Production of cascade hypernuclei via the (K-,K+) reaction within a quark-meson coupling model

We study the production of bound cascade hypernuclei via the (K-,K+) reaction on 12C and 28Si targets within a covariant effective Lagrangian model, employing the cascade bound state spinors derived from the latest quark-meson coupling model as well as Dirac single particle wave functions. The K+-cascade production vertex is described by excitation, propagation and decay of Lambda and Sigma resonance states in the initial collision of a K- meson with a target proton in the incident channel. The parameters of the resonance vertices are fixed by describing the available data on total and differential cross sections for the cascade production in elementary (K-,K+) reaction. We find that both the elementary and hypernuclear production cross sections are dominated by the contributions from the Lambda(1520) intermediate resonant state. The 0 degree differential cross sections for the formation of simple s-state cascade particle-hole states peak at a beam momentum around 1.0 GeV/c, with a value in excess of 1 mub.Comment: 17 pages, 8 figures, version accepted for publication in Nucl. Phys.

Musique noire tous publics : la recette Motown

A multi-media entertainment concept as well as a record company, Motown was born in the socially transitional 50's. Its founder Berry Gordy was the intuitive entrepreneur capable of using his musical, social, and economic backgrounds to build a monumental cross-over business which, for the first time in history, unified the previously separate rhythm'n'blues and pop audiences on a massive scale. Purists find that this global breakthrough was completed at the expense of the black musical heritage and the African-American identity, not to mention the fact that culture ought not to be weighed in terms of dollars. But then, the Motown phenomenon can only be measured within the American context in which all enterprise, including culture, is valued « at the bottom line ».Knecht-Bechdolff Gabrielle. Musique noire tous publics : la recette Motown. In: Revue Française d'Etudes Américaines, N°60, mai 1994. La culture de masse aux Etats-Unis. pp. 193-200