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Constraints on the flux of Ultra-High Energy neutrinos from WSRT observations

Description: Context. Ultra-high energy (UHE) neutrinos and cosmic rays initiate particle cascades underneath theMoon?s surface. These cascades have a negative charge excess and radiate Cherenkov radio emission in a process known as the Askaryan effect. The optimal frequencywindow for observation of these pulses with radio telescopes on the Earth is around 150 MHz. Aims. By observing the Moon with the Westerbork Synthesis Radio Telescope array we are able to set a new limit on the UHEneutrino flux. Methods.… more
Date: April 2, 2010
Creator: Scholten, O.; Bacelar, J.; Braun, R.; de Bruyn, A.G.; Falcke, H.; Singh, K. et al.
Partner: UNT Libraries Government Documents Department
open access

VERTICAL PILLAR ARRAYS FOR PLASMON NANOCAVITIES

Description: We investigate tunable plasmon resonant cavity arrays in paired parallel nanowire waveguides. Resonances are observed when the waveguide length is an odd multiple of quarter plasmon wavelengths, consistent with boundary conditions of node and antinode at the ends. Two nanowire waveguides satisfy the dispersion relation of a planar metal-dielectric-metal waveguide of equivalent width equal to the square field average weighted gap. Confinement factors over 10{sup 3} are possible due to plasmon fo… more
Date: April 2, 2010
Creator: Bora, M.; Fasenfest, B. J.; Behymer, E. M.; Chang, A. S.; Hguyen, H. T.; Britten, J. A. et al.
Partner: UNT Libraries Government Documents Department
open access

Stardust and the Molecules of Life (Why are the Amino Acids Left-Handed?)

Description: A mechanism for creating and selecting amino acid chirality is identified, and subsequent chemical replication and galactic mixing that would populate the galaxy with the predominant species will be described. This involves: (1) the spin of the {sup 14}N in the amino acids, or in precursor molecules from which amino acids might be formed, coupling to the chirality of the molecules; (2) the neutrinos emitted from the supernova, together with magnetic field from the nascent neutron star or black … more
Date: April 2, 2010
Creator: Boyd, Richard N.; Kajino, Toshitaka & Onaka, Takashi
Partner: UNT Libraries Government Documents Department
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