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Original Title
Die Suche nach Neutrino-Oszillationen mit dem KARMEN 2 Experiment
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2001 spring meeting of Fachverband Physik der Hadronen und Kerne (HK) of Deutsche Physikalische Gesellschaft e.V. (DGP) with physics and book exhibition; Fruehjahrstagung 2001 des Fachverbandes Physik der Hadronen und Kerne (HK) der Deutschen Physikalischen Gesellschaft e.V. (DPG) mit Physik- und Buchausstellung; Erlangen (Germany); 19-23 Mar 2001
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Journal Article
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Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195;
; CODEN VDPEAZ; v. 36(2); p. 20

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[en] The puma model on the basis of the Lorentz and CPT violation may bring an economical interpretation to the conventional neutrinos oscillation and part of the anomalous oscillations. We study the effect of the perturbation to the puma model. In the case of the first-order perturbation which keeps the (23) interchange symmetry, the mixing matrix element Ue3 is always zero. The nonzero mixing matrix element Ue3 is obtained in the second-order perturbation that breaks the (23) interchange symmetry. (authors)
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22 refs.; http://dx.doi.org/10.1088/0256-307X/29/4/041402
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Journal Article
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Chinese Physics Letters; ISSN 0256-307X;
; v. 29(4); [4 p.]

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[en] The LSND signal for ν-barμ→ν-bare oscillations has prompted supposition that there may be a fourth light neutrino or that CPT is violated. Neither explanation provides a good fit to all existing neutrino data. We examine the even more speculative possibility that a four-neutrino model with CPT violation can explain the LSND effect and remain consistent with all other data. We find that models with a 3+1 mass structure in the neutrino sector are viable; a 2+2 structure is permitted only in the antineutrino sector
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S0370269303015454; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
No abstract available
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Nuclear physics spring meeting 2002; Muenster (Germany); 11-15 Mar 2002
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Journal Article
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Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195;
; CODEN VDPEAZ; v. 37(3); p. 15

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Karagiorgi, Georgia S.
Fermi National Accelerator Laboratory, Batavia, IL (United States). Funding organisation: US Department of Energy (United States)2010
Fermi National Accelerator Laboratory, Batavia, IL (United States). Funding organisation: US Department of Energy (United States)2010
AbstractAbstract
[en] The MiniBooNE experiment was designed to perform a search for νμ → νe oscillations in a region of Δm2 and sin2 2θ very different from that allowed by standard, three-neutrino oscillations, as determined by solar and atmospheric neutrino experiments. This search was motivated by the LSND experimental observation of an excess of (bar ν)e events in a (bar ν)μ beam which was found compatible with two-neutrino oscillations at Δm2 ∼ 1 eV2 and sin2 2θ < 1%. If confirmed, such oscillation signature could be attributed to the existence of a light, mostly-sterile neutrino, containing small admixtures of weak neutrino eigenstates. In addition to a search for νμ → νe oscillations, MiniBooNE has also performed a search for (bar ν)μ → (bar ν)e oscillations, which provides a test of the LSND two-neutrino oscillation interpretation that is independent of CP or CPT violation assumptions. This dissertation presents the MiniBooNE νμ → νe and (bar ν)μ → (bar ν)e analyses and results, with emphasis on the latter. While the neutrino search excludes the two-neutrino oscillation interpretation of LSND at 98% C.L., the antineutrino search shows an excess of events which is in agreement with the two-neutrino (bar ν)μ → (bar ν)e oscillation interpretation of LSND, and excludes the no oscillations hypothesis at 96% C.L. Even though the neutrino and antineutrino oscillation results from MiniBooNE disagree under the single sterile neutrino oscillation hypothesis, a simple extension to the model to include additional sterile neutrino states and the possibility of CP violation allows for differences between neutrino and antineutrino oscillation signatures. In view of that, the viability of oscillation models with one or two sterile neutrinos is investigated in global fits to MiniBooNE and LSND data, with and without constraints from other oscillation experiments with similar sensitivities to those models. A general search for new physics scenarios which would lead to effective non-unitarity of the standard 3 x 3 neutrino mixing matrix, or mixing freedom, is also performed using neutrino and antineutrino data available from MiniBooNE.
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1 Jul 2010; 306 p; AC02-76CH03000; Available from http://lss.fnal.gov/cgi-bin/find_paper.pl?thesis-2010-39.pdf; PURL: https://www.osti.gov/servlets/purl/1000269-1F5G7k/; Submitted to Massachusetts Institute of Technology, Cambridge, MA (US); doi 10.2172/1000269; Thesis (Ph.D.)
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Miscellaneous
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AbstractAbstract
[en] The LSND experimental at Los Alamos has conducted a search for ν-barμ → ν-bare oscillations using ν-barμ from μ+ decay at rest. The ν-bare are detected via the reaction ν-barep → e+n, correlated with the 2.2-MeV γ from np → dγ. The use of tight cuts to identify e+ events with correlated γ rays yields 22 events with e+ energy between 36 and 60 MeV and only 4.6 ± 0.6 background events. The probability that this excess is due entirely to a statistical fluctuation is 4.1 x 10-8. A χ2 fit to the entire e+ sample results in a total excess of 51.8 +18.716.9 ±8.0 events with e+ energy between 20 and 60 MeV. If attributed to ν-barμ-bar → ν-bare oscillations, this corresponds to an oscillation probability (averaged over the experimental energy and spatial acceptance) of (0.31±0.12±0.05). (author)
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Stolarcyk, T. (CEA Saclay, 91 - Gif-sur-Yvette (France). Dept. d'Astrophysique, de la Physique des Particules, de la Physique Nucleaire et de l'Instrumentation Associee); Tran Thanh Van, J. (Paris-11 Univ., 91 - Orsay (France). Lab. de Physique Theorique et Hautes Energies); Vannucci, F. (Paris-6 Univ., 75 (France). Lab. de Physique Nucleaire et de Hautes Energies; Paris-7 Univ., 75 (France). Lab. de Physique Experimentale des Hautes Energies); 414 p; ISBN 2-86332-209-5;
; 1996; p. 67-74; 8. 'Neutrinos, dark matter and the universe'; Blois (France); 8-12 Jun 1996; 13 refs.

