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Search Results: 1 - 10 of 462012 matches for " A. Piepke "
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Uncertainties in the Anti-neutrino Production at Nuclear Reactors
Z. Djurcic,J. A. Detwiler,A. Piepke,V. R. Foster Jr.,L. Miller,G. Gratta
Physics , 2008, DOI: 10.1088/0954-3899/36/4/045002
Abstract: Anti-neutrino emission rates from nuclear reactors are determined from thermal power measurements and fission rate calculations. The uncertainties in these quantities for commercial power plants and their impact on the calculated interaction rates in electron anti-neutrino detectors is examined. We discuss reactor-to-reactor correlations between the leading uncertainties and their relevance to reactor anti-neutrino experiments.
Igreja, Miss o, Antropologia: um balan o do Instituto Anthropos (Alemanha)
Joachim G. Piepke
REVER : Revista de Estudos da Religi?o , 2007,
Abstract:
Novel Technique for Ultra-sensitive Determination of Trace Elements in Organic Scintillators
Z. Djurcic,D. Glasgow,L-W. Hu,R. D. McKeown,A. Piepke,R. Swinney,B. Tipton
Physics , 2002, DOI: 10.1016/S0168-9002(03)01362-7
Abstract: A technique based on neutron activation has been developed for an extremely high sensitivity analysis of trace elements in organic materials. Organic materials are sealed in plastic or high purity quartz and irradiated at the HFIR and MITR. The most volatile materials such as liquid scintillator (LS) are first preconcentrated by clean vacuum evaporation. Activities of interest are separated from side activities by acid digestion and ion exchange. The technique has been applied to study the liquid scintillator used in the KamLAND neutrino experiment. Detection limits of <2.4X10**-15 g 40K/g LS, <5.5X10**-15 g Th/g LS, and <8X10**-15 g U/g LS have been achieved.
Double beta decay of $^{48}$Ca
A. Balysh,A. De Silva,V. I. Lebedev,K. Lou,M. K. Moe,M. A. Nelson,A. Piepke,A. Pronskiy,M. A. Vient,P. Vogel
Physics , 1996, DOI: 10.1103/PhysRevLett.77.5186
Abstract: $^{48}$Ca, the lightest double beta decay candidate, is the only one simple enough to be treated exactly in the nuclear shell model. Thus, the $\beta\beta(2\nu)$ half-life measurement, reported here, provides a unique test of the nuclear physics involved in the $\beta\beta$ matrix element calculation. Enriched $^{48}$Ca sources of two different thicknesses have been exposed in a time projection chamber, and yield T$_{1/2}^{2\nu} = (4.3^{+2.4}_{-1.1} [{\rm stat.}] \pm 1.4 [{\rm syst.}]) \times 10^{19}$ years, compatible with the shell model calculations.
Detection of very small neutrino masses in double-beta decay using laser tagging
M. Danilov,R. DeVoe,A. Dolgolenko,G. Giannini,G. Gratta,P. Picchi,A. Piepke,F. Pietropaolo,P. Vogel,J-L. Vuilleumier,Y-F. Wang,O. Zeldovich
Physics , 2000, DOI: 10.1016/S0370-2693(00)00404-4
Abstract: We describe an approach to the study of neutrino masses that combines quantum optics techniques with radiation detectors to obtain unprecedented sensitivity. With it the search for Majorana neutrino masses down to $\sim$10 meV will become accessible. The experimental technique uses the possibility of individually detecting $\rm Ba^+$-ions in the final state of $\rm ^{136}Xe$ double-beta decay via resonant excitation with a set of lasers aimed at a specific location in a large Time Projection Chamber. The specificity of the atomic levels provides tagging and, together with more traditional event recognition parameters, greatly suppresses radioactive backgrounds.
Characterization of Silicon Photomultipliers for nEXO
I. Ostrovskiy,F. Retiere,D. Auty,J. Dalmasson,T. Didberidze,R. DeVoe,G. Gratta,L. Huth,L. James,L. Lupin-Jimenez,N. Ohmert,A. Piepke
Physics , 2015, DOI: 10.1109/TNS.2015.2453932
Abstract: Silicon Photomultipliers (SiPMs) are attractive candidates for light detectors for next generation liquid xenon double-beta decay experiments, like nEXO. In this paper we discuss the requirements that the SiPMs must satisfy in order to be suitable for nEXO and similar experiments, describe the two test setups operated by the nEXO collaboration, and present the results of characterization of SiPMs from several vendors. In particular, we find that the photon detection efficiency at the peak of xenon scintillation light emission (175-178 nm) approaches the nEXO requirements for tested FBK and Hamamatsu devices. Additionally, the nEXO collaboration performed radioassay of several grams of bare FBK devices using neutron activation analysis, indicating levels of 40K, 232Th, and 238U of the order of <0.15, (6.9e10-4 - 1.3e10-2), and <0.11 mBq/kg, respectively.
