Conveners
Experiments above the Ankle: 1
- Dietrich Muller (University of Chicago)
Experiments above the Ankle: 2
- Dietrich Muller (University of Chicago)
Experiments above the Ankle: 3
- Jean-Noel Capdevielle (CNRS)
Prof.
Pierre Sokolsky
(University of Utah)
01/07/2010, 09:30
Experiments above the Ankle
Invited
Final results from the HiRes experiment on the spectrum, composition and anisotropy of ultra-high energy cosmic rays will be presented. Stereo and monocular data analysis will be described. The HiRes experiment has observed the Greisen-Zatsepin-Kuzmin cutoff. This analysis and evidence for a light composition of cosmic rays to the highest energies will be presented. Recent results on...
Prof.
Paolo Privitera
(University of Chicago)
01/07/2010, 10:35
Experiments above the Ankle
Invited
The Pierre Auger Observatory in the southern site of Mendoza, Argentina is the largest cosmic ray detector ever built. Since its completion in 2008, the Observatory is steadily taking data with 3000 km**2 of active detection area, accumulating an unprecedented statistics of high quality events. Results are presented on the energy spectrum of cosmic rays from 10**18 eV to the highest energy,...
Prof.
Masaki Fukushima
(ICRR, Univ. Tokyo)
01/07/2010, 11:10
Experiments above the Ankle
Invited
The Telescope Array (TA) experiment, located in the west desert of Utah, USA, observes ultra-high energy cosmic rays (UHECRs) with energies above 10^18.5 eV. TA employs a surface detector (SD) array and 3 batteries of fluorescence detectors (FDs) to measure extensive air showers. The direction and the energy of incoming cosmic rays are measured by both detectors, and the results can be cross...
Prof.
Charles Jui
(University of Utah)
01/07/2010, 11:35
Experiments above the Ankle
Contributed
The Telescope Array (TA) experiment is the largest cosmic ray detector in
the northern hemisphere. It also operates the largest scintillation counter
array in the world. Together with the three fluorescence detectors (FDs),
it is optimized to study cosmic rays as independent detectors and in hybrid
mode at energies above the ankle structure. The TA low energy extension
will add two...
Mr
Dmitri Ivanov
(Rutgers University)
01/07/2010, 11:50
Experiments above the Ankle
Contributed
Abstract: The Telescope Array experiment is the largest cosmic ray experiment in the northern hemisphere. It consists of a surface detector (SD) of 507 scintillation counters and three fluorescence stations overlooking the SD. We develop new techniques for estimating cosmic ray energies and calculating the aperture for TA SD which utilize an accurate CORSIKA Monte Carlo (MC) simulation of...
Dr
Stanislav Knurenko
(Yu. G. Shafer Institute of cosmophysical research and aeronomy, SB RAS)
01/07/2010, 12:05
Experiments above the Ankle
Contributed
For a long time the three main components of extensive air showers have been measured at
the Yakutsk array: the whole charged component, muons with e_{th} \ge 1 GeV and Cherenkov
light. Using these data we reconstruct energy of primary cosmic particle (with
quasi-colorimetric method), estimate the depth of shower maximum (by the shape of charged
particles lateral distribution and a pulse...
Dr
Stanislav Knurenko
(Yu. G. Shafer Institute of cosmophysical research and aeronomy, SB RAS)
01/07/2010, 13:20
Experiments above the Ankle
Contributed
We present a new data on Cherenkov light observations obtained during 1994-2009 period,
after a modernization of the Yakutsk EAS array. A complex analysis of x_{max} and its
fluctuations \sigma(x_{max}) was performed in a wide energy range. With the new data,
accord-
ing to QGSJet II model, an estimation was made of cosmic rays mass composition for E_0
\sim 10^{17} - 3 \times 10^{19} eV....
Mr
Christopher Williams
(University of Chicago)
01/07/2010, 13:35
Experiments above the Ankle
Contributed
Recent measurements suggest free electrons created in ultra-high energy cosmic ray extensive air showers (EAS) can interact with neutral air molecules producing Bremsstrahlung radiation in the microwave regime. The microwave radiation produced is expected to scale with the number of free electrons in the shower, which itself is a function of the energy of the primary particle and atmospheric...
Dr
Frederick Kuehn
(Fermilab)
01/07/2010, 13:50
Experiments above the Ankle
Contributed
We present preliminary results from the most recent data on the absolute
yield of fluorescence photons in atmospheric gases by the AIRFLY
collaboration. Currently, the uncertainty in the yield forms the dominant contribution to
the systematic uncertainty in the Pierre Auger Observatory's energy
spectrum, and are at the level of 10%. Data were taken in 2009 and 2010 at
the test beam...