701 research outputs found
Detecting the (Quasi-)Two-Body Decays of Leptons in Short-Baseline Neutrino Oscillation Experiments
Novel detector schemes are proposed for the short-baseline neutrino
experiments of next generation, aimed at exploring the large-
domain of \omutau oscillations in the appearance mode. These schemes emphasize
good spectrometry for charged particles and for electromagnetic showers and
efficient reconstruction of \ypi_gg decays. The basic elements are a sequence
of relatively thin emulsion targets, immersed in magnetic field and
interspersed with electronic trackers, and a fine-grained electromagnetic
calorimeter built of lead glass. These elements act as an integral whole in
reconstructing the electromagnetic showers. This conceptual scheme shows good
performance in identifying the (quasi-)two-body decays by their
characteristic kinematics and in selecting the electronic decays of the .Comment: 34 pages, 8 figure
Teleconference in support of distance learning: Views of educators
In this study we recorded the views of the educators that use teleconference as an educational medium to support distance learning. The data were collected using the semi-structured interview and the results showed that teleconferencing could be a strong complementary tool to support flexible learning as well as distance education, by enhancing the interaction among learners. All the interviewees consider teleconference as a "helpful assistant" in the educational process and suggested that the educators should be well prepared before the tele-lecture, as well as prepare and guide the learners in order to conduct a smooth teleconferencing session. From the interviews, several advantages and disadvantages of the teleconference’s use as an educational tool emerged. The main advantages consist of the independence of spaceand time while conducting learning sessions, the easy access to and sharing of educational content, the interaction between educator and learners as well as among the learners and the reduced transportations along with time saving. On the other hand, some important disadvantages refer to the participants being unfamiliar with technology, lack of technological support, limited network resources causing disconnections and adding stress to participants, the uncertainty of the participantsregarding the effectiveness of teleconference in education and the lack of face-to-face communication
A first measurement of the interaction cross section of the tau neutrino
The DONuT experiment collected data in 1997 and published first results in
2000 based on four observed charged-current (CC) interactions. The
final analysis of the data collected in the experiment is presented in this
paper, based on protons on target using the 800 GeV
Tevatron beam at Fermilab. The number of observed CC interactions is
9, from a total of 578 observed neutrino interactions. We calculated the
energy-independent part of the tau-neutrino CC cross section (), relative to the well-known and cross sections. The
ratio / was found to be
. The CC cross section was found to be cm. Both results are in
agreement the Standard Model.Comment: 37 pages, 15 figure
A New Upper Limit for the Tau-Neutrino Magnetic Moment
Using a prompt neutrino beam in which a nu_tau component was identified for
the first time, the nu_tau magnetic moment was measured based on a search for
an anomalous increase in the number of neutrino-electron interactions. One such
event was observed when 2.3 were expected from background processes, giving an
upper 90% confidence limit of 3.9x10^-7 Bohr magnetons.Comment: 9 pages; 1 figur
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