Results 1 - 10 of 13612
Results 1 - 10 of 13612. Search took: 0.027 seconds
|Sort by: date | relevance|
[en] A detailed examination of current data on S17 (as opposed to an examination of S17(0) only) excludes quoting S17(0) with sufficiently small uncertainty. In contrast to suggestions that S17(0) is now known with the accuracy of +/-3%, the exact value of S17(0) is dependent on the choice of the data and the choice of theory used for extrapolation. In addition recent high precision results (including the Seattle data) on S17 which are in good agreement, still differ on the measured slopes, as do theoretical models that predict different d-wave contribution, precluding an accurate extrapolation to zero energy of the consistent data. Using a common extrapolation of only the consistent high precision data, suggests a value of S17(0)=21.2+/-0.5 eV-b, but a value equal to or smaller than 19.0 eV-b can not be excluded due to the uncertainty in the extrapolation, leading to an additional error of -3.0+0.0 eV-b. This (unacceptable) situation must be cleared by future experiments
[en] The Majorana experiment[nucl-ex/0311013] is a proposed 76Ge-based search for neutrinoless double-beta (0νββ) decay and dark matter (DM). It will use segmented, enriched germanium detectors in a close-pack configuration. With 500 kg of germanium, Majorana would be expected to reach a sensitivity to the 0νββ decay half-life of 1027 years, corresponding to a neutrino mass near the atmospheric mass scale. Current development efforts are presented, along with performance expectations and background reduction methods. Additionally, the status of the related detectors SEGA (Segmented Enriched Germanium Assembly) and MEGA [Kazkaz, K., Aalseth, C.E., Hossbach, T.W., Gehman, V.M., Kephart, J.D., Miley, H.S., IEEE Trans. Nuc. Sci. 51 (2004) 1029] (Multi-Element Gamma Assay) are presented. Current simulation efforts will be presented in a parallel poster by Reyco Henning
[en] This paper describes the forthcoming enlargement of the Canfranc Underground Laboratory (LSC) which will allow to host new international Astroparticle Physics experiments and therefore to broaden the European underground research area. The new Canfranc Underground Laboratory will operate in coordination (through the ILIAS Project) with the Gran Sasso (Italy), Modane (France) and Boulby (UK) underground laboratories
[en] A model of neutrino oscillations is presented that has only three degrees of freedom and is consistent with existing data. The model is a subset of the renormalizable sector of the Standard-Model Extension (SME), and it offers an alternative to the standard three-neutrino massive model. All classes of neutrino data are described, including solar, reactor, atmospheric, and LSND oscillations. The disappearance of solar neutrinos is obtained without matter-enhanced oscillations. Quantitative predictions are offered for the ongoing MiniBooNE experiment and for the future experiments OscSNS, NOVA, and T2K.
[en] The flux is a necessary ingredient to measure the cross section in the near detector. This document briefly describes how to extract the neutrino flux in NuMI (Neutrinos at Main Injector) beams.
[en] Borexino is a massive calorimetric liquid scintillation detector whose installation has been completed in the underground Gran Sasso Laboratory. The focus of the experiment is on the direct and real time measurement of the flux of neutrinos produced in the 7Be electron capture reaction in the Sun. Furthermore, recent studies about the reduction of the 11C background through suitable rejection techniques demonstrated the possibility to open an interesting additional observation window in the energy region of the pep and CNO solar neutrinos. Beyond the solar neutrino program, the detector will be also a powerful observatory for antineutrinos from Supernovae, as well as for geoneutrinos, profiting from a very low background from nuclear reactors.
[en] In the framework of the bolometric experiment CUORE, a new and promising technique has been developed in order to control the dangerous contamination coming from the surfaces close to the detector. In fact, by means of a composite bolometer, it is possible to partially overcome the loss of spatial resolution of the bolometer itself and to clearly identify events coming from outside.
[en] We present a rather powerful method in investigations of different phenomena that can appear when neutrinos and electrons propagate in background matter. This method is based on the use of the modified Dirac equations for particles wave functions, in which the correspondent effective potentials accounting for the matter influence on particles are included.
[en] Results obtained by the H1 collaboration in deep-inelastic e+p scattering up to 4-momentum transfers Q2 up to 35000 GeV2 are presented. At Q2 > 15000 GeV2 12 events are observed in neutral current (NC) interactions, where only 4.71±0.76 events are expected. In charged current (CC) interactions in the same range of Q2 4 events are observed, while the standard expectation is 1.77±0.87 events. (orig.)