2020 Impact factor 3.043
Hadrons and Nuclei
Eur. Phys. J. A 7, 293-298

On the Absorption of antibaryons in nuclei

M. Gonin - O. Hansen

Niels Bohr Institute for Astronomy, Physics and Geophysics, University of Copenhagen, 2100 Copenhagen, Denmark

Received: 15 July 1999 / Revised version: 10 November 1999 Communicated by P. Kienle

Abstract
Antiproton ($\bar{p}$) and antilambda ( $\bar{\Lambda }$) production has been measured for minimum bias in p+A collisions and central A1+A2 collisions at the CERN-SPS by the collaborations NA35/49 and NA44. The measurements are extrapolated from rapidity distributions to absolute minimum bias cross sections. It is shown that the $\bar{p}$cross sections divided by A$_{1}\cdot$A2 follow an exponential trend as a function of a characteristic length obtained from a Glauber type absorption model, while the $\bar{\Lambda }$ cross sections divided by A$_{1}\cdot$A2 are constant. The exponential trend also holds for $\bar{p}$ production at the lower energies of the Brookhaven AGS. A discussion of the physics interpretation of the established trends in terms of an effective absorption cross section is presented.

PACS
25.75.-q Relativistic heavy-ion collisions - 25.75.Dw Particle and resonance production


Copyright Società Italiana di Fisica, Springer-Verlag 2000