10,363 research outputs found
Preliminary results of the AMIGA engineering array at the Pierre Auger Observatory
The Auger Muons and Infill for the Ground Array (AMIGA) aims to both extend
the detection range of the Pierre Auger Observatory down to energies and to measure the muon content of extensive air
showers. To accomplish these goals, its detection system is composed of an
array of coupled water-Cherenkov and scintillation detectors deployed in a
graded triangular grid of 433 and 750\,m spacings. At each position, the
scintillation detector is buried deep so as to shield it from
the air shower electromagnetic component and thus only measure the muon
component. These muon detectors have area split into modules,
each of them highly segmented in 64 plastic-scintillator strips with an
embedded wavelength-shifter optical fiber to transport light to an optical
sensor located at the center of the module. During the engineering array phase
(finished in November 2017) two module areas ( and
) and two optical sensors (photo-multiplier tubes and
silicon-photomultipliers) were tested. In this work, we present the final
performance of the muon detectors equipped with silicon-photomultipliers which
were thereafter selected as the baseline design for the AMIGA production phase.
Analyses and results are based both on laboratory and field measurements.Comment: Proceeding of the UHECR 2018 conference, submitted to the forthcoming
EPJ Web of Conference
A New Record of Scaphytopius Magdalensis: Another Plant Disease Vector in Michigan (Homoptera: Cicadellidae)
Excerpt: Several specimens of Scaphytopius magdalensis (Provancher) were collected by Burger (1966), and brought to the attention of the senior author for verification. This leafhopper, a vector of Blueberry Stunt, is widely distributed in the eastern United States, and southern Ontario and Quebec. This, the first record of a leafhopper virus vector for blueberries in Michigan, increases the list of leafhopper vectors of plant diseases in the state , given in Taboada and Hoffman (1965). to 14
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