Production of charm mesons by high energy neutrons

The charmed mesons D"'±, DO, and D; have been observed in neutron-nucleus collisions at the FNAL Tevatron. A sample of 134 ± 19 events was investigated in the decay D"'±-+ D°1r± with the subsequent decay mode D°-+ K+ K-. The cross section per nucleon for D"'±, at most probable energy ...;s = 35 GeV, was measured to be: d:(xf) . BR = 2.11 ± .43 (±.63)JLb/nucleon Xf for 0.0 1r±. The differential cross section for D; production averaged over the particle and antiparticle states is: 1 (dO'(D+) dO'(D-») BR· "2 dx fS + dx / = 2.85 ± 0.80 ± .86 JLb/nucleon at x f = 0.175 where the first error is statistical and the second error is systematic. The branching fraction is defined as BR =BR(Ds -+ 4>n'), and a linear A dependence was assumed.U of I OnlyThesi

Space Weapons Earth Wars

This overview aims to inform the public discussion of space-based weapons by examining their characteristics, potential attributes, limitations, legality, and utility. The authors do not argue for or against space weapons, nor do they estimate the potential costs and performance of specific programs, but instead sort through the realities and myths surrounding space weapons in order to ensure that debates and discussions are based on fact

Nanotechnology in Medicine: Implications of converging technologies on humanity

Nanotechnology holds great potential as an enabler of a wide range of biotechnologies that will change the face of medicine and may eventually alter the very definition of human health. Deb Bennett-Woods argues that these changes will also pose unprecedented challenges regarding access to health-related technologies, the meaning of consent, and the nature of human identity. Development (2006) 49, 54–59. doi:10.1057/palgrave.development.1100297