnov,A. G. Cocco,G. Covone,L. Crippa,D. D'Angelo,M. D'Incecco,S. Davini,S. De Cecco,M. De Deo,M. De Vincenzi,A. Derbin,A. Devoto,F. Di Eusanio,G. Di Pietro,E. Edkins,A. Empl,A. Fan,G. Fiorillo,K. Fomenko,G. Foster,D. Franco,F. Gabriele,C. Galbiati,C. Giganti,A. M. Goretti,F. Granato,L. Grandi,M. Gromov,M. Guan,Y. Guardincerri,B. R. Hackett,K. R. Herner,E. V. Hungerford,Aldo Ianni,Andrea Ianni,I. James,T. Johnson,C. Jollet,K. Keeter,C. L. Kendziora,V. Kobychev,G. Koh,D. Korablev,G. Korga,A. Kubankin,X. Li,M. Lissia,P. Lombardi,S. Luitz,Y. Ma,I. N. Machulin,A. Mandarano,S. M. Mari,J. Maricic,L. Marini,C. J. Martoff,A. Meregaglia,P. D. Meyers,T. Miletic,R. Milincic,D. Montanari,A. Monte,M. Montuschi,M. E. Monzani,P. Mosteiro,B. J. Mount,V. N. Muratova,P. Musico,J. Napolitano,A. Nelson,S. Odrowski,M. Orsini,F. Ortica,L. Pagani,M. Pallavicini,E. Pantic,S. Parmeggiano,K. Pelczar,N. Pelliccia,S. Perasso,A. Pocar,S. Pordes,D. A. Pugachev,H. Qian,K. Randle,G. Ranucci,A. Razeto,B. Reinhold,A. L. Renshaw,A. Romani,B. Rossi,N. Rossi,S. D. Rountree,D. Sablone,P. Saggese,R. Saldanha,W. Sands,S. Sangiorgio,C. Savarese,E. Segreto,D. A. Semenov,E. Shields
Physics , 2015,
Abstract: Nuclear recoil events produced by neutron scatters form one of the most important classes of background in WIMP direct detection experiments, as they may produce nuclear recoils that look exactly like WIMP interactions. In DarkSide-50, we both actively suppress and measure the rate of neutron-induced background events using our neutron veto, composed of a boron-loaded liquid scintillator detector within a water Cherenkov detector. This paper is devoted to the description of the neutron veto system of DarkSide-50, including the detector structure, the fundamentals of event reconstruction and data analysis, and basic performance parameters.
First Results from the DarkSide-50 Dark Matter Experiment at Laboratori Nazionali del Gran Sasso
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
Physics , 2014, DOI: 10.1016/j.physletb.2015.03.012
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) kg d 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 6.1x10^-44 cm^2 for a WIMP mass of 100 GeV/c^2.
The Electronics and Data Acquisition System of the DarkSide Dark Matter Search
The DarkSide Collaboration,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 Pieto,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. 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. M. Mari,J. Maricic,L. Marini,J. Martoff,A. Meregaglia,E. Meroni,P. D. Meyers,R. Milincic,D. Montanari,M. Montuschi,M. E. Monzani,P. Mosteiro,B. Mount,V. Muratova,P. Musico,A. Nelson,S. Odrowski,M. Okounkoa,M. Orsini,F. Ortica,L. Pagani,M. Pallavicini,E. Pantic,L. Papp,S. Parmeggiano,Bob 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,Suvorov,R. Tartaglia,J. Tatarowicz,G. Testera,A. Tonazzo,E. Unzhakov,R. B. Vogelaar,M. Wada,S. E. Walker,H. Wang,Y. Wang
Physics , 2014,
Abstract: It is generally inferred from astronomical measurements that Dark Matter (DM) comprises approximately 27\% of the energy-density of the universe. If DM is a subatomic particle, a possible candidate is a Weakly Interacting Massive Particle (WIMP), and the DarkSide-50 (DS) experiment is a direct search for evidence of WIMP-nuclear collisions. DS is located underground at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, and consists of three active, embedded components; an outer water veto (CTF), a liquid scintillator veto (LSV), and a liquid argon (LAr) time projection chamber (TPC). This paper describes the data acquisition and electronic systems of the DS detectors, designed to detect the residual ionization from such collisions.
