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Search Results: 1 - 10 of 401360 matches for " M. Wetstein "
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Measuring Directionality in Double-Beta Decay and Neutrino Interactions with Kiloton-Scale Scintillation Detectors
C. Aberle,A. Elagin,H. J. Frisch,M. Wetstein,L. Winslow
Physics , 2013, DOI: 10.1088/1748-0221/9/06/P06012
Abstract: Large liquid-scintillator-based detectors have proven to be exceptionally effective for low energy neutrino measurements due to their good energy resolution and scalability to large volumes. The addition of directional information using Cherenkov light and fast timing would enhance the scientific reach of these detectors, especially for searches for neutrino-less double-beta decay. In this paper, we develop a technique for extracting particle direction using the difference in arrival times for Cherenkov and scintillation light, and evaluate several detector advances in timing, photodetector spectral response, and scintillator emission spectra that could be used to make direction reconstruction a reality in a kiloton-scale detector.
STUDY ON THE CHEMICAL HETEROGENEITY OF CADMIUM AND LEAD IN THE BIOSPHERE - BIOACCUMULATION OF CADMIUM AND LEAD IN THE ORGANISM OF YOUNG RUMINANTS FROM ANTHROPOGENIC ECOSYSTEMS WITH AN INCREASED TECHNOGENIC CLARC
H HRISTEV,B BAYKOV,D PENKOV,C WILLEKE-WETSTEIN
Journal of Central European Agriculture , 2003,
Abstract: The technogenic Clarc of lead (Pb) and cadmium (Cd) from the upper soil layer and the forage plants in an industrially polluted region, so as the Pb and Cd input in the organism of young lambs and kid by the synthesis of secondary biological production have been investigated. For the synthesis of 1 kg secondary production in the organism of lambs, the input of Pb with the food and drinking water is 6.44 mg and 2.46 mg Cd and in the kid- organism- 21.41 mg Pb and 5.29 mg Cd. The obtained production in conditions of increased technogenic Clarc is with higher content of Pb and Cd, according the maximal admissible levels (EC- regulation 466/2001).
Expression of Interest: The Atmospheric Neutrino Neutron Interaction Experiment (ANNIE)
I. Anghel,J. F. Beacom,M. Bergevin,G. Davies,F. Di Lodovico,A. Elagin,H. Frisch,R. Hill,G. Jocher,T. Katori,J. Learned,R. Northrop,C. Pilcher,E. Ramberg,M. C. Sanchez,M. Smy,H. Sobel,R. Svoboda,S. Usman,M. Vagins,G. Varner,R. Wagner,M. Wetstein,L. Winslow,M. Yeh
Physics , 2014,
Abstract: Neutron tagging in Gadolinium-doped water may play a significant role in reducing backgrounds from atmospheric neutrinos in next generation proton-decay searches using megaton-scale Water Cherenkov detectors. Similar techniques might also be useful in the detection of supernova neutrinos. Accurate determination of neutron tagging efficiencies will require a detailed understanding of the number of neutrons produced by neutrino interactions in water as a function of momentum transferred. We propose the Atmospheric Neutrino Neutron Interaction Experiment (ANNIE), designed to measure the neutron yield of atmospheric neutrino interactions in gadolinium-doped water. An innovative aspect of the ANNIE design is the use of precision timing to localize interaction vertices in the small fiducial volume of the detector. We propose to achieve this by using early production of LAPPDs (Large Area Picosecond Photodetectors). This experiment will be a first application of these devices demonstrating their feasibility for Water Cherenkov neutrino detectors.
The Physics and Nuclear Nonproliferation Goals of WATCHMAN: A WAter CHerenkov Monitor for ANtineutrinos
M. Askins,M. Bergevin,A. Bernstein,S. Dazeley,S. T. Dye,T. Handler,A. Hatzikoutelis,D. Hellfeld,P. Jaffke,Y. Kamyshkov,B. J. Land,J. G. Learned,P. Marleau,C. Mauger,G. D. Orebi Gann,C. Roecker,S. D. Rountree,T. M. Shokair,M. B. Smy,R. Svoboda,M. Sweany,M. R. Vagins,K. A. van Bibber,R. B. Vogelaar,M. J. Wetstein,M. Yeh
Physics , 2015,
Abstract: This article describes the physics and nonproliferation goals of WATCHMAN, the WAter Cherenkov Monitor for ANtineutrinos. The baseline WATCHMAN design is a kiloton scale gadolinium-doped (Gd) light water Cherenkov detector, placed 13 kilometers from a civil nuclear reactor in the United States. In its first deployment phase, WATCHMAN will be used to remotely detect a change in the operational status of the reactor, providing a first- ever demonstration of the potential of large Gd-doped water detectors for remote reactor monitoring for future international nuclear nonproliferation applications. During its first phase, the detector will provide a critical large-scale test of the ability to tag neutrons and thus distinguish low energy electron neutrinos and antineutrinos. This would make WATCHMAN the only detector capable of providing both direction and flavor identification of supernova neutrinos. It would also be the third largest supernova detector, and the largest underground in the western hemisphere. In a follow-on phase incorporating the IsoDAR neutrino beam, the detector would have world-class sensitivity to sterile neutrino signatures and to non-standard electroweak interactions (NSI). WATCHMAN will also be a major, U.S. based integration platform for a host of technologies relevant for the Long-Baseline Neutrino Facility (LBNF) and other future large detectors. This white paper describes the WATCHMAN conceptual design,and presents the results of detailed simulations of sensitivity for the project's nonproliferation and physics goals. It also describes the advanced technologies to be used in WATCHMAN, including high quantum efficiency photomultipliers, Water-Based Liquid Scintillator (WbLS), picosecond light sensors such as the Large Area Picosecond Photo Detector (LAPPD), and advanced pattern recognition and particle identification methods.
