Prof.
David Saltzberg
(University of California, Los Angeles)
04/05/2015, 15:30
Cosmic Rays (Theory / Experiment)
Cascades from high-energy particles produce a brief current and associated magnetic fields. Even sub-nanosecond duration magnetic fields can be detected with a relatively low bandwidth system by latching image currents on a capacitor. At accelerators, this technique is employed routinely by beam-current monitors, which work for pulses even as fast as femtoseconds. We discuss scaling up these...
Krijn de Vries
(VUB/IIHE)
04/05/2015, 15:45
Cosmic Rays (Theory / Experiment)
Recently it has been shown that the radio detection technique can be used as a new and complementary detection method for the detection of high-energy cosmic-ray-induced air showers. Along with the detection of the radio emission from air showers, it is shown that the emission can be predicted in great detail establishing the radio emission models. A cosmic-ray air shower hitting a surface,...
Frank McNally
(IceCube)
04/05/2015, 16:00
Cosmic Rays (Theory / Experiment)
We provide an update on the continued observation of anisotropy in the arrival direction distribution of cosmic rays in the southern hemisphere. The IceCube neutrino observatory recorded more than 250 billion events between May 2009 and May 2014. Subtracting dipole and quadrupole fit maps, we can use these increased statistics to see significant small-scale structure that approaches our median...
Martin Pohl
(DESY)
04/05/2015, 16:15
Cosmic Rays (Theory / Experiment)
The anisotropy in cosmic-ray arrival directions in the TeV-PeV energy range shows both large and small-scale structures. While the large-scale anisotropy may arise from diffusive propagation of cosmic rays, the origin of the small-scale structures remains unclear. We perform three-dimensional Monte-Carlo test-particle simulations, in which the particles propagate in both magnetostatic and...
Shirley Li
(The Ohio State University)
04/05/2015, 16:30
Cosmic Rays (Theory / Experiment)
High energy cosmic ray muons not only are backgrounds for high energy astrophysical neutrinos, they also produce serious background for low energy neutrino searches. When muons interact in detectors, their energy losses lead to nuclear breakup (“spallation”) processes. The subsequent beta decays of unstable daughter nuclei mimic MeV neutrino signals. This background has been understudied in...
Prof.
Mary Hall Reno
(University of Iowa)
05/05/2015, 14:00
Cosmic Rays (Theory / Experiment)
The high energy atmospheric neutrino flux is dominated by charm production by cosmic ray interactions in the atmosphere, followed by their prompt decays. Using next-to-leading order QCD and several cosmic ray flux parameterizations, the prompt atmospheric neutrino flux is discussed, along with uncertainties associated with the perturbative evaluation.
Anatoli Fedynitch
(CERN/KIT)
05/05/2015, 14:23
Cosmic Rays (Theory / Experiment)
The precision of atmospheric lepton flux calculations is limited by various factors. One source of uncertainty is the parameterization of the primary cosmic ray flux. Typically, calculations are performed for a single atmospheric profile, approximating either a global atmosphere or one specific location. The control of uncertainties arising from hadronic interaction models is the most...
Luis Anchordoqui
(City University of New York)
05/05/2015, 14:46
Cosmic Rays (Theory / Experiment)
The sharp change in slope of the ultra-high energy cosmic ray (UHECR) spectrum around 10^9.6 GeV (the ankle), combined with evidence of a light but extragalactic component near and below the ankle and intermediate composition above, has proved exceedingly challenging to understand theoretically. We propose a mechanism whereby photo-disintegration of ultra-high energy nuclei in the region...
Dr
Brian Lacki
(Institute for Advanced Study)
05/05/2015, 15:09
Cosmic Rays (Theory / Experiment)
Star-forming galaxies (SFGs) are among the most numerous extragalactic sources. I describe my results in calculating the extragalactic radiation from SFGs at all energies. I construct very simple models of galaxies using empirical relations like the Schmidt law to estimate the properties of galaxies, and then use basic one-zone models of radiative transfer to calculate the stellar, dust,...
