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Reconstruction of Source and Cosmic Magnetic Field Characteristics from Clusters of Ultra-High Energy Cosmic Rays
Guenter Sigl, Martin Lemoine
We present a detailed Monte Carlo study coupled to a likelihood analysis of the potential of next generation ultra-high energy cosmic ray experiments to reconstruct properties of t…
A High Deuterium Abundance at z=0.7; Evidence for Cosmic Inhomogeneity?
J. K. Webb, R. F. Carswell, K. M. Lanzetta +3
Recent HST/GHRS observations of the z = 0.7010 absorber toward the QSO 1718+4807 (selected because of apparently ideal characteristics for measuring D/H) yield a D/H significantly…
A High Deuterium Abundance at z=0.7
J. K. Webb, R. F. Carswell, K. M. Lanzetta +4
Of the light elements, the primordial abundance of deuterium, (D/H)_p, provides the most sensitive diagnostic for the cosmological mass density parameter Omega_B. Recent high redsh…
Maximum Likelihood Analysis of Clusters of Ultra-High Energy Cosmic Rays
Guenter Sigl, Martin Lemoine, Angela V. Olinto
We present a numerical code designed to conduct a likelihood analysis for clusters of nucleons above 10**19 eV originating from discrete astrophysical sources such as powerful radi…
Ultra-high energy cosmic ray sources and large scale magnetic fields
Martin Lemoine, Guenter Sigl, Angela V. Olinto +1
Protons of energies up to 10**20 eV can be subject to significant deflection and energy dependent time delay in lage scale extragalactic or halo magnetic fields of strengths compar…
A very reduced upper limit on the interstellar abundance of beryllium
Guillaume Hébrard, Martin Lemoine, Roger Ferlet +1
We present the results of observations of the Åinterstellar absorption line of Be II in the direction of zeta Per. The data were obtained at the Canada-France-Hawaii 3.6m…