4,342 research outputs found

    Solar Neutrinos: Where We Are, What We Need

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    This talk compares standard model predictions with the results of solar neutrino experiments. Here `standard model' means the combined standard model of minimal electroweak theory plus a standard solar model. I emphasize the importance of recent analyses in which the neutrino fluxes are treated as free parameters, independent of any constraints from solar models, and the stunning agreement between the predictions of standard solar models and helioseismological measurements. In order to interpret solar neutrino experiments more accurately in terms of fundamental physics and astronomy, we need improved improved nuclear physics data. I describe the five most important nuclear physics problems whose solution is required for understanding the precise implications of solar neutrino experiments.Comment: 20 pages, RevTeX file. To appear in the Proceedings of the 15th International Conference on Few-Body Problems in Physics, Groningen, The Netherlands, 22--26 July 1997, ed. J. C. S. Bacelar, A. E. L. Dieperink, and R. A. Malfliet (Amsterdam: Elsevier Science Publishers). Related material at http://www.sns.ias.edu/~jn

    Solar Neutrinos

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    Experimental work with solar neutrinos has illuminated the properties of neutrinos and tested models of how the sun produces its energy. Three experiments continue to take data, and at least seven are in various stages of planning or construction. In this review, the current experimental status is summarized, and future directions explored with a focus on the effects of a non-zero theta-13 and the interesting possibility of directly testing the luminosity constraint. Such a confrontation at the few-percent level would provide a prediction of the solar irradiance tens of thousands of years in the future for comparison with the present-day irradiance. A model-independent analysis of existing low-energy data shows good agreement between the neutrino and electromagnetic luminosities at the +/- 20 % level.Comment: 16 pages, 8 figures. Proceedings of International School on Nuclear Physics; 27th Course: "Neutrinos in Cosmology, in Astro, Particle and Nuclear Physics" in Erice, Sicily, Italy; September 16 - 24, 2005. To be published in Progress Part. Nucl. Phy

    A Mixed Solar Core, Solar Neutrinos and Helioseismology

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    We consider a wide class of solar models with mixed core. Most of these models can be excluded as the predicted sound speed profile is in sharp disagreement with helioseismic constraints. All the remaining models predict 7^7Be and/or 7^7B neutrino fluxes at least as large as those of SSMs. In conclusion, helioseismology shows that a mixed solar core cannot account for the neutrino deficit implied by the current solar neutrino experiments.Comment: 6 pages, RevTeX, plus 5 postscript figure

    Present Status of the Theoretical Predictions for the ^(37)Cl Solar-Neutrino Experiment

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    The theoretical predictions for the ^(37)Cl solar-neutrino experiment are summarized and compared with the experimental results of Davis, Harmer, and Hoffman. Three important conclusions about the sun are shown to follow

    Potential for Precision Measurement of Solar Neutrino Luminosity by HERON

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    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

    Current Status of the Resonant Spin-Flavor Precession Solution to the Solar Neutrino Problem

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    We discuss the current status of the resonant spin-flavor precession (RSFP) solution to the solar neutrino problem. We perform a fit to all the latest solar neutrino data for various assumed magnetic field profiles in the sun. We show that the RSFP can account for all the solar neutrino experiments, giving as good fit as other alternative solutions such as MSW or Just so, and therefore can be a viable solution to the solar neutrino problemComment: RevTex file, 9 pages, 12 postscript figures, Some errors are corrected, some changes in results but no change in conclusions, version to appear in Astroparticle Physic
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