Subthreshold antiproton production in pC, dC and $α$C reactions

Details Subthreshold antiproton production in pC, dC and $α$C reactions Subthreshold antiproton production in pC, dC and $α$C reactions

2004-02-03

arxiv.org/abs/nucl-th/0402009v2

J.Phys. G30 (2004) 1379-1390

Physics

Nuclear Physics

Nuclear Theory

11 pages, 3 figures, v2: Modification of text due to demands of referees

Scientific paper

10.1088/0954-3899/30/10/005

Data from KEK on subthreshold antiproton as well as on charged pion and kaon production in pC, dC and $\alpha$C reactions at energies between 3.5 and 12.0 A GeV are described for the first time within a unified approach. We use a model which considers a nuclear reaction as an incoherent sum over collisions of varying numbers of projectile and target nucleons. It samples complete events and thus allows for the simultaneous consideration of all final particles including the decay products of the nuclear residues. The enormous enhancement of the antiproton cross section as well as the moderate increase of meson production in dC and $\alpha$C compared to pC reactions is well reproduced. In our approach, the observed enhancement near the production threshold is mainly due to the contributions from the interactions of few-nucleon groups.

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