Bulletin of the American Physical Society
2006 73rd Annual Meeting of the Southeastern Section of the APS
Thursday–Saturday, November 9–11, 2006; Williamsburg, Virginia
Session GA: Recent Advances in Neutrino Physics |
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Chair: Jeffrey Nelson, College of William & Mary Room: Williamsburg Hospitality House Empire A/B |
Friday, November 10, 2006 8:00AM - 8:30AM |
GA.00001: Results from the first year MINOS operations in the NuMI beam Invited Speaker: After a brief review of the current neutrino oscillation status, we present results from the MINOS experiment based on its initial exposure to neutrinos from the Fermilab NuMI beam. The rates and energy spectra of charged current muon neutrino interactions are compared in two detectors located along the beam axis at distances of 1 km and 735 km. With 1.2710$^20$ 120 GeV protons incident on the NuMI target, 215 events with energies below 30 GeV are observed at the Far Detector, compared to an expectation of 336 with an error in the expectation of 14.4 events. The data are consistent with muon neutrino disappearance via two-flavor oscillations with $\Delta m^2_{23}=2.74^{+0.44}_{-0.26}\times10^{-3}$ eV$^2$ and sin$^2(2\theta_{23})> 0.87$ (68\% C.L.). [Preview Abstract] |
Friday, November 10, 2006 8:30AM - 9:00AM |
GA.00002: Measuring the Solar Neutrino Spectrum Invited Speaker: Efforts to measure the solar neutrinos spectra have already proven to be very rewarding. Neutrino oscillations have been definitely observed in the higher energy part of the spectra, and, coupled with the MSW mechanism, can explain the integral lower-energy flux measurements to date. However, there is still no direct signature that MSW oscillations are indeed the full explanation. Also, the luminosity of the Sun, as determined by its emitted photon flux, compared to its luminosity as determined by neutrino measurements, still differ by 20 to 40\% at one sigma. There could be seveal reasons for this: theta-13 is non-zero, there are other sources of energy in the Sun, the photons coming from the surface of the Sun reflect an older Sun than seen with neutrinos produced only minutes ago, or perhaps some entirely new phenomena. Thus, current experiments to measure the 7Be neutrino flux, in the middle of the solar spectra, are of major importance. This talk will describe the progress to date of the Borexino and KamLAND experiments designed to measure this flux. Likewise, acurately measureing the pp-neutrino flux, over 90\% of the total flux from the Sun, still remains to be done. This talk will describe the upcoming experiments designed to meet this challenge and what we can expect to learn. [Preview Abstract] |
Friday, November 10, 2006 9:00AM - 9:30AM |
GA.00003: Recent Results form the MiniBooNE Experiment Invited Speaker: The MiniBooNE experiment was designed to test the unconfirmed, large $\Delta m^2$ neutrino oscillation signal reported by the LSND experiment. MiniBooNE has been taking data since late 2001 and it now has the world's largest data set of GeV energy neutrino interactions. In addition to neutrino oscillations MiniBooNE is expected to produce ground breaking results in neutrino and anti-neutrino cross sections. I will discuss the latest results from MiniBooNE. [Preview Abstract] |
Friday, November 10, 2006 9:30AM - 10:00AM |
GA.00004: Next Generation Neutrinoless Double Beta-Decay: Probing Majorana Neutrino Masses Below the 100 meV Level Invited Speaker: Neutrinolesss double beta-decay is a unique tool for probing the absolute mass of neutrinos and determining whether the neutrino is a Dirac or Majorana particle. Neutrino oscillations experiments have established several possible scenarios for the heirarchy of neutrino masses. We present ongoing and planned double beta-decay experiments and their potential impact on our understanding of these mass heirarchy scenarios. [Preview Abstract] |
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