Potential for Precision Measurement of Solar Neutrino Luminosity by HERON

Results are presented for a simulation carried out to test the precision with which a detector design (HERON) based on a superfluid helium target material should be able to measure the solar pp and Be7 fluxes. It is found that precisions of +/- 1.68% and +/- 2.97% for pp and Be7 fluxes, respectively, should be achievable in a 5-year data sample. The physics motivation to aim for these precisions is outlined as are the detector design, the methods used in the simulation and sensitivity to solar orbit eccentricity.Comment: 15 pages, 11 figure

Rayleigh Scattering in Rare Gas Liquids

The Rayleigh scattering length has been calculated for rare-gas liquids in the ultraviolet for the frequencies at which they luminesce. The calculations are based on the measured dielectric constants in the gas phase, except in the case of xenon for which measurements are available in the liquid. The scattering length mayplace constraints on the design of some large-scale detectors, using uv luminescence, being proposed to observe solar neutrinos and dark matter. Rayleigh scattering in mixtures of rare-gas mixtures is also discussed.Comment: 8 pages, 4 tables; This version corrects erratum in table and has expanded discussion in Section II. Accepred for publication in NIM

Solar Neutrinos with Three Flavor Mixings

The recent 71Ga solar neutrino observation is combined with the 37Cl and Kamiokande-II observations in an analysis for neutrino masses and mixings. The allowed parameter region is found for matter enhanced mixings among all three neutrino flavors. Distortions of the solar neutrino spectrum unique to three flavors are possible and may be observed in continuing and next generation experiments.Comment: August 1992 (Revised) PURD-TH-92-

Solar Neutrinos: What We Have Learned

The four operating solar neutrino experiments confirm the hypothesis that the energy source for solar luminosity is hydrogen fusion. However, the measured rate for each of the four solar neutrino experiments differs significantly (by factors of 2.0 to 3.5) from the corresponding theoretical prediction that is based upon the standard solar model and the simplest version of the standard electroweak theory. If standard electroweak theory is correct, the energy spectrum for \b8 neutrinos created in the solar interior must be the same (to one part in $10^5$) as the known laboratory \b8 neutrino energy spectrum. Direct comparison of the chlorine and the Kamiokande experiments, both sensitive to \b8 neutrinos, suggests that the discrepancy between theory and observations depends upon neutrino energy, in conflict with standard expectations. Monte Carlo studies with 1000 implementations of the standard solar model confirm that the chlorine and the Kamiokande experiments cannot be reconciled unless new weak interaction physics changes the shape of the \b8 neutrino energy spectrum. The results of the two gallium solar neutrino experiments strengthen the conclusion that new physics is required and help determine a relatively small allowed region for the MSW neutrino parameters.Comment: LaTeX file, 19 pages. For hardcopy with figures contact [email protected]. Institute for Advanced Study number AST 93/6

Supernova Observation Via Neutrino-Nucleus Elastic Scattering in the CLEAN Detector

Development of large mass detectors for low-energy neutrinos and dark matter may allow supernova detection via neutrino-nucleus elastic scattering. An elastic-scattering detector could observe a few, or more, events per ton for a galactic supernova at 10 kpc ($3.1 \times 10^{20}$ m). This large yield, a factor of at least 20 greater than that for existing light-water detectors, arises because of the very large coherent cross section and the sensitivity to all flavors of neutrinos and antineutrinos. An elastic scattering detector can provide important information on the flux and spectrum of $\nu_\mu$ and $\nu_\tau$ from supernovae. We consider many detectors and a range of target materials from $^4$He to $^{208}$Pb. Monte Carlo simulations of low-energy backgrounds are presented for the liquid-neon-based Cryogenic Low Energy Astrophysics with Noble gases (CLEAN) detector. The simulated background is much smaller than the expected signal from a galactic supernova.Comment: 10 pages, 5 figures, submitted to Phys. Rev.

Research program in experimental high energy physics. Task C. Progress report, January 1, 1979-December 31, 1979. [Summaries of research activities at Brown Univ]

An experimental program in strong and weak interaction physics of elementary particles is being carried out using electronic detection techniques. Experiments have been performed or have been proposed utilizing the accelerators of the laboratories at Brookhaven, Fermilab, LAMPF, and SLAC. The experiments described by the Electronic Detector Group include the following: an analysis of resonances in the proton-antiproton system, a study of inclusive scattering in hadron reactions of the form a + p(n) ..-->.. b + X, where a and b can be ..pi..+-, K+-, p+- in any combination at incident momenta up to 175 GeV/c, an experiment to measure neutrino-electron and other neutral current phenomena at the BNL-AGS, and development of a muon polarimeter and proposals for its use in further experiments. A list of publications is included

Progress report of a research program in experimental high energy physics, September 1, 1976--December 31, 1977. [Summaries of research activities at Brown Univ]

Experimental research in high energy physics is summarized. A list of publications is included. (JFP

Progress report of a research program in experimental high energy physics, 1 September 1974--31 August 1975

El grupo el Comercio S.A es una empresa que se dedica a la edición, publicación y distribución de libros, revistas, folletos, diarios, semanarios y todo tipo de publicaciones gráficas; a la producción y distribución de noticias, de servicios informativos y de entretenimiento en cualquiera de sus formas y a través de cualquier medio de comunicación, así como canaliza sus inversiones a medios de comunicación radiales, televisivos o similares. También se dedica a las actividades de transmisión y radiodifusión de datos; al desarrollo y comercialización de programas de computación; al desarrollo y comercialización de programas y/o productos de multimedia e interactivos en general; a la comercialización e instalación de infraestructura, equipos, redes y demás facilidades de telecomunicaciones e informática; a la representación y comercialización de productos y servicios de telecomunicaciones e informática de terceros; y a la prestación de servicios de capacitación, adiestramiento, soporte técnico, mantenimiento y asesoría en el campo de la informática y de las comunicaciones. En la actualidad El Grupo el Comercio presenta problemas en la información ya que no está centralizado el monitoreo de Programación de anuncios es decir que en ocasiones usuarios que pagan el servicio de publicidad web no son atendidos en su requerimiento ya que como se menciona hay una deficiencia en la programación por ello en los casos puntuales para la solución del problema el personal encargado hace una revisión en la programación en la fecha que ingresa el pago y una vez ingresado el reclamo por la demora en su anuncio el personal encargado verifica los detalles del anuncio y proceden a enviar su publicación lo antes posible para evitar mayores percances ello ocasiona un retraso en las programaciones actuales e insuficiente de información para la generación de reportes estadísticos. Después de ser observado y analizado mediante un estudio, no se cumple con las necesidades que la institución requiere para su normal desarrollo y atención por lo que se opta por realizar un sistema de ventas de publicidad y facturación web por ello el presente proyecto da solución al problema descrito.Trabajo de investigació