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Book
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Petrova, O. N.; Sinegovskaya, T. S.; Sinegovsky, S. I., E-mail: redponick@gmail.com, E-mail: tanya@api.isu.ru, E-mail: sinegovsky@api.isu.ru2012
AbstractAbstract
[en] A calculation of the atmospheric high-energy muon neutrino spectra and zenith-angle distributions is performed for two primary spectrum parameterizations (by Gaisser and Honda and by Zatsepin and Sokolskaya) with the use of QGSJET-II-03 and SIBYLL 2.1 hadronic models. A comparison of the zenith angle-averaged muon neutrino spectrum with the data of Frejus, AMANDA-II, and IceCube40 experiments makes it clear that, even at energies above 100 TeV, the prompt neutrino contribution is not apparent because of the considerable uncertainties of the experimental data in the high-energy region.
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Available from http://link.springer.com/openurl/pdf?id=doi:10.1134/S1547477112070138; Copyright (c) 2012 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Physics of Particles and Nuclei Letters (Print); ISSN 1547-4771;
; v. 9(9-10); p. 766-768

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AbstractAbstract
[en] The search for neutrino oscillations is the most sensitive method to probe whether neutrinos are massive. The Karlsruhe Rutherford Medium Energy Neutrino experiment searches for anti νμ→ anti νe oscillations in the appearance mode. Within data collected from February 1997 through March 2000, 11 candidate events have been reduced with an expected background of 12.3 ± 0.3 events. Including spectral information, an oscillation probability of P(anti νμ→ anti νe)>0.65 x 10-3 for large neutrino mass differences is excluded at 90% confidence. This result is in contrast to the reported evidence by the Los Alamos LSND experiment. We introduce the phenomenon and experimental status of neutrino oscillations, present the KARMEN experimental configuration and physical results and discuss their implications on the LSND evidence. (orig.)
Original Title
Sind Neutrinos massebehaftet? - Die Suche nach Neutrino-Oszillationen mit KARMEN
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Journal Article
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Nachrichten - Forschungszentrum Karlsruhe; ISSN 0948-0919;
; v. 33(2); p. 135-147

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[en] KARMEN, the Karlsruhe-Rutherford Medium Energy Neutrinoexperiment at the pulsed spallation neutron facility ISIS uses the beam stop neutrinos νμ, νe and anti νμ from π+ and μ+ decay at r search for neutrino oscillations in the appearance channels anti νμ → anti νe and anti νμ → anti νe. The signature for both oscillations is based on charged current neutrino nuclear interaction spectroscopy in a high resolution 56t liquid scintillator calorimeter. This report describes the results based on data acquired from June 1990 to August 1995. (orig.)
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Enqvist, K.; Huitu, K.; Maalampi, J. (Helsinki Univ. (Finland)) (eds.); 600 p; ISBN 981-02-3177-6;
; 1997; p. 193-202; 17. international conference on neutrino physics and astrophysics; Helsinki (Finland); 13-19 Jun 1996

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Book
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[en] Do neutrinos play a central role in the understanding of the differences between matter and antimatter? New results of an experiment in Japan confirm the suspicion.
Original Title
Neutrinooszillation. Kosmische Anomalie im Wassertank
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