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We describe a scalable parallelization of Geant4 using commodity hardware in a collab-orative effort between the College of Computer Science and the Department of Physics at Northeastern University. The system consists of a Beowulf cluster of 32 Pentium II processors with 128 MBytes of memory each, connected via ATM and fast Ethernet. The bulk of the(More)
Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrated a correlation between the arrival directions of cosmic rays with energy above 6 x 10(19) electron volts and the positions of active galactic nuclei (AGN) lying within approximately 75 megaparsecs. We rejected the hypothesis of an isotropic distribution of these(More)
In this work we reexamine the opacity of the cosmic background radiation to the propagation of extremely high energy cosmic rays. We use the continuous energy loss approximation to provide spectral modification factors for several hypothesized cosmic ray sources. Earlier problems with this approximation are resolved including the effects of resonances other(More)
In nuclear physics, it is well known that the electromagnetic (Coulomb) interaction between final state products can drastically effect particle reaction rates. Near thresholds, for example, nuclear alpha decay is suppressed while nuclear beta decay is enhanced by final state Coulomb interactions. Here we discuss high energy physics enhancement and/or(More)
Results on the radiation hardness of photodiodes to fast neutrons are presented. Four photodiodes (three avalanche photodiodes from two manufacturers, and one PIN photodiode) were exposed to neutrons from a Cf source at Oak Ridge National Laboratory. The e!ects of this radiation on many parameters such as gain, intrinsic dark current, quantum e$ciency,(More)
We describe the modern trends in computing technologies in the context of Experimental High Energy Physics. For hardware we discuss the anticipated needs and estimated evolution of processing, data storage, and networking technologies and costs, while for software we describe the prevalent trend towards an Object-Oriented paradigm. INTRODUCTION The(More)
Editorial New year's greetings M. Mizuguchi (Japan) 1 Memorial Dr. Masaya Segawa, Japanese pioneer in child neurology K. Hoshino (Japan) 2 Review Articles Contributions of Japanese patients to development of antisense therapy for DMD Original Articles Pediatric epilepsy following neonatal seizures symptomatic of stroke (Italy) 27 Predictive factors for(More)
Alone in the crowd: How adults with learning difficulties cope with social networks problems Original Citation (1997) Alone in the crowd: How adults with learning difficulties cope with social networks problems. Users may access full items free of charge; copies of full text items generally can be reproduced, displayed or performed and given to third(More)