Low radioactivity argon dark matter search results from the DarkSide-50 experiment
The DarkSide Collaboration,P. Agnes,L. Agostino,I. F. M. Albuquerque,T. Alexander,A. K. Alton,K. Arisaka,H. O. Back,B. Baldin,K. Biery,G. Bonfini,M. Bossa,B. Bottino,A. Brigatti,J. Brodsky,F. Budano,S. Bussino,M. Cadeddu,L. Cadonati,M. Cadoni,F. Calaprice,N. Canci,A. Candela,H. Cao,M. Cariello,M. Carlini,S. Catalanotti,P. Cavalcante,A. Chepurnov,A. G. Cocco,G. Covone,L. Crippa,D. D'Angelo,M. D'Incecco,S. Davini,S. De Cecco,M. De Deo,M. De Vincenzi,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,C. Giganti,A. M. Goretti,F. Granato,L. Grandi,M. Gromov,M. Guan,Y. Guardincerri,B. R. Hackett,K. Herner,E. V. Hungerford,Al. Ianni,An. Ianni,I. James,C. Jollet,K. Keeter,C. L. Kendziora,V. Kobychev,G. Koh,D. Korablev,G. Korga,A. Kubankin,X. Li,M. Lissia,P. Lombardi,S. Luitz,Y. Ma,I. N. Machulin,A. Mandarano,S. M. Mari,J. Maricic,L. Marini,C. J. Martoff,A. Meregaglia,P. D. Meyers,T. Miletic,R. Milincic,D. Montanari,A. Monte,M. Montuschi,M. Monzani,P. Mosteiro,B. J. Mount,V. N. Muratova,P. Musico,J. Napolitano,A. Nelson,S. Odrowski,M. Orsini,F. Ortica,L. Pagani,M. Pallavicini,E. Pantic,S. Parmeggiano,K. Pelczar,N. Pelliccia,S. Perasso,A. Pocar,S. Pordes,D. A. Pugachev,H. Qian,K. Randle,G. Ranucci,A. Razeto,B. Reinhold,A. L. Renshaw,A. Romani,B. Rossi,N. Rossi,D. Rountree,D. Sablone,P. Saggese,R. Saldanha,W. Sands,S. Sangiorgio,C. Savarese,E. Segreto,D. A. Semenov,E. Shields,P. N. Singh
Physics , 2015,
Abstract: The DarkSide-50 dark matter search reports the first results obtained using a target of low-radioactivity argon extracted from underground sources. The experiment is located at the Laboratori Nazionali del Gran Sasso and uses a two-phase time projection chamber as a detector. A total of 155 kg of low radioactivity argon has been obtained, and we have determined that underground argon is depleted in Ar-39 by a factor (1.4 +- 0.2) x 10^3 relative to atmospheric argon. The underground argon is also found to contain (2.05 +- 0.13) mBq/kg of Kr-85. We find no evidence for dark matter in the form of WIMPs in 70.9 live-days of data with a fiducial mass of (36.9 +- 0.6) kg. When combined with our preceding search with an atmospheric argon target, we set a 90 % C.L. upper limit on the WIMP-nucleon spin-independent cross section of 2.0 x 10^-44 cm^2 (8.6 x 10^-44 cm^2, 8.0 x 10^-43 cm^2) for a WIMP mass of 100 GeV/c^2 (1 TeV/c^2 , 10 TeV/c^2).
Study of the Structural and Electrical Properties of Cr-Doped BiFeO3 Ceramic  [PDF]
S. S. Arafat, S. Ibrahim
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.810051
Abstract: Multiferroic BiFe1-xCrxO3 (x = 0.2 and 0.4) ceramics were synthesized in a single phase. The effects of Cr3+ substitution on the crystal structure, dielectric permittivity and leakage current were investigated. Preliminary X-ray structural studies revealed that the samples had a rhombohedral perovskite crystal structure. The dielectric constant ε' significantly increased while the dielectric loss tanδ was substantially decreased with the increase in Cr3+ substitution. The temperature effect on the dielectric properties exhibited an anomaly corresponding to magneto-electric coupling in the samples and was shifted to lower temperatures with the increase in Cr3+ substitution. The leakage current density also reduced in magnitude with the increase in the Cr3+ substitution.
Degree Splitting of Root Square Mean Graphs  [PDF]
S. S. Sandhya, S. Somasundaram, S. Anusa
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.66086
Abstract: Let \"\" be an injective function. For a vertex labeling f, the induced edge labeling \"\" is defined by, \"\" or \"\"; then, the edge labels are distinct and are from \"\". Then f is called a root square mean labeling of G. In this paper, we prove root square mean labeling of some degree splitting graphs.
A Parameter Estimation Model of G-CSF: Mathematical Model of Cyclical Neutropenia  [PDF]
S. Balamuralitharan, S. Rajasekaran
American Journal of Computational Mathematics (AJCM) , 2012, DOI: 10.4236/ajcm.2012.21002
Abstract: We investigate the FFT (Fast Fourier Transform) model and G-CSF (granulocyte colony-stimulating factor) treatment of CN (Cyclical Neutropenia). We collect grey collies and normal dog’s data from CN and analyze the G-CSF treatment. The model develops the dynamics of circulating blood cells before and after the G-CSF treatment. This is quite natural and useful for the collection of laboratory data for investigation. The proposed interventions are practical. This reduces the quantity of G-CSF required for potential maintenance. This model gives us good result in treatment. The changes would be practical and reduce the risk side as well as the cost of treatment in G-CSF.
Synthesis, Thermal Behaviour, XRD, and Luminescent Properties of Lighter Lanthanidethiodipropionate Hydrates Containing Aminogunidine as Neutral Ligand  [PDF]
S. Packiaraj, S. Govindarajan
Open Journal of Inorganic Chemistry (OJIC) , 2014, DOI: 10.4236/ojic.2014.43006
Abstract:
Aminoguanidine lanthanide thiodipropionate hydrates of composition [Ln(Agun)2(tdp)3·nH2O], Agun = Aminoguanidine, tdp = thiodipropionic acid, where Ln = La, Pr, Nd and Sm if n = 2, have been prepared and characterized by physic-chemical techniques.
Fuzzy Based Intelligent Monitoring of Critical Lines in the Restructured Power Market  [PDF]
S. Rajasekaran, S. Sathiyamoorthy
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.79191
Abstract: Restructured electric market environment allows the power wheeling transactions between the power producers and customers to meet the growing load demand. This will lead to the possible of congestion in the transmission lines. The possible contingencies of power components further worsen the scenario. This paper describes the methodology for the identification of critical transmission line by computing the real power and reactive power performance indices. It also demonstrates the importance of fuzzy logic technique used to rank the transmission lines according to the severity and demonstrated on IEEE-30 bus system.
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