Letter of Intent: The Accelerator Neutrino Neutron Interaction Experiment (ANNIE)
I. Anghel,J. F. Beacom,M. Bergevin,C. Blanco,E. Catano-Mur,F. Di Lodovico,A. Elagin,H. Frisch,J. Griskevich,R. Hill,G. Jocher,T. Katori,F. Krennrich,J. Learned,M. Malek,R. Northrop,C. Pilcher,E. Ramberg,J. Repond,R. Sacco,M. C. Sanchez,M. Smy,H. Sobel,R. Svoboda,S. M. Usman,M. Vagins,G. Varner,R. Wagner,A. Weinstein,M. Wetstein,L. Winslow,L. Xia,M. Yeh
Physics , 2015,
Abstract: Neutron tagging in Gadolinium-doped water may play a significant role in reducing backgrounds from atmospheric neutrinos in next generation proton-decay searches using megaton-scale Water Cherenkov detectors. Similar techniques might also be useful in the detection of supernova neutrinos. Accurate determination of neutron tagging efficiencies will require a detailed understanding of the number of neutrons produced by neutrino interactions in water as a function of momentum transferred. We propose the Atmospheric Neutrino Neutron Interaction Experiment (ANNIE), designed to measure the neutron yield of atmospheric neutrino interactions in gadolinium-doped water. An innovative aspect of the ANNIE design is the use of precision timing to localize interaction vertices in the small fiducial volume of the detector. We propose to achieve this by using early production of LAPPDs (Large Area Picosecond Photodetectors). This experiment will be a first application of these devices demonstrating their feasibility for Water Cherenkov neutrino detectors.
Sensor Compendium
M. Artuso,M. Battaglia,G. Bolla,D. Bortoletto,B. Cabrera,J. E. Carlstrom,C. L. Chang,W. Cooper,C. Da Via,M. Demarteau,J. Fast,H. Frisch,M. Garcia-Sciveres,S. Golwala,C. Haber,J. Hall,E. Hoppe,K. D. Irwin,H. Kagan,C. Kenney,A. T. Lee,D. Lynn,J. Orrell,M. Pyle,R. Rusack,H. Sadrozinski,M. C. Sanchez,A. Seiden,W. Trischuk,J. Vavra,M. Wetstein,R-Y. Zhu
Physics , 2013,
Abstract: Sensors play a key role in detecting both charged particles and photons for all three frontiers in Particle Physics. The signals from an individual sensor that can be used include ionization deposited, phonons created, or light emitted from excitations of the material. The individual sensors are then typically arrayed for detection of individual particles or groups of particles. Mounting of new, ever higher performance experiments, often depend on advances in sensors in a range of performance characteristics. These performance metrics can include position resolution for passing particles, time resolution on particles impacting the sensor, and overall rate capabilities. In addition the feasible detector area and cost frequently provides a limit to what can be built and therefore is often another area where improvements are important. Finally, radiation tolerance is becoming a requirement in a broad array of devices. We present a status report on a broad category of sensors, including challenges for the future and work in progress to solve those challenges
The OscSNS White Paper
OscSNS Collaboration,R. Allen,F. T. Avignone,J. Boissevain,Y. Efremenko,M. Elnimr,T. Gabriel,F. G. Garcia,G. T. Garvey,T. Handler,W. Huelsnitz,R. Imlay,Y. Kamyshkov,J. M. Link,W. C. Louis,G. B. Mills,S. R. Mishra,B. Osmanov,Z. Pavlovic,H. Ray,B. P. Roe,C. Rosenfeld,I. Stancu,R. Svoboda,R. Tayloe,R. Van de Water,M. J. Wetstein,D. H. White,M. Yeh
Physics , 2013,
Abstract: There exists a need to address and resolve the growing evidence for short-baseline neutrino oscillations and the possible existence of sterile neutrinos. Such non-standard particles require a mass of $\sim 1$ eV/c$^2$, far above the mass scale associated with active neutrinos, and were first invoked to explain the LSND $\bar \nu_\mu \rightarrow \bar \nu_e$ appearance signal. More recently, the MiniBooNE experiment has reported a $2.8 \sigma$ excess of events in antineutrino mode consistent with neutrino oscillations and with the LSND antineutrino appearance signal. MiniBooNE also observed a $3.4 \sigma$ excess of events in their neutrino mode data. Lower than expected neutrino-induced event rates using calibrated radioactive sources and nuclear reactors can also be explained by the existence of sterile neutrinos. Fits to the world's neutrino and antineutrino data are consistent with sterile neutrinos at this $\sim 1$ eV/c$^2$ mass scale, although there is some tension between measurements from disappearance and appearance experiments. In addition to resolving this potential major extension of the Standard Model, the existence of sterile neutrinos will impact design and planning for all future neutrino experiments. It should be an extremely high priority to conclusively establish if such unexpected light sterile neutrinos exist. The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, built to usher in a new era in neutron research, provides a unique opportunity for US science to perform a definitive world-class search for sterile neutrinos.
