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Search Results: 1 - 10 of 144431 matches for " F. Kaether "
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Reanalysis of the GALLEX solar neutrino flux and source experiments
F. Kaether,W. Hampel,G. Heusser,J. Kiko,T. Kirsten
Physics , 2010, DOI: 10.1016/j.physletb.2010.01.030
Abstract: After the completion of the gallium solar neutrino experiments at the Laboratori Nazionali del Gran Sasso (GALLEX}: 1991-1997; GNO: 1998-2003) we have retrospectively updated the GALLEX results with the help of new technical data that were impossible to acquire for principle reasons before the completion of the low rate measurement phase (that is, before the end of the GNO solar runs). Subsequent high rate experiments have allowed the calibration of absolute internal counter efficiencies and of an advanced pulse shape analysis for counter background discrimination. The updated overall result for GALLEX (only) is (73.4 +7.1 -7.3) SNU. This is 5.3% below the old value of (77.5 + 7.5 -7.8) SNU (PLB 447 (1999) 127-133) with a substantially reduced error. A similar reduction is obtained from the reanalysis of the 51Cr neutrino source experiments of 1994/1995.
PMT Test Facility at MPIK Heidelberg and Double Chooz Super Vertical Slice
J. Haser,F. Kaether,C. Langbrandtner,M. Lindner,B. Reinhold,S. Sch?nert
Physics , 2012, DOI: 10.1016/j.nuclphysbps.2012.09.093
Abstract: Proceedings supplement for conference poster at Neutrino 2010, Athens, Greece.
Transit Time and Charge Correlations of Single Photoelectron Events in R7081 PMTs
Florian Kaether,Conradin Langbrandtner
Physics , 2012, DOI: 10.1088/1748-0221/7/09/P09002
Abstract: During the calibration phase of the photomultiplier tubes (PMT) for the Double Chooz experiment the PMT response to light with single photoelectron (SPE) intensity was analysed. With our setup we were able to measure the combined transit time and charge response of the PMT and therefore we could deconstruct and analyse all physical effects having an influence on the PMT signal. Based on this analysis charge and time correlated probability density functions were developed to include the PMT response in a Monte Carlo simulation.
Qualification Tests of 474 Photomultiplier Tubes for the Inner Detector of the Double Chooz Experiment
C. Bauer,E. Borger,R. Hofacker,K. J?nner,F. Kaether,C. Langbrandtner,M. Lindner,S. Lucht,M. Reissfelder,S. Sch?nert,A. Stüken,C. Wiebusch
Physics , 2011, DOI: 10.1088/1748-0221/6/06/P06008
Abstract: The hemispherical 10" photomultiplier tube (PMT) R7081 from Hamamatsu Photonics K.K. (HPK) is used in various experiments in particle and astroparticle physics. We describe the test and calibration of 474 PMTs for the reactor antineutrino experiment Double Chooz. The unique test setup at Max-Planck-Institut f\"ur Kernphysik Heidelberg (MPIK) allows one to calibrate 30 PMTs simultaneously and to characterize the single photo electron response, transit time spread, linear behaviour and saturation effects, photon detection efficiency and high voltage calibration.
The BNO-LNGS joint measurement of the solar neutrino capture rate in 71Ga
J. N. Abdurashitov,T. J. Bowles,C. Cattadori,B. T. Cleveland,S. R. Elliott,N. Ferrari,V. N. Gavrin,S. V. Girin,V. V. Gorbachev,P. P Gurkina,W. Hampel,T. V. Ibragimova,F. Kaether,A. V. Kalikhov,N. G. Khairnasov,T. V. Knodel,I. N. Mirmov,L. Pandola,H. Richter,A. A. Shikhin,W. A. Teasdale,E. P. Veretenkin,V. M. Vermul,J. F. Wilkerson,V. E. Yants,G. T. Zatsepin
Physics , 2005, DOI: 10.1016/j.astropartphys.2006.03.008
Abstract: We describe a cooperative measurement of the capture rate of solar neutrinos by the reaction 71Ga(\nu_e,e^-)71Ge. Extractions were made from a portion of the gallium target in the Russian-American Gallium Experiment SAGE and the extraction samples were transported to the Gran Sasso laboratory for synthesis and counting at the Gallium Neutrino Observatory GNO. Six extractions of this type were made and the resultant solar neutrino capture rate was 64 ^{+24}_{-22} SNU, which agrees well with the overall result of the gallium experiments. The major purpose of this experiment was to make it possible for SAGE to continue their regular schedule of monthly solar neutrino extractions without interruption while a separate experiment was underway to measure the response of 71Ga to neutrinos from an 37Ar source. As side benefits, this experiment proved the feasibility of long-distance sample transport in ultralow background radiochemical experiments and familiarized each group with the methods and techniques of the other.
