Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session E9: Neutrino Astronomy |
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Sponsoring Units: DAP DPF Chair: Steven Barwick, University of California-Irvine Room: Marriott Tampa Waterside Room 5 |
Saturday, April 16, 2005 3:30PM - 3:42PM |
E9.00001: Search for Extremely High Energy Neutrinos with AMANDA-II Lisa Gerhardt AMANDA-II is a large volume neutrino telescope, designed to measure the energetic neutrino flux from astrophysical sources. A search for neutrinos exceeding 1 PeV has been performed using data collected by AMANDA-II in 2000. At these energies, the Earth is opaque to neutrinos. This, combined with the limited overburden above the detector, concentrates the expected signal at the horizon. A method of separatingsignal from the background of high energy downward going air showers has been developed and the results are discussed. [Preview Abstract] |
Saturday, April 16, 2005 3:42PM - 3:54PM |
E9.00002: Search for extraterrestrial point sources of high energy neutrinos with AMANDA-II using data collected in 2000-2002 You-Ren Wang, Paolo Desiati The results of a search for point sources of high energy neutrinos in the northern hemisphere using data collected by AMANDA-II in the years 2000, 2001 and 2002 are presented. In particular, a comparison with the single-year result previously published shows that the sensitivity was improved by a factor of 2.2. The muon neutrino flux upper limits on selected candidate sources, corresponding to an E$^{-2}$ neutrino energy spectrum, are included. Sky grids were used to search for possible excesses above the background of cosmic ray induced atmospheric neutrinos. This search reveals no statistically significant excess for the three years considered. [Preview Abstract] |
Saturday, April 16, 2005 3:54PM - 4:06PM |
E9.00003: The Search for Neutrinos from Gamma-Ray Bursts with AMANDA Kyler Kuehn The second stage of the Antarctic Muon and Neutrino Detector Array (AMANDA-II), has been searching for signals from atmospheric and astrophysical neutrinos since February of 2000. High energy phenomena such as gamma-ray bursts (GRBs) are among the most promising potential sources of such astrophysical neutrinos; by correlating observations with other ground- and satellite-based detectors, AMANDA is able to engage in nearly background-free searches for neutrinos from several dozen GRBs every year. We present here the results of the search for GRBs from 2000-2003, which includes many of the bursts localized by the InterPlanetary Network of satellites. We also present a comparison of observational results to prominent theories of GRB neutrino emission, and the status of future GRB searches is briefly described. [Preview Abstract] |
Saturday, April 16, 2005 4:06PM - 4:18PM |
E9.00004: RICE bounds on cosmogenic neutrino fluxes and interactions Shahid Hussain, Douglas McKay Assuming standard model interactions we calculate shower rates induced by cosmogenic neutrinos in ice, and we bound the cosmogenic neutrino fluxes using RICE 2000-2004 results. Next we assume new interactions due to extra- dimensional, low-scale gravity (i.e. black hole production and decay; graviton mediated deep inelastic scattering) and calculate enhanced shower rates induced by cosmogenic neutrinos in ice. With the help of RICE 2000-2004 results, we survey bounds on low scale gravity parameters for a range of cosmogenic neutrino flux models. [Preview Abstract] |
Saturday, April 16, 2005 4:18PM - 4:30PM |
E9.00005: Exposing Supernovae with Neutrinos Hasan Yuksel The last galactic supernova occurred in the Large Magellanic Cloud in 1987 and was observed not only with photon signal, but also with neutrinos preceding the light, confirming our basic understanding of mechanism behind the explosion. Galactic supernovae are so rare that one should not expect to witness more than one in his/her lifetime. Yet they provide information on neutrino spectra and luminosities, which are crucial diagnostics of a successful explosion. In this perspective, the development of strategies to circumvent the difficulty of waiting for infrequent galactic supernovae, and providing the astronomical community with a prompt alert in case it strikes, are essential. (Based on collaborative work with S. Ando, A.B. Balantekin, J.F. Beacom.) [Preview Abstract] |
Saturday, April 16, 2005 4:30PM - 4:42PM |
E9.00006: Ultrahigh energy tau neutrinos: propagation and tau energy loss Mary Hall Reno, Sharada Iyer Dutta, Yiwen Huang Astrophysical sources of ultrahigh energy cosmic rays may also be sources of ultrahigh energy neutrinos, including tau neutrinos from $\nu_\mu\rightarrow \nu_\tau$ oscillations over astrophysical distances. A mountain or small column depth of Earth acts as a neutrino converter for $\nu_\tau\rightarrow \tau$, and a tau decay in the atmosphere, after it has emerged from the Earth, produces an air shower. We evaluate $\nu_\tau$ and $\tau$ propagation through 10-100 km of rock using a stochastic evaluation of $\nu_\tau\rightarrow \tau$ conversion and tau electromagnetic energy loss. We compare our results with the analytic approaches commonly used to estimate air shower event rates. We find that the analytic approach typically does well only for $E_\tau<10^{10}$ GeV. We discuss the implications for recent analytic evaluations of shower event rates. [Preview Abstract] |
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