Advanced Scintillator Detector Concept (ASDC): A Concept Paper on the Physics Potential of Water-Based Liquid Scintillator
J. R. Alonso,N. Barros,M. Bergevin,A. Bernstein,L. Bignell,E. Blucher,F. Calaprice,J. M. Conrad,F. B. Descamps,M. V. Diwan,D. A. Dwyer,S. T. Dye,A. Elagin,P. Feng,C. Grant,S. Grullon,S. Hans,D. E. Jaffe,S. H. Kettell,J. R. Klein,K. Lande,J. G. Learned,K. B. Luk,J. Maricic,P. Marleau,A. Mastbaum,W. F. McDonough,L. Oberauer,G. D. Orebi Gann,R. Rosero,S. D. Rountree,M. C. Sanchez,M. H. Shaevitz,T. M. Shokair,M. B. Smy,A. Stahl,M. Strait,R. Svoboda,N. Tolich,M. R. Vagins,K. A. van Bibber,B. Viren,R. B. Vogelaar,M. J. Wetstein,L. Winslow,B. Wonsak,E. T. Worcester,M. Wurm,M. Yeh,C. Zhang
Physics , 2014,
Abstract: The recent development of Water-based Liquid Scintillator (WbLS), and the concurrent development of high-efficiency and high-precision-timing light sensors, has opened up the possibility for a new kind of large-scale detector capable of a very broad program of physics. The program would include determination of the neutrino mass hierarchy and observation of CP violation with long-baseline neutrinos, searches for proton decay, ultra-precise solar neutrino measurements, geo- and supernova neutrinos including diffuse supernova antineutrinos, and neutrinoless double beta decay. We outline here the basic requirements of the Advanced Scintillation Detector Concept (ASDC), which combines the use of WbLS, doping with a number of potential isotopes for a range of physics goals, high efficiency and ultra-fast timing photosensors, and a deep underground location. We are considering such a detector at the Long Baseline Neutrino Facility (LBNF) far site, where the ASDC could operate in conjunction with the liquid argon tracking detector proposed by the LBNE collaboration. The goal is the deployment of a 30-100 kiloton-scale detector, the basic elements of which are being developed now in experiments such as WATCHMAN, ANNIE, SNO+, and EGADS.
Study of Duct Characteristics Deduced from Low Latitude Ground Observations of Day-Time Whistler at Jammu  [PDF]
M. Altaf, M. M. Ahmad
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.33032
Abstract:

Propagation characteristics of low latitude whistler duct characteristics have been investigated based on day-time measurements at Jammu. The morphogical characteristics of low latitude whistlers are discussed and compared with characteristics of middle and high latitude whistlers. The Max. electron density (Nm) at the height of the ionosphere obtained from whistler dispersion comes out to be higher than that of the background which is in accordance with the characteristics of whistler duct. The equivalent width is found to be close to the satellite observations and the characteristics of whistler duct in low latitude ionosphere are similar to those in middle and high latitude ionosphere. The width of ducts estimated from the diffuseness of the whistler track observed during magnetic storm is found to lie in the range of 50 - 200 Km.

Review Article: Immobilized Molecules Using Biomaterials and Nanobiotechnology  [PDF]
Magdy M. M. Elnashar
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2010, DOI: 10.4236/jbnb.2010.11008
Abstract: Immobilized molecules using biomaterials and nanobiotechnology is a very interesting topic that touching almost all aspects of our life. It uses the sciences of biology, chemistry, physics, materials engineering and computer science to develop instruments and products that are at the cutting edge of some of today’s most promising scientific frontiers. In this review article, the author based on his experience in this arena has tried to focus on some of the supports for im-mobilization; the most important molecules to be immobilized such as DNA, cells, enzymes, metals, polysaccharides, etc and their applications in medicine, food, drug, water treatment, energy and even in aerospace. He specified a special section on what is new in the arena of supports and technologies used in enzyme immobilization and finally a recommendation by the author for future work with a special attention to up-to-date references.
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