Antiproton Production Cross Sections Research Articles

Negative-kaon and antiproton production near 700 MeV/c by 28.4-GeV/c protons.

We present measurements of kaon and antiproton production cross sections in the momentum region of 700 MeV/c from 0/sup 0/ to 10/sup 0/ by 28.4-GeV/c protons on complex nuclei. A model to describe the A dependence of these cross sections is discussed and compared with these and other data.

Negative particle production at the CERN intersecting storage rings

Preliminary results on the production of negative particles in inclusive reactions at intermediate angles (80–200 mrad) at the CERN ISR are reported. Pion production is still the dominant process; within our experimental errors, scaling holds for negative pions or alternatively a limiting distribution is reached at relatively low energies. However the antiproton production cross-sections are apparently larger than smaller energies.

Experiments on Antiprotons: Cross Sections of Complex Nuclei

Experiments are described that have been designed to measure separately annihilation and reaction cross sections for antiprotons of approximately 450 Mev on oxygen, copper, silver, and lead. A new and more luminous spectrograph has been built for this experiment. The antiproton cross sections are compared with total proton cross sections, and are found to be larger by a factor varying from 1.74 for oxygen to 1.39 for silver. Calculations based on the optical model give a reasonable connection between these cross sections and the $\overline{p}\ensuremath{-}p$ and $\overline{p}\ensuremath{-}n$ cross sections. Finally, the information available on antiproton production cross sections is collected. There are indications that a free nucleon is several times as effective as a bound one for producing antiprotons.