Neutron production by cosmic-ray muons at shallow depth
F. Boehm,J. Busenitz,B. Cook,G. Gratta,H. Henrikson,J. Kornis D. Lawrence,K. B. Lee,K. McKinny,L. Miller,V. Novikov,A. Piepke,B. Ritchie,D. Tracy,P. Vogel,Y-F. Wang,J. Wolf
Physics , 2000, DOI: 10.1103/PhysRevD.62.092005
Abstract: The yield of neutrons produced by cosmic ray muons at a shallow depth of 32 meters of water equivalent has been measured. The Palo Verde neutrino detector, containing 11.3 tons of Gd loaded liquid scintillator and 3.5 tons of acrylic served as a target. The rate of one and two neutron captures was determined. Modeling the neutron capture efficiency allowed us to deduce the total yield of neutrons $ Y_{tot} = (3.60 \pm 0.09 \pm 0.31) \times 10^{-5}$ neutrons per muon and g/cm$^2$. This yield is consistent with previous measurements at similar depths.
Results from the Palo Verde Neutrino Oscillation Experiment
F. Boehm,J. Busenitz,B. Cook,G. Gratta,H. Henrikson,J. Kornis,D. Lawrence,K. B. Lee,K. McKinny,L. Miller,V. Novikov,A. Piepke,B. Ritchie,D. Tracy,P. Vogel,Y-F. Wang,J. Wolf
Physics , 2000, DOI: 10.1103/PhysRevD.62.072002
Abstract: The $\nuebar$ flux and spectrum have been measured at a distance of about 800 m from the reactors of the Palo Verde Nuclear Generating Station using a segmented Gd-loaded liquid scintillator detector. Correlated positron-neutron events from the reaction $\nuebar$p$\to$e^+n were recorded for a period of 200 d including 55 d with one of the three reactors off for refueling. Backgrounds were accounted for by making use of the reactor-on and reactor-off cycles, and also with a novel technique based on the difference between signal and background under reversal of the e^+ and n portions of the events. A detailed description of the detector calibration, background subtraction, and data analysis is presented here. Results from the experiment show no evidence for neutrino oscillations. $\nuebar\to\bar\nu_x$ oscillations were excluded at 90% CL for $\dm>1.12\times10^{-3}$ eV^2 for full mixing, and $\sinq>0.21$ for large $\dm$. These results support the conclusion that the observed atmospheric neutrino oscillations does not involve $\nu_{\rm e}$.
Search for Neutrino Oscillations at the Palo Verde Nuclear Reactors
F. Boehm,J. Busenitz,B. Cook,G. Gratta,H. Henrikson,J. Kornis,D. Lawrence,K. B. Lee,K. McKinny,L. Miller,V. Novikov,A. Piepke,B. Ritchie,D. Tracy,P. Vogel,Y-F. Wang,J. Wolf
Physics , 1999, DOI: 10.1103/PhysRevLett.84.3764
Abstract: We report on the initial results from a measurement of the anti-neutrino flux and spectrum at a distance of about 800 m from the three reactors of the Palo Verde Nuclear Generating Station using a segmented gadolinium-loaded scintillation detector. We find that the anti-neutrino flux agrees with that predicted in the absence of oscillations to better than 5%, excluding at 90% CL $\rm\bar\nu_e - \bar\nu_x$ oscillations with $\Delta m^2 > 1.12\times 10^{-3}$ eV^2 for maximal mixing and $\sin^2{2\theta} > 0.21$ for large $\Delta m^2$.
Final results from the Palo Verde Neutrino Oscillation Experiment
F. Boehm,J. Busenitz,B. Cook,G. Gratta,H. Henrikson,J. Kornis,D. Lawrence,K. B. Lee,K. McKinney,L. Miller,V. Novikov,A. Piepke,B. Ritchie,D. Tracy,P. Vogel,Y-F. Wang,J. Wolf
Physics , 2001, DOI: 10.1103/PhysRevD.64.112001
Abstract: The analysis and results are presented from the complete data set recorded at Palo Verde between September 1998 and July 2000. In the experiment, the $\nuebar$ interaction rate has been measured at a distance of 750 and 890 m from the reactors of the Palo Verde Nuclear Generating Station for a total of 350 days, including 108 days with one of the three reactors off for refueling. Backgrounds were determined by (a) the $swap$ technique based on the difference between signal and background under reversal of the positron and neutron parts of the correlated event and (b) making use of the conventional reactor-on and reactor-off cycles. There is no evidence for neutrino oscillation and the mode $\nuebar\to\bar\nu_x$ was excluded at 90% CL for $\dm>1.1\times10^{-3}$ eV$^2$ at full mixing, and $\sinq>0.17$ at large $\dm$.
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