This chapter is based on the work published in Physica Scripta, 42, 159,(1996))
Abstract:An analytical expression for ionization -excitation of He by high energy charged particles is formulated, using field theoretic technique. A comparative study of the differential cross sections with respect to the energy of the ejected electron for ionization-excitation of He to He+ (np) state by antiproton and equivelocity proton is presented. The ratio of the differential cross sections by antiproton to that by equivelocity proton is found to be greater than one for projectile velocity greater than the Bohr orbital velocity in He atom, and for ejected electron energy less than half the threshold energy for double ionization.
Angular differential cross-sections for the formation of H, as a result of electron capture by proton from He+(s) at the centre-of-mass energies from 4 to 24 keV, are calculated using distorted wave Coulomb-Born approximation. The total interaction potentials in the prior-iiiteraqtion channel and in the post-interaction channel are considered. Coulomb boundary conditions are taken care of with the proper choice of the perturbation potentials in both the prior and the post channels. A prior-post discrepancy is noted. Existing theoretical results are presented along with the present results.
Using a large directional water Cerenkov counter and a near horizontal magnetic spectrograph, the Cerenkov energy loss of relativistic muons has been studied. The experimental results, which cover the range of muon momentum 0.3-120 GeV/C, are consistent wit$ the classical theory of Frank and Tamm. They do not indicate a decrease in the Cerenkov loss, as expected according to Tsytovitch, nor do they confirm the large rise reported by Bassi et al.
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.