Cross sections for K-p charge exchange, based on new data equal in statistics to the sum of those of all previous determinations below 300 MeV/c, are presented. The results confirm an earlier observation by this collaboration that the previous measurements of these cross sections at low momentum were significantly underestimated. Evidence for the presence of P wave scattering is presented.
Bubble chamber pictures have been scanned for the interactions of stopping K mesons in hydrogen. New déterminations of the ratios T,~n* K~p-»• charged partieles •y =-R = " K~p-S *jr~' *^ K~p-* ail final S tates for K~ meson interactions at rest, are presented, as well as the branching ratio ^ n;r^ Z+-> m t*, PTT" ' The values found for «g, 0.664 ± 0.011, and for B, 0.488 ± 0.008, are in agreement with previous results. On the other hand, two values, resulting from différent methods of analysis, have been found for 7, namely 2.38 + 0.04 and 2.35 ± 0.07. They agrée with one of the two previous précise measurements but are inconsistent with the other.
Results from an electrically addressed liquid-crystal cell producing continuous phase profiles are presented. The adaptive deflection of a beam of light for use in a tip-tilt adaptive optics system is demonstrated. We compare the optical performance of liquid-crystal prisms with experimental data on atmospheric seeing at the William Herschel Telescope.
We describe a binary approach to adaptive wave-front correction, especially suitable for narrow band applications, which would be simpler than conventional adaptive technology. Appropriate parts of the aberrant wave front are phase retarded by half a wavelength to ensure that none of the image-forming rays add together destructively. Simulations for monochromatic light show that the residual wave-front errors, in the absence of other errors, would result in Strehl ratios of ~40% with diffraction-limited widths at visible wavelengths. We simulate the imaging performance of such a system and describe a possible implementation that uses a ferroelectric liquid-crystal spatial light modulator.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.