NOD2-C2 - a novel NOD2 isoform activating NF-κB in a muramyl dipeptide-independent manner
Marcel Kramer, Janne Boeck, Daniela Reichenbach, Christoph Kaether, Stefan Schreiber, Matthias Platzer, Philip Rosenstiel, Klaus Huse
BMC Research Notes , 2010, DOI: 10.1186/1756-0500-3-224
Abstract: Here, we report a novel alternative transcript of the NOD2 gene, which codes for a truncated tandem CARD only protein, called NOD2-C2. The transcript isoform is highest expressed in leucocytes, a natural barrier against pathogen invasion, and is strictly linked to promoter usage as well as predominantly to one allele of the single nucleotide polymorphism rs2067085. Contrary to a previously identified truncated single CARD NOD2 isoform, NOD2-S, NOD2-C2 is able to activate NF-κB in a dose dependent manner independently of muramyl dipeptide (MDP). On the other hand NOD2-C2 competes with MDPs ability to activate the NOD2-driven NF-κB signaling cascade.NOD2 transcripts having included an alternative exon downstream of exon 3 (exon 3a) are the endogenous equivalents of a previously described in vitro construct with the putative protein composed of only the two N-terminal CARDs. This protein form (NOD2-C2) activates NF-κB independent of an MDP stimulus and is a potential regulator of NOD2 signaling.The innate immune system uses several molecules that sense pathogen-associated molecular patterns (PAMPs) including Toll-like, RIG-1 (retinoic acid inducible gene protein 1)-like and the NOD (nucleotide-binding and oligomerization domain)-like receptors (NLRs) to trigger a protective response against intracellular danger signals, e.g. cytoinvasive pathogens. The NLRs family consists of more than 20 related members defined by a tripartite structure consisting of: (i) a variable N-terminal protein-protein interaction domain, defined by the caspase recruitment domain (CARD), pyrin domain (PYD), or the baculovirus inhibitor domain (BIR); (ii) a centrally located NOD domain facilitating self-oligomerization during activation [1], and (iii) a C-terminal leucine-rich repeat (LRR) responsible for binding/detecting of PAMPs. The N-terminal effector binding domains are essential elements of the NLRs to elicit a signal subsequent to NLR activation. In case of NOD1 and NOD2 (CARD15), the N-
Complete results for five years of GNO solar neutrino observations
GNO COLLABORATION,M. Altmann,M. Balata,P. Belli,E. Bellotti,R. Bernabei,E. Burkert,C. Cattadori,R. Cerulli,M. Chiarini,M. Cribier,S. d'Angelo,G. Del Re,K. H. Ebert,F. v. Feilitzsch,N. Ferrari,W. Hampel,F. X. Hartmann,E. Henrich,G. Heusser,F. Kaether,J. Kiko,T. Kirsten,T. Lachenmaier,J. Lanfranchi,M. Laubenstein,K. Luetzenkirchen,K. Mayer,P. Moegel,D. Motta,S. Nisi,J. Oehm,L. Pandola,F. Petricca,W. Potzel,H. Richter,S. Schoenert,M. Wallenius,M. Wojcik,L. Zanotti
Statistics , 2005, DOI: 10.1016/j.physletb.2005.04.068
Abstract: We report the complete GNO solar neutrino results for the measuring periods GNO III, GNO II, and GNO I. The result for GNO III (last 15 solar runs) is [54.3 + 9.9 - 9.3 (stat.)+- 2.3 (syst.)] SNU (1 sigma) or [54.3 + 10.2 - 9.6 (incl. syst.)] SNU (1 sigma) with errors combined. The GNO experiment is now terminated after altogether 58 solar exposure runs that were performed between May 20, 1998 and April 9, 2003. The combined result for GNO (I+II+III) is [62.9 + 5.5 - 5.3 (stat.) +- 2.5 (syst.)] SNU (1 sigma) or [62.9 + 6.0 - 5.9] SNU (1 sigma) with errors combined in quadrature. Overall, gallium based solar observations at LNGS (first in GALLEX, later in GNO) lasted from May 14, 1991 through April 9, 2003. The joint result from 123 runs in GNO and GALLEX is [69.3 +- 5.5 (incl. syst.)] SNU (1 sigma). The distribution of the individual run results is consistent with the hypothesis of a neutrino flux that is constant in time. Implications from the data in particle- and astrophysics are reiterated.
