Triple-Pomeron Matrix Model for Dispersive Corrections to Nucleon-Nucleus Total Cross Section

Dispersive corrections to the total cross section for high-energy scattering from a heavy nucleus are calculated using a matrix model, based on the triple-Pomeron behavior of diffractive scattering from a single nucleon, for the cross section operator connecting different states of the projectile nucleon . Energy-dependent effects due to the decrease in longitudinal momentum transfers and the opening of more channels with increasing energy are included. The three leading terms in an expansion in the number of inelastic transitions are evaluated and compared to exact results for the model in the uniform nuclear density approximation for the the scattering of nucleons from Pb^{208} for laboratory momenta ranging from 50 to 200 GeV/c.Comment: 16 pages, 2 figures, RevTex

Production of Heavy Flavors In Nuclei At the Ares Facility

The recent proposal of the ARES facility, a single-pass electron-positron collider up to 15 GeV c.m. with high luminosity, opens the possibility of producing Λc+ (Λb)-hypernuclei by means of the charm (beauty) exchange reactions on nuclei. An estimation of the production cross-sections as well as experimental conditions and requirements are discussed

Annihilation cross-sections of antineutrons on C, Al, Cu, Sn and Pb at low momenta (180\u2013280 MeV/c) with the OBELIX spectrometer

Annihilation cross-sections sigma(ann) for antineutrons on some nuclei (C, Al, Cu, Sn and Pb) at three antineutron momenta (180, 240 and 280 MeV/c) were measured at LEAR (CERN) with the OBELIX spectrometer. A behaviour sigma(ann) = = sigma0A(nu) has been found with nu almost-equal-to 2/3. The data are discussed following some models for antineutron-nucleus interaction