Difference: NevisSeminars (36 vs. 37)

Revision 372015-10-01 - WilliamSeligman

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Nevis Seminars

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In reverse chronological order (most recent at the top).

Fall 2015

Date Time Speaker Title Description
Friday October 9 1pm Henrike Fleischhack, DESY Towards a measurement of the iron spectrum in cosmic rays with VERITAS Measuring the element-dependent energy spectra of cosmic rays plays an important role in understanding their acceleration and propagation. Most current results are obtained either from direct measurements by balloon- or satellite-borne detectors, or from indirect measurements by air shower detector arrays on the Earth’s surface. Imaging Atmospheric Cherenkov Telescopes (IACTs), used primarily for γ-ray astronomy, can also be used for cosmic-ray physics. They are able to measure Cherenkov light emitted both by heavy nuclei and by secondary particles produced in air showers, and are thus sensitive to the charge and energy of cosmic ray particles with energies of tens to hundreds of TeV.

In this talk, a likelihood method will be presented which improves the reconstruction of iron-induced air showers, as well as the suppression of backgrounds from lighter elements.

Summer 2015

Date Time Speaker Title Description
Friday July 10 1pm Jordon Myslik, University of Victoria in Canada Neutrino Oscillations at T2K Since first being proposed to explain a dramatic difference between theoretical expectations and experimental observations, neutrinos have managed to maintain their mysterious reputation. The phenomenon of neutrino oscillation, where a neutrino of one flavor is observed to have changed into another while in transit, has been an area of intense experimental scrutiny. The T2K ("Tokai to Kamioka") experiment is a long-baseline neutrino oscillation experiment in Japan. A beam of muon neutrinos or muon antineutrinos is produced at the Japan Proton Accelerator Research Complex (J-PARC) in Tokai. The unoscillated neutrino flux is measured by the near detector complex 280 m from the proton target, and the oscillated neutrino flux is measured by the far detector, Super-Kamiokande, 295 km away. Using a beam of muon neutrinos, T2K has performed precise measurements of muon neutrino disappearance, and discovered muon neutrino to electron neutrino oscillation by measuring electron neutrino appearance. Since the summer of 2014, T2K has been taking data using a beam of muon antineutrinos, and has recently released its first result using antineutrino beam mode data: a muon antineutrino disappearance measurement. This talk will discuss these neutrino oscillation results, and using the recent muon antineutrino disappearance measurement as an example, give an overview of what goes into a T2K neutrino oscillation measurement.
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