Detection of $^{133}$Xe from the Fukushima nuclear power plant in the upper troposphere above Germany
Hardy Simgen,Frank Arnold,Heinfried Aufmhoff,Robert Baumann,Florian Kaether,Sebastian Lindemann,Ludwig Rauch,Hans Schlager,Clemens Schlosser,Ulrich Schumann
Physics , 2013, DOI: 10.1016/j.jenvrad.2014.02.002
Abstract: After the accident in the Japanese Fukushima Dai-ichi nuclear power plant in March 2011 large amounts of radioactivity were released and distributed in the atmosphere. Among them were also radioactive noble gas isotopes which can be used as tracers to test global atmospheric circulation models. This work presents unique measurements of the radionuclide $^{133}$Xe from Fukushima in the upper troposphere above Germany. The measurements involve air sampling in a research jet aircraft followed by chromatographic xenon extraction and ultra-low background gas counting with miniaturized proportional counters. With this technique a detection limit of the order of 100 $^{133}$Xe atoms in litre-scale air samples (corresponding to about 100 mBq/m$^3$) is achievable. Our results provide proof that the $^{133}$Xe-rich ground level air layer from Fukushima was lifted up to the tropopause and distributed hemispherically. Moreover, comparisons with ground level air measurements indicate that the arrival of the radioactive plume at high altitude over Germany occurred several days before the ground level plume.
Afterpulse Measurements of R7081 Photomultipliers for the Double Chooz Experiment
Julia Haser,Florian Kaether,Conradin Langbrandtner,Manfred Lindner,Sebastian Lucht,Stefan Roth,Manuel Schumann,Achim Stahl,Anselm Stueken,Christopher Wiebusch
Physics , 2013, DOI: 10.1088/1748-0221/8/04/P04029
Abstract: We present the results of afterpulse measurements performed as qualification test for 473 inner detector photomultipliers of the Double Chooz experiment. The measurements include the determination of a total afterpulse occurrence probability as well as an average time distribution of these pulses. Additionally, more detailed measurements with different light sources and simultaneous charge and timing measurements were performed with a few photomultipliers to allow a more detailed understanding of the effect. The results of all measurements are presented and discussed.
First Axion Results from the XENON100 Experiment
The XENON100 Collaboration,E. Aprile,F. Agostini,M. Alfonsi,K. Arisaka,F. Arneodo,M. Auger,C. Balan,P. Barrow,L. Baudis,B. Bauermeister,A. Behrens,P. Beltrame,K. Bokeloh,A. Brown,E. Brown,S. Bruenner,G. Bruno,R. Budnik,J. M. R. Cardoso,A. P. Colijn,H. Contreras,J. P. Cussonneau,M. P. Decowski,E. Duchovni,S. Fattori,A. D. Ferella,W. Fulgione,F. Gao,M. Garbini,C. Geis,L. W. Goetzke,C. Grignon,E. Gross,W. Hampel,R. Itay,F. Kaether,G. Kessler,A. Kish,H. Landsman,R. F. Lang,M. Le Calloch,D. Lellouch,C. Levy,S. Lindemann,M. Lindner,J. A. M. Lopes,K. Lung,A. Lyashenko,S. Macmullin,T. Marrodan Undagoitia,J. Masbou,F. V. Massoli,D. Mayani Paras,A. J. Melgarejo Fernandez,Y. Meng,M. Messina,B. Miguez,A. Molinario,M. Murra,J. Naganoma,U. Oberlack,S. E. A. Orrigo,E. Pantic,R. Persiani,F. Piastra,J. Pienaar,G. Plante,N. Priel,S. Reichard,C. Reuter,A. Rizzo,S. Rosendahl,J. M. F. dos Santos,G. Sartorelli,S. Schindler,J. Schreiner,M. Schumann,L. Scotto Lavina,M. Selvi,P. Shagin,H. Simgen,A. Teymourian,D. Thers,A. Tiseni,G. Trinchero,O. Vitells,H. Wang,M. Weber,C. Weinheimer
Physics , 2014, DOI: 10.1103/PhysRevD.90.062009
Abstract: We present the first results of searches for axions and axion-like-particles with the XENON100 experiment. The axion-electron coupling constant, $g_{Ae}$, has been tested by exploiting the axio-electric effect in liquid xenon. A profile likelihood analysis of 224.6 live days $\times$ 34 kg exposure has shown no evidence for a signal. By rejecting $g_{Ae}$, larger than $7.7 \times 10^{-12}$ (90% CL) in the solar axion search, we set the best limit to date on this coupling. In the frame of the DFSZ and KSVZ models, we exclude QCD axions heavier than 0.3 eV/c$^2$ and 80 eV/c$^2$, respectively. For axion-like-particles, under the assumption that they constitute the whole abundance of dark matter in our galaxy, we constrain $g_{Ae}$, to be lower than $1 \times 10^{-12}$ (90% CL) for masses between 5 and 10 keV/c$^2$.
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