Fast deuteron production from antiproton annihilation at rest on carbon and uranium targets

Abstract

Abstract. Deuteron yields from 20-350 MeV kinetic energy in antiproton annihilation at rest in 12C and 238U targets are compared with a coalescence model calculation. Agreement of the data with the model up to approximately 80 MeV is good. However, from 80 to 350 MeV the model increasingly underestimates the yield, by as much as on order of magnitude. These results, along with previously reported failures to explain proton spectra with first order rescattering of pions, suggest that other mechanisms are manifest in relatively rare, high energy light nucleus emission, e.g. B > 0 annihilations or possible six quark interactions.

On studying charm in nuclei through antiproton annihilation

“…The detailed description of the initialization procedure as well as the interaction algorithm are given in Ref. [30].…”

“…The mean meson fields are calculated self-consistently by solving Eqs. ( 23) - (30) of Ref. [24], namely, by solving a set of coupled non-linear differential equations for static, spherically symmetric nuclei, resulting from the variation of the effective Lagrangian density involving the quark degrees of freedom and the scalar, vector and Coulomb fields in mean field approximation.…”

“…The D D production in antiproton-nucleus annihilation was calculated using the cascade model [30] adopted for pA simulations. The detailed description of the initialization procedure as well as the interaction algorithm are given in Ref.…”