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Search Results: 1 - 10 of 325400 matches for " S. Kidner "
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The Nylon Scintillator Containment Vessels for the Borexino Solar Neutrino Experiment
J. Benziger,L. Cadonati,F. Calaprice,E. de Haas,R. Fernholz,R. Ford,C. Galbiati,A. Goretti,E. Harding,An. Ianni,S. Kidner,M. Leung,F. Loeser,K. McCarty,A. Nelson,R. Parsells,A. Pocar,T. Shutt,A. Sonnenschein,R. B. Vogelaar
Physics , 2007, DOI: 10.1016/j.nima.2007.08.176
Abstract: Borexino is a solar neutrino experiment designed to observe the 0.86 MeV Be-7 neutrinos emitted in the pp cycle of the sun. Neutrinos will be detected by their elastic scattering on electrons in 100 tons of liquid scintillator. The neutrino event rate in the scintillator is expected to be low (~0.35 events per day per ton), and the signals will be at energies below 1.5 MeV, where background from natural radioactivity is prominent. Scintillation light produced by the recoil electrons is observed by an array of 2240 photomultiplier tubes. Because of the intrinsic radioactive contaminants in these PMTs, the liquid scintillator is shielded from them by a thick barrier of buffer fluid. A spherical vessel made of thin nylon film contains the scintillator, separating it from the surrounding buffer. The buffer region itself is divided into two concentric shells by a second nylon vessel in order to prevent inward diffusion of radon atoms. The radioactive background requirements for Borexino are challenging to meet, especially for the scintillator and these nylon vessels. Besides meeting requirements for low radioactivity, the nylon vessels must also satisfy requirements for mechanical, optical, and chemical properties. The present paper describes the research and development, construction, and installation of the nylon vessels for the Borexino experiment.
A Scintillator Purification System for the Borexino Solar Neutrino Detector
J. Benziger,L. Cadonati,F. Calaprice,M. Chen,A. Corsi,F. Dalnoki-Veress,R. Fernholz,R. Ford,C. Galbiati,A. Goretti,E. Harding,Aldo Ianni,Andrea Ianni,S. Kidner,M. Leung,F. Loeser,K. McCarty,D. McKinsey,A. Nelson,A. Pocar,C. Salvo,D. Schimizzi,T. Shutt,A. Sonnenschein
Physics , 2007, DOI: 10.1016/j.nima.2007.12.043
Abstract: Purification of the 278 tons of liquid scintillator and 889 tons of buffer shielding for the Borexino solar neutrino detector was performed with a system that combined distillation, water extraction, gas stripping and filtration. The purification of the scintillator achieved unprecedented low backgrounds for the large scale liquid scintillation detector. This paper describes the principles of operation, design, construction and commissioning of the purification system, and reviews the requirements and methods to achieve system cleanliness and leak-tightness.
Borexino calibrations: Hardware, Methods, and Results
Borexino collaboration,H. Back,G. Bellini,J. Benziger,D. Bick,G. Bonfini,D. Bravo,M. Buizza Avanzini,B. Caccianiga,L. Cadonati,F. Calaprice,C. Carraro,P. Cavalcante,A. Chavarria,D. D'Angelo,S. Davini,A. Derbin,A. Etenko,F. von Feilitzsch,G. Fernandes,K. Fomenko,D. Franco,C. Galbiati,S. Gazzana,C. Ghiano,M. Giammarchi,M. Goeger-Neff,A. Goretti,L. Grandi,E. Guardincerri,S. Hardy,Aldo Ianni,Andrea Ianni,A. Kayunov,S. Kidner,V. Kobychev,D. Korablev,G. Korga,Y. Koshio,D. Kryn,M. Laubenstein,T. Lewke,E. Litvinovich,B. Loer,F. Lombardi,P. Lombardi,L. Ludhova,I. Machulin,S. Manecki,W. Maneschg,G. Manuzio,Q. Meindl,E. Meroni,L. Miramonti,M. Misiaszek,D. Montanari,P. Mosteiro,V. Muratova,L. Oberauer,M. Obolensky,F. Ortica,K. Otis,M. Pallavicini,L. Papp,L. Perasso,S. Perasso,A. Pocar,R. S. Raghavan,G. Ranucci,A. Razeto,A. Re,A. Romani,N. Rossi,D. Rountree,A. Sabelnikov,R. Saldanha,C. Salvo,S. Schonert,H. Simgen,M. Skorokhvatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,D. Vignaud,R. B. Vogelaar,J. Winter,M. Wojcik,A. Wright,M. Wurm,J. Xu,O. Zaimidoroga,S. Zavatarelli,G. Zuzel
Physics , 2012, DOI: 10.1088/1748-0221/7/10/P10018
Abstract: Borexino was the first experiment to detect solar neutrinos in real-time in the sub-MeV region. In order to achieve high precision in the determination of neutrino rates, the detector design includes an internal and an external calibration system. This paper describes both calibration systems and the calibration campaigns that were carried out in the period between 2008 and 2011. We discuss some of the results and show that the calibration procedures preserved the radiopurity of the scintillator. The calibrations provided a detailed understanding of the detector response and led to a significant reduction of the systematic uncertainties in the Borexino measurements.
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.
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.
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.
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