Subthreshold antiproton production incollisions at 2.1 GeV/nucleon
- 17 April 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 62 (16) , 1829-1832
- https://doi.org/10.1103/physrevlett.62.1829
Abstract
We report on the first observation of subthreshold antiproton production in nucleus-nucleus collisions. This measurement was made for the system at a bombarding energy of 2.1 GeV/nucleon (kinetic energy per NN pair in the c.m. frame ∼850 MeV). A differential cross section σ/dP d Ω of 80±40 nb/sr (GeV/c) was measured for p¯ production at 1.9 GeV/c and 0°. This result is 3 orders of magnitude larger than that predicted by a calculation incorporating internal motion of the nucleons in the colliding nuclei.
Keywords
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